diff --git a/src/base/BUILD.bazel b/src/base/BUILD.bazel
index 0d2c7cd61..e2546e1fb 100644
--- a/src/base/BUILD.bazel
+++ b/src/base/BUILD.bazel
@@ -144,6 +144,7 @@ mozc_cc_library(
     deps = [
         ":file_stream",
         "@com_google_absl//absl/base:core_headers",
+        "@com_google_absl//absl/log:initialize",
         "@com_google_absl//absl/log:log_entry",
         "@com_google_absl//absl/log:log_sink",
         "@com_google_absl//absl/log:log_sink_registry",
@@ -184,7 +185,6 @@ mozc_cc_test(
     name = "codegen_bytearray_stream_test",
     size = "small",
     srcs = ["codegen_bytearray_stream_test.cc"],
-    requires_full_emulation = False,
     tags = ["noandroid"],
     target_compatible_with = mozc_select(
         android = ["@platforms//:incompatible"],
@@ -211,7 +211,6 @@ mozc_cc_test(
     name = "singleton_test",
     size = "small",
     srcs = ["singleton_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":singleton",
         ":thread",
@@ -251,7 +250,6 @@ mozc_cc_library(
 mozc_cc_test(
     name = "hash_test",
     srcs = ["hash_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":hash",
         "//testing:gunit_main",
@@ -271,7 +269,6 @@ mozc_cc_library(
 mozc_cc_test(
     name = "clock_test",
     srcs = ["clock_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":clock",
         ":clock_mock",
@@ -325,7 +322,6 @@ mozc_cc_test(
     srcs = [
         "util_test.cc",
     ],
-    requires_full_emulation = False,
     deps = [
         ":logging",
         ":util",
@@ -366,7 +362,6 @@ mozc_cc_test(
     name = "number_util_test",
     size = "small",
     srcs = ["number_util_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":number_util",
         "//testing:gunit_main",
@@ -389,7 +384,6 @@ mozc_cc_test(
     name = "text_normalizer_test",
     size = "small",
     srcs = ["text_normalizer_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":text_normalizer",
         ":util",
@@ -415,7 +409,6 @@ mozc_cc_test(
     name = "clock_mock_test",
     size = "small",
     srcs = ["clock_mock_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":clock_mock",
         "//testing:gunit_main",
@@ -454,7 +447,6 @@ mozc_cc_test(
     name = "mmap_test",
     size = "small",
     srcs = ["mmap_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":file_util",
         ":mmap",
@@ -522,7 +514,6 @@ mozc_cc_test(
     name = "file_util_mock_test",
     size = "small",
     srcs = ["file_util_mock_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":file_util_mock",
         "//testing:gunit_main",
@@ -533,7 +524,6 @@ mozc_cc_test(
     name = "file_util_test",
     size = "small",
     srcs = ["file_util_test.cc"],
-    requires_full_emulation = False,
     tags = ["noandroid"],  # TODO(b/73698251): disabled due to errors
     deps = [
         ":file_util",
@@ -600,7 +590,6 @@ mozc_cc_library(
 mozc_cc_test(
     name = "system_util_test",
     srcs = ["system_util_test.cc"],
-    requires_full_emulation = False,
     visibility = ["//visibility:private"],
     deps = [
         ":environ_mock",
@@ -672,7 +661,6 @@ mozc_cc_test(
     name = "process_mutex_test",
     size = "small",
     srcs = ["process_mutex_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":file_util",
         ":logging",
@@ -748,7 +736,6 @@ mozc_cc_test(
     name = "config_file_stream_test",
     size = "small",
     srcs = ["config_file_stream_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":config_file_stream",
         ":file_util",
@@ -819,7 +806,6 @@ mozc_cc_test(
     name = "version_test",
     size = "small",
     srcs = ["version_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":util",
         ":version",
@@ -857,7 +843,6 @@ mozc_cc_test(
         "unverified_aes256_test.cc",
         "unverified_sha1_test.cc",
     ],
-    requires_full_emulation = False,
     visibility = ["//visibility:private"],
     deps = [
         ":obfuscator_support",
@@ -909,7 +894,6 @@ mozc_cc_test(
         "encryptor_test.cc",
         "password_manager_test.cc",
     ],
-    requires_full_emulation = False,
     # Skipped for Windows Presubmit as CryptProtectData doesn't work on a headless Windows VM.
     # Background: https://github.com/Azure/azure-cli/issues/20695#issuecomment-992086316
     tags = ["nowin"],
@@ -934,7 +918,6 @@ mozc_cc_test(
     name = "cpu_stats_test",
     size = "small",
     srcs = ["cpu_stats_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":cpu_stats",
         "//testing:gunit_main",
@@ -970,7 +953,6 @@ mozc_cc_test(
     name = "stopwatch_test",
     size = "small",
     srcs = ["stopwatch_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":clock",
         ":clock_mock",
@@ -1006,7 +988,6 @@ mozc_cc_test(
     name = "url_test",
     size = "small",
     srcs = ["url_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":url",
         "//testing:gunit_main",
@@ -1031,7 +1012,6 @@ mozc_cc_test(
     name = "multifile_test",
     size = "small",
     srcs = ["multifile_test.cc"],
-    requires_full_emulation = False,
     tags = ["noandroid"],  # TODO(b/73698251): disabled due to errors
     deps = [
         ":file_stream",
@@ -1086,7 +1066,6 @@ mozc_cc_test(
         ":gen_embedded_file_test_data",
     ],
     data = ["embedded_file.h"],
-    requires_full_emulation = False,
     tags = ["noandroid"],  # TODO(b/73698251): disabled due to errors
     deps = [
         ":embedded_file",
diff --git a/src/base/container/BUILD.bazel b/src/base/container/BUILD.bazel
index 0d491254c..64f40290d 100644
--- a/src/base/container/BUILD.bazel
+++ b/src/base/container/BUILD.bazel
@@ -46,7 +46,6 @@ mozc_cc_test(
     name = "bitarray_test",
     size = "small",
     srcs = ["bitarray_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":bitarray",
         "//testing:gunit_main",
@@ -88,7 +87,6 @@ mozc_cc_test(
     name = "serialized_string_array_test",
     size = "small",
     srcs = ["serialized_string_array_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":serialized_string_array",
         "//testing:gunit_main",
@@ -112,7 +110,6 @@ mozc_cc_test(
     name = "trie_test",
     size = "small",
     srcs = ["trie_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":trie",
         "//testing:gunit_main",
diff --git a/src/base/log_file.cc b/src/base/log_file.cc
index 29cb38b74..997ca7a65 100644
--- a/src/base/log_file.cc
+++ b/src/base/log_file.cc
@@ -32,6 +32,7 @@
 #include <string>
 
 #include "absl/base/thread_annotations.h"
+#include "absl/log/initialize.h"
 #include "absl/log/log_entry.h"
 #include "absl/log/log_sink.h"
 #include "absl/log/log_sink_registry.h"
@@ -64,6 +65,7 @@ class LogFileSink : public absl::LogSink {
 
 void RegisterLogFileSink(const std::string &path) {
 #if !defined(MOZC_NO_LOGGING) && !defined(__ANDROID__)
+  absl::InitializeLog();
   absl::AddLogSink(new LogFileSink(path));
 #endif  // !MOZC_NO_LOGGING && !__ANDROID__
 }
diff --git a/src/base/strings/BUILD.bazel b/src/base/strings/BUILD.bazel
index 8de72b805..8233d69f1 100644
--- a/src/base/strings/BUILD.bazel
+++ b/src/base/strings/BUILD.bazel
@@ -124,7 +124,6 @@ mozc_cc_test(
     srcs = [
         "japanese_test.cc",
     ],
-    requires_full_emulation = False,
     deps = [
         ":japanese",
         "//testing:gunit_main",
diff --git a/src/base/strings/unicode.h b/src/base/strings/unicode.h
index d61e503c9..df71f0504 100644
--- a/src/base/strings/unicode.h
+++ b/src/base/strings/unicode.h
@@ -144,16 +144,34 @@ absl::string_view Utf8Substring(absl::string_view sv, size_t pos, size_t count);
 
 }  // namespace strings
 
+// Represents both a UTF-8 string and its decoded result.
+class UnicodeChar {
+ public:
+  UnicodeChar(const char* utf8, const uint_fast8_t bytes_seen,
+              char32_t codepoint)
+      : utf8_(utf8),
+        dr_(utf8_internal::DecodeResult::Continue(codepoint, bytes_seen)) {}
+
+  char32_t char32() const { return dr_.code_point(); }
+  absl::string_view utf8() const {
+    return absl::string_view(utf8_, dr_.bytes_seen());
+  }
+
+ private:
+  const char* utf8_;
+  utf8_internal::DecodeResult dr_;
+};
+
 // Utf8CharIterator is an iterator adapter for a string-like iterator to iterate
 // over each UTF-8 character.
 // Note that the simple dereference returns the underlying StringIterator value.
 // Use one of the member functions to access each character.
-template <bool AsChar32>
+template <typename ValueType>
 class Utf8CharIterator {
  public:
   using difference_type =
       typename std::iterator_traits<const char*>::difference_type;
-  using value_type = std::conditional_t<AsChar32, char32_t, absl::string_view>;
+  using value_type = ValueType;
   using pointer = const value_type*;
   // The reference type can be non-reference for input iterators.
   using reference = value_type;
@@ -173,10 +191,12 @@ class Utf8CharIterator {
 
   // Returns the current character.
   reference operator*() const {
-    if constexpr (AsChar32) {
+    if constexpr (std::is_same_v<ValueType, char32_t>) {
       return char32();
-    } else {
+    } else if constexpr (std::is_same_v<ValueType, absl::string_view>) {
       return view();
+    } else if constexpr (std::is_same_v<ValueType, UnicodeChar>) {
+      return ValueType{ptr_, dr_.bytes_seen(), dr_.code_point()};
     }
   }
 
@@ -218,9 +238,9 @@ class Utf8CharIterator {
   // another iterator last.
   //
   // REQUIRES: last points to the same string object.
-  template <bool AsChar32Last>
+  template <typename LastValueType>
   absl::string_view SubstringTo(
-      const Utf8CharIterator<AsChar32Last> last) const {
+      const Utf8CharIterator<LastValueType> last) const {
     return absl::string_view(ptr_, last.ptr_ - ptr_);
   }
 
@@ -238,14 +258,14 @@ class Utf8CharIterator {
 };
 
 // Comparison operators for Utf8CharIterator.
-template <bool AsChar32L, bool AsChar32R>
-bool operator==(const Utf8CharIterator<AsChar32L> lhs,
-                const Utf8CharIterator<AsChar32R> rhs) {
+template <typename TLhs, typename TRhs>
+bool operator==(const Utf8CharIterator<TLhs> lhs,
+                const Utf8CharIterator<TRhs> rhs) {
   return lhs.to_address() == rhs.to_address();
 }
-template <bool AsChar32L, bool AsChar32R>
-bool operator!=(const Utf8CharIterator<AsChar32L> lhs,
-                const Utf8CharIterator<AsChar32R> rhs) {
+template <typename TLhs, typename TRhs>
+bool operator!=(const Utf8CharIterator<TLhs> lhs,
+                const Utf8CharIterator<TRhs> rhs) {
   return !(lhs == rhs);
 }
 
@@ -261,16 +281,16 @@ bool operator!=(const Utf8CharIterator<AsChar32L> lhs,
 // size, however, this class will mostly be used to just iterate over each
 // character once, so it'd be inefficient to iterate over the same string twice.
 // Therefore, it doesn't have the size() member function.
-template <bool AsChar32>
+template <typename ValueType>
 class Utf8AsCharsBase {
  public:
   using StringViewT = absl::string_view;
   using CharT = StringViewT::value_type;
 
-  using value_type = std::conditional_t<AsChar32, char32_t, absl::string_view>;
+  using value_type = ValueType;
   using reference = value_type&;
   using const_reference = const value_type&;
-  using iterator = Utf8CharIterator<AsChar32>;
+  using iterator = Utf8CharIterator<ValueType>;
   using const_iterator = iterator;
   using difference_type = StringViewT::difference_type;
   using size_type = StringViewT::size_type;
@@ -295,9 +315,9 @@ class Utf8AsCharsBase {
   // can be different among first, last, and the constructed class.
   //
   // Complexity: constant
-  template <bool AsChar32First, bool AsChar32Last>
-  Utf8AsCharsBase(const Utf8CharIterator<AsChar32First> first,
-                  const Utf8CharIterator<AsChar32Last> last)
+  template <typename TFirst, typename TLast>
+  Utf8AsCharsBase(const Utf8CharIterator<TFirst> first,
+                  const Utf8CharIterator<TLast> last)
       : sv_(first.to_address(), last.to_address() - first.to_address()) {}
 
   // Construction from a null pointer is disallowed.
@@ -339,13 +359,13 @@ class Utf8AsCharsBase {
   // complexity.
   //
   // Complexity: constant
-  template <bool AsChar32First>
-  StringViewT Substring(const Utf8CharIterator<AsChar32First> first) const {
+  template <typename TFirst>
+  StringViewT Substring(const Utf8CharIterator<TFirst> first) const {
     return first.SubstringTo(end());
   }
-  template <bool AsChar32First, bool AsChar32Last>
-  StringViewT Substring(const Utf8CharIterator<AsChar32First> first,
-                        const Utf8CharIterator<AsChar32Last> last) const {
+  template <typename TFirst, typename TLast>
+  StringViewT Substring(const Utf8CharIterator<TFirst> first,
+                        const Utf8CharIterator<TLast> last) const {
     return first.SubstringTo(last);
   }
 
@@ -364,34 +384,34 @@ class Utf8AsCharsBase {
 
 // Bitwise comparison operators that compare two Utf8AsCharBase using the
 // underlying string_view comparators.
-template <bool AsChar32L, bool AsChar32R>
-bool operator==(const Utf8AsCharsBase<AsChar32L> lhs,
-                const Utf8AsCharsBase<AsChar32R> rhs) {
+template <typename TLhs, typename TRhs>
+bool operator==(const Utf8AsCharsBase<TLhs> lhs,
+                const Utf8AsCharsBase<TRhs> rhs) {
   return lhs.view() == rhs.view();
 }
-template <bool AsChar32L, bool AsChar32R>
-bool operator!=(const Utf8AsCharsBase<AsChar32L> lhs,
-                const Utf8AsCharsBase<AsChar32R> rhs) {
+template <typename TLhs, typename TRhs>
+bool operator!=(const Utf8AsCharsBase<TLhs> lhs,
+                const Utf8AsCharsBase<TRhs> rhs) {
   return lhs.view() != rhs.view();
 }
-template <bool AsChar32L, bool AsChar32R>
-bool operator<(const Utf8AsCharsBase<AsChar32L> lhs,
-               const Utf8AsCharsBase<AsChar32R> rhs) {
+template <typename TLhs, typename TRhs>
+bool operator<(const Utf8AsCharsBase<TLhs> lhs,
+               const Utf8AsCharsBase<TRhs> rhs) {
   return lhs.view() < rhs.view();
 }
-template <bool AsChar32L, bool AsChar32R>
-bool operator<=(const Utf8AsCharsBase<AsChar32L> lhs,
-                const Utf8AsCharsBase<AsChar32R> rhs) {
+template <typename TLhs, typename TRhs>
+bool operator<=(const Utf8AsCharsBase<TLhs> lhs,
+                const Utf8AsCharsBase<TRhs> rhs) {
   return lhs.view() <= rhs.view();
 }
-template <bool AsChar32L, bool AsChar32R>
-bool operator>=(const Utf8AsCharsBase<AsChar32L> lhs,
-                const Utf8AsCharsBase<AsChar32R> rhs) {
+template <typename TLhs, typename TRhs>
+bool operator>=(const Utf8AsCharsBase<TLhs> lhs,
+                const Utf8AsCharsBase<TRhs> rhs) {
   return lhs.view() >= rhs.view();
 }
-template <bool AsChar32L, bool AsChar32R>
-bool operator>(const Utf8AsCharsBase<AsChar32L> lhs,
-               const Utf8AsCharsBase<AsChar32R> rhs) {
+template <typename TLhs, typename TRhs>
+bool operator>(const Utf8AsCharsBase<TLhs> lhs,
+               const Utf8AsCharsBase<TRhs> rhs) {
   return lhs.view() > rhs.view();
 }
 
@@ -413,7 +433,7 @@ bool operator>(const Utf8AsCharsBase<AsChar32L> lhs,
 //  std::vector<char32_t> v;
 //  absl::c_copy(Utf8AsChars32(sv), std::back_inserter(s32));
 //  absl::c_copy(Utf8AsChars32(sv), std::back_inserter(v));
-using Utf8AsChars32 = Utf8AsCharsBase<true>;
+using Utf8AsChars32 = Utf8AsCharsBase<char32_t>;
 
 // Utf8AsChars is a wrapper to iterator a UTF-8 string over each character as
 // substrings. Characters with invalid encodings are returned as they are.
@@ -430,7 +450,21 @@ using Utf8AsChars32 = Utf8AsCharsBase<true>;
 // const absl::string_view sv = ...;
 // std::vector<absl::string_view> v;
 // absl::c_copy(Utf8AsChars(sv), std::back_inserter(v));
-using Utf8AsChars = Utf8AsCharsBase<false>;
+using Utf8AsChars = Utf8AsCharsBase<absl::string_view>;
+
+// Utf8AsUnicodeChar is similar to Utf8AsChars32 and Utf8AsChars above, except
+// that it can provide both char32_t code points and its UTF-8 sub-strings.
+//
+// When both aren't needed, Utf8AsChars32 and Utf8AsChars are more efficient.
+//
+// Example:
+//  bool Func(const absl::string_view sv) {
+//    for (const UnicodeChar c : Utf8AsUnicodeChar(sv)) {
+//      std::cout << c.utf8() >> " --> " << c.char32();
+//    }
+//    ...
+//  }
+using Utf8AsUnicodeChar = Utf8AsCharsBase<UnicodeChar>;
 
 // Implementations.
 namespace strings {
@@ -467,16 +501,18 @@ constexpr std::pair<absl::string_view, absl::string_view> FrontChar(
 
 }  // namespace strings
 
-template <bool AsChar32>
-typename Utf8AsCharsBase<AsChar32>::value_type Utf8AsCharsBase<AsChar32>::back()
-    const {
+template <typename ValueType>
+typename Utf8AsCharsBase<ValueType>::value_type
+Utf8AsCharsBase<ValueType>::back() const {
   const char* const last = EndPtr();
   if (sv_.back() <= 0x7f) {
     // ASCII
-    if constexpr (AsChar32) {
+    if constexpr (std::is_same_v<ValueType, char32_t>) {
       return sv_.back();
-    } else {
+    } else if constexpr (std::is_same_v<ValueType, absl::string_view>) {
       return value_type(last - 1, 1);
+    } else if constexpr (std::is_same_v<ValueType, UnicodeChar>) {
+      return value_type{last - 1, 1, sv_.back()};
     }
   }
   // Other patterns. UTF-8 characters are at most four bytes long.
@@ -487,10 +523,12 @@ typename Utf8AsCharsBase<AsChar32>::value_type Utf8AsCharsBase<AsChar32>::back()
       const char* const ptr = last - size;
       const utf8_internal::DecodeResult dr = utf8_internal::Decode(ptr, last);
       if (dr.bytes_seen() == size) {
-        if constexpr (AsChar32) {
+        if constexpr (std::is_same_v<ValueType, char32_t>) {
           return dr.code_point();
-        } else {
+        } else if constexpr (std::is_same_v<ValueType, absl::string_view>) {
           return value_type(ptr, dr.bytes_seen());
+        } else if constexpr (std::is_same_v<ValueType, UnicodeChar>) {
+          return value_type{ptr, dr.bytes_seen(), dr.code_point()};
         }
       }
     }
diff --git a/src/base/strings/unicode_test.cc b/src/base/strings/unicode_test.cc
index a53445771..49c6cabae 100644
--- a/src/base/strings/unicode_test.cc
+++ b/src/base/strings/unicode_test.cc
@@ -314,6 +314,24 @@ TEST_P(Utf8AsCharsTest, AsString) {
   EXPECT_EQ(actual, GetParam().u8_strings);
 }
 
+TEST_P(Utf8AsCharsTest, AsUnicodeChar) {
+  const Utf8AsUnicodeChar s(GetParam().input);
+  std::u32string actual_u32;
+  std::vector<absl::string_view> actual_string_views;
+  for (const UnicodeChar data : s) {
+    actual_u32.push_back(data.char32());
+    actual_string_views.push_back(data.utf8());
+  }
+  EXPECT_EQ(actual_u32, GetParam().chars32);
+  EXPECT_EQ(actual_string_views, GetParam().u8_strings);
+  if (!s.empty()) {
+    EXPECT_EQ(s.front().char32(), GetParam().chars32.front());
+    EXPECT_EQ(s.front().utf8(), GetParam().u8_strings.front());
+    EXPECT_EQ(s.back().char32(), GetParam().chars32.back());
+    EXPECT_EQ(s.back().utf8(), GetParam().u8_strings.back());
+  }
+}
+
 TEST_P(Utf8AsCharsTest, Properties) {
   const Utf8AsChars32 s(GetParam().input);
   const absl::string_view input = GetParam().input;
diff --git a/src/build_defs.bzl b/src/build_defs.bzl
index 88b21f2bd..33ae6e427 100644
--- a/src/build_defs.bzl
+++ b/src/build_defs.bzl
@@ -70,7 +70,7 @@ def mozc_cc_library(deps = [], copts = [], visibility = None, **kwargs):
     )
 
 register_extension_info(
-    extension = "mozc_cc_library",
+    extension = mozc_cc_library,
     label_regex_for_dep = "{extension_name}",
 )
 
@@ -85,7 +85,7 @@ def mozc_cc_binary(deps = [], copts = [], **kwargs):
     )
 
 register_extension_info(
-    extension = "mozc_cc_binary",
+    extension = mozc_cc_binary,
     label_regex_for_dep = "{extension_name}",
 )
 
@@ -99,8 +99,6 @@ def mozc_cc_test(name, tags = [], deps = [], copts = [], **kwargs):
       copts: copts for cc_test.  -funsigned-char is added.
       **kwargs: other args for cc_test.
     """
-
-    requires_full_emulation = kwargs.pop("requires_full_emulation", False)
     native.cc_test(
         name = name,
         tags = tags,
@@ -110,7 +108,7 @@ def mozc_cc_test(name, tags = [], deps = [], copts = [], **kwargs):
     )
 
 register_extension_info(
-    extension = "mozc_cc_test",
+    extension = mozc_cc_test,
     label_regex_for_dep = "{extension_name}",
 )
 
@@ -124,7 +122,7 @@ def mozc_py_library(name, srcs, srcs_version = "PY3", **kwargs):
     )
 
 register_extension_info(
-    extension = "mozc_py_library",
+    extension = mozc_py_library,
     label_regex_for_dep = "{extension_name}",
 )
 
@@ -147,7 +145,7 @@ def mozc_py_binary(name, srcs, python_version = "PY3", srcs_version = "PY3", tes
     )
 
 register_extension_info(
-    extension = "mozc_py_binary",
+    extension = mozc_py_binary,
     label_regex_for_dep = "{extension_name}",
 )
 
@@ -210,7 +208,7 @@ def mozc_objc_library(
     )
 
 register_extension_info(
-    extension = "mozc_objc_library",
+    extension = mozc_objc_library,
     label_regex_for_dep = "{extension_name}",
 )
 
@@ -268,7 +266,7 @@ def mozc_objc_test(
     )
 
 register_extension_info(
-    extension = "mozc_objc_test",
+    extension = mozc_objc_test,
     label_regex_for_dep = "{extension_name}",
 )
 
@@ -392,6 +390,11 @@ def mozc_select(
       oss_android: value for OSS Android build.
       oss_linux: value for OSS Linux build.
       oss_macos: value for OSS macOS build.
+      oss_windows: value for OSS Windows build.
+      prod: value for prod build.
+      prod_linux: value for prod Linux build.
+      prod_macos: value for prod macOS build.
+      prod_windows: value for prod Windows build.
       wasm: value for wasm build.
       windows: value for Windows build. (placeholder)
 
diff --git a/src/client/BUILD.bazel b/src/client/BUILD.bazel
index 87137a8fb..ccf9b3c81 100644
--- a/src/client/BUILD.bazel
+++ b/src/client/BUILD.bazel
@@ -110,7 +110,6 @@ mozc_cc_test(
     name = "client_test",
     size = "small",
     srcs = ["client_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":client",
         ":client_interface",
diff --git a/src/composer/BUILD.bazel b/src/composer/BUILD.bazel
index 995646543..b163626fa 100644
--- a/src/composer/BUILD.bazel
+++ b/src/composer/BUILD.bazel
@@ -77,7 +77,6 @@ mozc_cc_test(
     name = "composer_test",
     size = "small",
     srcs = ["composer_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":composer",
         ":key_parser",
@@ -133,7 +132,6 @@ mozc_cc_test(
     name = "table_test",
     size = "small",
     srcs = ["table_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":table",
         "//composer/internal:special_key",
@@ -152,8 +150,9 @@ mozc_cc_library(
     srcs = ["key_event_util.cc"],
     hdrs = ["key_event_util.h"],
     deps = [
-        "//base:logging",
         "//protocol:commands_cc_proto",
+        "@com_google_absl//absl/log",
+        "@com_google_absl//absl/log:check",
     ],
 )
 
@@ -161,7 +160,6 @@ mozc_cc_test(
     name = "key_event_util_test",
     size = "small",
     srcs = ["key_event_util_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":key_event_util",
         ":key_parser",
@@ -193,7 +191,6 @@ mozc_cc_test(
     name = "key_parser_test",
     size = "small",
     srcs = ["key_parser_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":key_event_util",
         ":key_parser",
diff --git a/src/composer/internal/BUILD.bazel b/src/composer/internal/BUILD.bazel
index 283a02c09..d07105cb5 100644
--- a/src/composer/internal/BUILD.bazel
+++ b/src/composer/internal/BUILD.bazel
@@ -96,7 +96,6 @@ mozc_cc_test(
     srcs = [
         "transliterators_test.cc",
     ],
-    requires_full_emulation = False,
     deps = [
         ":transliterator_interface",
         ":transliterators",
@@ -110,7 +109,6 @@ mozc_cc_test(
     srcs = [
         "char_chunk_test.cc",
     ],
-    requires_full_emulation = False,
     deps = [
         ":char_chunk",
         ":composition_input",
@@ -144,7 +142,6 @@ mozc_cc_test(
     srcs = [
         "composition_input_test.cc",
     ],
-    requires_full_emulation = False,
     deps = [
         ":composition_input",
         "//composer:table",
@@ -179,7 +176,6 @@ mozc_cc_test(
     srcs = [
         "composition_test.cc",
     ],
-    requires_full_emulation = False,
     deps = [
         ":char_chunk",
         ":composition",
@@ -217,7 +213,6 @@ mozc_cc_test(
     name = "converter_test",
     size = "small",
     srcs = ["converter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":converter",
         "//composer:table",
@@ -240,7 +235,6 @@ mozc_cc_test(
     name = "mode_switching_handler_test",
     size = "small",
     srcs = ["mode_switching_handler_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":mode_switching_handler",
         "//testing:gunit_main",
diff --git a/src/composer/key_event_util.cc b/src/composer/key_event_util.cc
index e58bb61de..07adfed29 100644
--- a/src/composer/key_event_util.cc
+++ b/src/composer/key_event_util.cc
@@ -33,7 +33,8 @@
 #include <cstddef>
 #include <cstdint>
 
-#include "base/logging.h"
+#include "absl/log/check.h"
+#include "absl/log/log.h"
 #include "protocol/commands.pb.h"
 
 namespace mozc {
@@ -85,7 +86,7 @@ bool KeyEventUtil::GetKeyInformation(const KeyEvent &key_event,
                                    : KeyEvent::NO_SPECIALKEY;
   const uint32_t key_code = key_event.has_key_code() ? key_event.key_code() : 0;
 
-  // Make sure the translation from the obsolete spesification.
+  // Make sure the translation from the obsolete specification.
   // key_code should no longer contain control characters.
   if (0 < key_code && key_code <= 32) {
     return false;
@@ -173,7 +174,7 @@ void KeyEventUtil::NormalizeNumpadKey(const KeyEvent &key_event,
       new_key_code = ',';
       break;
     default:
-      LOG(ERROR) << "Should not reach here.";
+      LOG(ERROR) << "Unexpected numpad key: " << numpad_key;
       return;
   }
 
diff --git a/src/config/BUILD.bazel b/src/config/BUILD.bazel
index fa68352d8..291bd30e0 100644
--- a/src/config/BUILD.bazel
+++ b/src/config/BUILD.bazel
@@ -65,7 +65,6 @@ mozc_cc_test(
     size = "small",
     srcs = ["config_handler_test.cc"],
     data = ["//data/test/config:config_test_data"],
-    requires_full_emulation = False,
     deps = [
         ":config_handler",
         "//base:clock",
@@ -107,7 +106,6 @@ mozc_cc_test(
     name = "stats_config_util_test",
     size = "small",
     srcs = ["stats_config_util_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":config_handler",
         ":stats_config_util",
@@ -159,7 +157,6 @@ mozc_cc_test(
     name = "character_form_manager_test",
     size = "large",
     srcs = ["character_form_manager_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":character_form_manager",
         "//protocol:config_cc_proto",
diff --git a/src/converter/BUILD.bazel b/src/converter/BUILD.bazel
index 96a1a100d..966f7c304 100644
--- a/src/converter/BUILD.bazel
+++ b/src/converter/BUILD.bazel
@@ -65,7 +65,6 @@ mozc_cc_test(
     name = "segments_test",
     size = "small",
     srcs = ["segments_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":segments",
         "//base:number_util",
@@ -160,7 +159,6 @@ mozc_cc_test(
         "//data/test/dictionary:connection_single_column.txt",
         "//data_manager/testing:mozc_dataset_for_testing@connection",
     ],
-    requires_full_emulation = False,
     deps = [
         ":connector",
         "//base:logging",
@@ -201,7 +199,6 @@ mozc_cc_test(
     srcs = [
         "nbest_generator_test.cc",
     ],
-    requires_full_emulation = False,
     deps = [
         ":connector",
         ":immutable_converter_no_factory",
@@ -250,7 +247,6 @@ mozc_cc_test(
     name = "candidate_filter_test",
     size = "small",
     srcs = ["candidate_filter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":candidate_filter",
         ":node",
@@ -303,7 +299,6 @@ mozc_cc_test(
     name = "lattice_test",
     size = "small",
     srcs = ["lattice_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":lattice",
         ":node",
@@ -374,7 +369,6 @@ mozc_cc_test(
     srcs = [
         "immutable_converter_test.cc",
     ],
-    requires_full_emulation = False,
     deps = [
         ":immutable_converter_no_factory",
         ":lattice",
@@ -449,7 +443,6 @@ mozc_cc_test(
     size = "small",
     timeout = "moderate",
     srcs = ["converter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":converter",
         ":converter_interface",
@@ -499,7 +492,6 @@ mozc_cc_test(
     name = "converter_regression_test",
     size = "medium",
     srcs = ["converter_regression_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":converter_interface",
         ":segments",
@@ -533,7 +525,6 @@ mozc_cc_test(
     size = "small",
     srcs = ["pos_id_printer_test.cc"],
     data = ["//data/test/dictionary:id.def"],
-    requires_full_emulation = False,
     deps = [
         ":pos_id_printer",
         "//base:file_stream",
@@ -632,7 +623,6 @@ mozc_cc_test(
     name = "key_corrector_test",
     size = "small",
     srcs = ["key_corrector_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":key_corrector",
         "//testing:gunit_main",
diff --git a/src/converter/converter.cc b/src/converter/converter.cc
index f3d43af43..53b427df7 100644
--- a/src/converter/converter.cc
+++ b/src/converter/converter.cc
@@ -37,6 +37,7 @@
 #include <utility>
 #include <vector>
 
+#include "absl/base/optimization.h"
 #include "absl/log/check.h"
 #include "absl/log/log.h"
 #include "absl/strings/string_view.h"
@@ -292,7 +293,7 @@ bool Converter::StartConversion(const ConversionRequest &original_request,
       conversion_key = request.composer().GetQueryForPrediction();
       break;
     default:
-      LOG(FATAL) << "Should never reach here";
+      ABSL_UNREACHABLE();
   }
   if (conversion_key.empty()) {
     return false;
diff --git a/src/data_manager/BUILD.bazel b/src/data_manager/BUILD.bazel
index c1c2bf238..0a2af6e9f 100644
--- a/src/data_manager/BUILD.bazel
+++ b/src/data_manager/BUILD.bazel
@@ -164,7 +164,6 @@ mozc_cc_library(
 mozc_cc_test(
     name = "dataset_writer_test",
     srcs = ["dataset_writer_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":dataset_cc_proto",
         ":dataset_writer",
@@ -215,7 +214,6 @@ mozc_cc_library(
 mozc_cc_test(
     name = "dataset_reader_test",
     srcs = ["dataset_reader_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":dataset_cc_proto",
         ":dataset_reader",
@@ -265,7 +263,6 @@ mozc_cc_library(
 mozc_cc_test(
     name = "serialized_dictionary_test",
     srcs = ["serialized_dictionary_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":serialized_dictionary",
         "//base/container:serialized_string_array",
diff --git a/src/data_manager/oss/BUILD.bazel b/src/data_manager/oss/BUILD.bazel
index a4d43a992..f76d1413d 100644
--- a/src/data_manager/oss/BUILD.bazel
+++ b/src/data_manager/oss/BUILD.bazel
@@ -137,7 +137,6 @@ mozc_cc_test(
         "//data/dictionary_oss:connection_single_column.txt",
         "//data/dictionary_oss:suggestion_filter.txt",
     ],
-    requires_full_emulation = False,
     deps = [
         ":oss_data_manager",
         "//data_manager:data_manager_test_base",
diff --git a/src/data_manager/testing/BUILD.bazel b/src/data_manager/testing/BUILD.bazel
index 83ebe3f44..141e218d3 100644
--- a/src/data_manager/testing/BUILD.bazel
+++ b/src/data_manager/testing/BUILD.bazel
@@ -75,7 +75,6 @@ mozc_cc_test(
         "//data/test/dictionary:dictionary_data",
         "//data/test/dictionary:suggestion_filter.txt",
     ],
-    requires_full_emulation = False,
     deps = [
         ":mock_data_manager",
         "//data_manager:data_manager_test_base",
diff --git a/src/dictionary/BUILD.bazel b/src/dictionary/BUILD.bazel
index 3b3a4c2af..2ee410963 100644
--- a/src/dictionary/BUILD.bazel
+++ b/src/dictionary/BUILD.bazel
@@ -70,7 +70,6 @@ mozc_cc_test(
     name = "dictionary_impl_test",
     size = "small",
     srcs = ["dictionary_impl_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":dictionary_impl",
         ":dictionary_interface",
@@ -170,7 +169,6 @@ mozc_cc_test(
     srcs = [
         "user_dictionary_test.cc",
     ],
-    requires_full_emulation = False,
     deps = [
         ":dictionary_interface",
         ":dictionary_test_util",
@@ -279,6 +277,7 @@ mozc_cc_library(
         "//base/protobuf:repeated_field",
         "//base/strings:assign",
         "//protocol:user_dictionary_storage_cc_proto",
+        "@com_google_absl//absl/base:core_headers",
         "@com_google_absl//absl/container:fixed_array",
         "@com_google_absl//absl/strings",
     ],
@@ -288,7 +287,6 @@ mozc_cc_test(
     name = "user_dictionary_session_test",
     size = "medium",
     srcs = ["user_dictionary_session_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":user_dictionary_session",
         ":user_dictionary_storage",
@@ -322,7 +320,6 @@ mozc_cc_test(
     name = "user_dictionary_session_handler_test",
     size = "small",
     srcs = ["user_dictionary_session_handler_test.cc"],
-    requires_full_emulation = True,
     deps = [
         ":user_dictionary_session_handler",
         "//base:file_util",
@@ -350,6 +347,7 @@ mozc_cc_library(
         "//base:vlog",
         "//base/protobuf:zero_copy_stream_impl",
         "//protocol:user_dictionary_storage_cc_proto",
+        "@com_google_absl//absl/base:core_headers",
         "@com_google_absl//absl/status",
         "@com_google_absl//absl/strings",
         "@com_google_absl//absl/strings:str_format",
@@ -361,7 +359,6 @@ mozc_cc_test(
     name = "user_dictionary_storage_test",
     size = "small",
     srcs = ["user_dictionary_storage_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":user_dictionary_importer",
         ":user_dictionary_storage",
@@ -406,7 +403,6 @@ mozc_cc_test(
     name = "user_dictionary_util_test",
     size = "small",
     srcs = ["user_dictionary_util_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":user_dictionary_util",
         "//testing:gunit_main",
@@ -442,7 +438,6 @@ mozc_cc_test(
     name = "user_dictionary_importer_test",
     size = "small",
     srcs = ["user_dictionary_importer_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":user_dictionary_importer",
         ":user_dictionary_storage",
@@ -480,7 +475,6 @@ mozc_cc_test(
     srcs = [
         "text_dictionary_loader_test.cc",
     ],
-    requires_full_emulation = False,
     deps = [
         ":dictionary_token",
         ":pos_matcher",
@@ -512,7 +506,6 @@ mozc_cc_test(
     name = "user_pos_test",
     size = "small",
     srcs = ["user_pos_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":user_pos",
         ":user_pos_interface",
@@ -611,7 +604,6 @@ mozc_cc_test(
     name = "suppression_dictionary_test",
     size = "small",
     srcs = ["suppression_dictionary_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":suppression_dictionary",
         "//base:thread",
@@ -645,7 +637,6 @@ mozc_cc_test(
     name = "suffix_dictionary_test",
     size = "small",
     srcs = ["suffix_dictionary_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":dictionary_interface",
         ":dictionary_test_util",
@@ -704,7 +695,6 @@ mozc_cc_test(
     name = "single_kanji_dictionary_test",
     size = "small",
     srcs = ["single_kanji_dictionary_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":single_kanji_dictionary",
         "//data_manager/testing:mock_data_manager",
diff --git a/src/dictionary/file/BUILD.bazel b/src/dictionary/file/BUILD.bazel
index b7e4c40e5..3ee160e5f 100644
--- a/src/dictionary/file/BUILD.bazel
+++ b/src/dictionary/file/BUILD.bazel
@@ -70,7 +70,6 @@ mozc_cc_test(
     name = "dictionary_file_test",
     size = "small",
     srcs = ["dictionary_file_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":codec_factory",
         ":dictionary_file",
@@ -143,7 +142,6 @@ mozc_cc_test(
     name = "codec_test",
     size = "small",
     srcs = ["codec_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":codec",
         ":codec_factory",
diff --git a/src/dictionary/system/BUILD.bazel b/src/dictionary/system/BUILD.bazel
index 789d2f38c..68fa4b5e8 100644
--- a/src/dictionary/system/BUILD.bazel
+++ b/src/dictionary/system/BUILD.bazel
@@ -68,7 +68,6 @@ mozc_cc_test(
     name = "codec_test",
     size = "small",
     srcs = ["codec_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":codec",
         ":words_info",
@@ -192,7 +191,6 @@ mozc_cc_test(
         "system_dictionary_test.cc",
     ],
     data = ["//data/dictionary_oss:dictionary00.txt"],
-    requires_full_emulation = False,
     deps = [
         ":system_dictionary",
         ":system_dictionary_builder",
@@ -221,7 +219,6 @@ mozc_cc_test(
     name = "value_dictionary_test",
     size = "medium",
     srcs = ["value_dictionary_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":codec",
         ":value_dictionary",
@@ -249,7 +246,6 @@ mozc_cc_test(
     name = "key_expansion_table_test",
     size = "small",
     srcs = ["key_expansion_table_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":key_expansion_table",
         "//testing:gunit_main",
diff --git a/src/dictionary/user_dictionary_session.cc b/src/dictionary/user_dictionary_session.cc
index cf2c2d852..ab3c0fee0 100644
--- a/src/dictionary/user_dictionary_session.cc
+++ b/src/dictionary/user_dictionary_session.cc
@@ -39,6 +39,7 @@
 #include <utility>
 #include <vector>
 
+#include "absl/base/optimization.h"
 #include "absl/container/fixed_array.h"
 #include "absl/strings/string_view.h"
 #include "base/logging.h"
@@ -409,7 +410,7 @@ UserDictionaryCommandStatus::Status UserDictionarySession::Save() {
       default:
         return UserDictionaryCommandStatus::UNKNOWN_ERROR;
     }
-    // Should never reach here.
+    ABSL_UNREACHABLE();
   }
 
   return UserDictionaryCommandStatus::USER_DICTIONARY_COMMAND_SUCCESS;
@@ -505,7 +506,7 @@ UserDictionaryCommandStatus::Status UserDictionarySession::RenameDictionary(
         LOG(ERROR) << "Unknown error code: " << storage_->GetLastError();
         return UserDictionaryCommandStatus::UNKNOWN_ERROR;
     }
-    // Should never reach here.
+    ABSL_UNREACHABLE();
   }
 
   AddUndoCommand(std::make_unique<UndoRenameDictionaryCommand>(dictionary_id,
diff --git a/src/dictionary/user_dictionary_storage.cc b/src/dictionary/user_dictionary_storage.cc
index 255cb745c..1eb9455f1 100644
--- a/src/dictionary/user_dictionary_storage.cc
+++ b/src/dictionary/user_dictionary_storage.cc
@@ -35,6 +35,7 @@
 #include <ostream>
 #include <string>
 
+#include "absl/base/optimization.h"
 #include "absl/status/status.h"
 #include "absl/strings/str_cat.h"
 #include "absl/strings/str_format.h"
@@ -462,7 +463,7 @@ bool UserDictionaryStorage::IsValidDictionaryName(
       LOG(WARNING) << "Unknown status: " << status;
       return false;
   }
-  // Should never reach here.
+  ABSL_UNREACHABLE();
 }
 
 std::string UserDictionaryStorage::default_sync_dictionary_name() {
diff --git a/src/engine/BUILD.bazel b/src/engine/BUILD.bazel
index dfe876baa..3a7ef27a9 100644
--- a/src/engine/BUILD.bazel
+++ b/src/engine/BUILD.bazel
@@ -63,7 +63,6 @@ mozc_cc_test(
         "data_loader_test.cc",
         "//data_manager/testing:mock_mozc.data",
     ],
-    requires_full_emulation = False,
     deps = [
         ":engine_builder",
         "//base:file_util",
@@ -242,7 +241,6 @@ mozc_cc_library(
 mozc_cc_test(
     name = "engine_factory_test",
     srcs = ["engine_factory_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":engine_factory",
         ":engine_interface",
diff --git a/src/ios/BUILD.bazel b/src/ios/BUILD.bazel
index 59136a047..43de45bbc 100644
--- a/src/ios/BUILD.bazel
+++ b/src/ios/BUILD.bazel
@@ -41,21 +41,20 @@ mozc_cc_library(
     visibility = [
     ],
     deps = [
-        "//base:logging",
         "//base:port",
         "//base:util",
         "//config:config_handler",
         "//data_manager",
         "//engine",
+        "//engine:engine_interface",
         "//engine:minimal_engine",
         "//protocol:commands_cc_proto",
         "//protocol:config_cc_proto",
         "//protocol:user_dictionary_storage_cc_proto",
-        "//session",
         "//session:session_handler",
         "//session:session_handler_interface",
         "@com_google_absl//absl/base:core_headers",
-        "@com_google_absl//absl/flags:flag",
+        "@com_google_absl//absl/log",
         "@com_google_absl//absl/synchronization",
     ],
 )
diff --git a/src/ios/ios_engine.cc b/src/ios/ios_engine.cc
index f2ab51a00..3df1136c8 100644
--- a/src/ios/ios_engine.cc
+++ b/src/ios/ios_engine.cc
@@ -34,13 +34,15 @@
 #include <string>
 #include <utility>
 
-#include "absl/flags/flag.h"
+#include "absl/base/optimization.h"
+#include "absl/base/thread_annotations.h"
+#include "absl/log/log.h"
 #include "absl/synchronization/mutex.h"
-#include "base/logging.h"
 #include "base/util.h"
 #include "config/config_handler.h"
 #include "data_manager/data_manager.h"
 #include "engine/engine.h"
+#include "engine/engine_interface.h"
 #include "engine/minimal_engine.h"
 #include "protocol/commands.pb.h"
 #include "protocol/user_dictionary_storage.pb.h"
@@ -317,8 +319,7 @@ bool IosEngine::SwitchInputMode(InputMode mode) {
       target_config = &current_config_tuple_.digit_config;
       break;
     default:
-      LOG(DFATAL) << "Should never reach here";
-      return false;
+      ABSL_UNREACHABLE();
   }
   if (current_input_config_ == target_config) {
     return true;
diff --git a/src/ipc/BUILD.bazel b/src/ipc/BUILD.bazel
index 7531e585b..51f420321 100644
--- a/src/ipc/BUILD.bazel
+++ b/src/ipc/BUILD.bazel
@@ -138,7 +138,6 @@ mozc_cc_test(
     name = "ipc_path_manager_test",
     size = "small",
     srcs = ["ipc_path_manager_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":ipc",
         ":ipc_cc_proto",
@@ -182,7 +181,6 @@ mozc_cc_test(
     size = "small",
     srcs = ["ipc_test.cc"],
     copts = ["$(STACK_FRAME_UNLIMITED)"],  # ipc_test.cc
-    requires_full_emulation = False,
     deps = [
         ":ipc",
         ":ipc_test_util",
@@ -246,7 +244,6 @@ mozc_cc_test(
     name = "named_event_test",
     size = "small",
     srcs = ["named_event_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":named_event",
         "//base:clock",
@@ -304,7 +301,6 @@ mozc_cc_test(
     name = "process_watch_dog_test",
     size = "small",
     srcs = ["process_watch_dog_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":process_watch_dog",
         "//base:clock",
diff --git a/src/prediction/BUILD.bazel b/src/prediction/BUILD.bazel
index cca54bced..7525ef120 100644
--- a/src/prediction/BUILD.bazel
+++ b/src/prediction/BUILD.bazel
@@ -110,7 +110,6 @@ mozc_cc_test(
     size = "small",
     timeout = "moderate",
     srcs = ["user_history_predictor_test.cc"],
-    requires_full_emulation = False,
     tags = [
         "nowin",
     ],  # TODO(yuryu): depends on //base:encryptor
@@ -119,12 +118,12 @@ mozc_cc_test(
         ":user_history_predictor_cc_proto",
         "//base:clock_mock",
         "//base:file_util",
-        "//base:logging",
         "//base:random",
         "//base:system_util",
         "//base:util",
         "//base/container:trie",
         "//base/file:temp_dir",
+        "//base/strings:unicode",
         "//composer",
         "//composer:table",
         "//config:config_handler",
@@ -143,6 +142,7 @@ mozc_cc_test(
         "//testing:mozctest",
         "//usage_stats",
         "//usage_stats:usage_stats_testing_util",
+        "@com_google_absl//absl/log:check",
         "@com_google_absl//absl/random",
         "@com_google_absl//absl/strings",
         "@com_google_absl//absl/strings:str_format",
@@ -245,7 +245,6 @@ mozc_cc_library(
         "//converter:immutable_converter_interface",
         "//converter:node_list_builder",
         "//converter:segments",
-        "//data_manager:data_manager_interface",
         "//dictionary:dictionary_interface",
         "//dictionary:dictionary_token",
         "//dictionary:pos_matcher",
@@ -255,6 +254,7 @@ mozc_cc_library(
         "//request:conversion_request",
         "//request:request_util",
         "//transliteration",
+        "@com_google_absl//absl/base:core_headers",
         "@com_google_absl//absl/log",
         "@com_google_absl//absl/log:check",
         "@com_google_absl//absl/strings",
@@ -269,13 +269,11 @@ mozc_cc_test(
     srcs = [
         "dictionary_prediction_aggregator_test.cc",
     ],
-    requires_full_emulation = False,
     deps = [
         ":dictionary_prediction_aggregator",
         ":result",
         ":single_kanji_prediction_aggregator",
         ":zero_query_dict",
-        "//base:logging",
         "//base:util",
         "//base/container:serialized_string_array",
         "//composer:query",
@@ -300,6 +298,8 @@ mozc_cc_test(
         "//testing:gunit_main",
         "//testing:mozctest",
         "//transliteration",
+        "@com_google_absl//absl/log",
+        "@com_google_absl//absl/log:check",
         "@com_google_absl//absl/strings",
         "@com_google_absl//absl/strings:str_format",
     ],
@@ -312,7 +312,6 @@ mozc_cc_test(
     srcs = [
         "dictionary_predictor_test.cc",
     ],
-    requires_full_emulation = False,
     deps = [
         ":dictionary_predictor",
         ":prediction_aggregator_interface",
@@ -382,7 +381,6 @@ mozc_cc_test(
     srcs = [
         "single_kanji_prediction_aggregator_test.cc",
     ],
-    requires_full_emulation = False,
     deps = [
         ":result",
         ":single_kanji_prediction_aggregator",
@@ -426,7 +424,6 @@ mozc_cc_library(
 mozc_cc_test(
     name = "predictor_test",
     srcs = ["predictor_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":dictionary_predictor",
         ":predictor",
@@ -479,7 +476,6 @@ mozc_cc_library(
 mozc_cc_test(
     name = "zero_query_dict_test",
     srcs = ["zero_query_dict_test.cc"],
-    requires_full_emulation = False,
     visibility = ["//visibility:private"],
     deps = [
         ":zero_query_dict",
@@ -501,7 +497,6 @@ mozc_cc_binary(
         "//base:multifile",
         "//base:util",
         "//storage:existence_filter",
-        "@com_google_absl//absl/base:core_headers",
         "@com_google_absl//absl/flags:flag",
         "@com_google_absl//absl/strings",
     ],
diff --git a/src/prediction/dictionary_prediction_aggregator.cc b/src/prediction/dictionary_prediction_aggregator.cc
index 800ee0a0d..300246587 100644
--- a/src/prediction/dictionary_prediction_aggregator.cc
+++ b/src/prediction/dictionary_prediction_aggregator.cc
@@ -478,7 +478,7 @@ class DictionaryPredictionAggregator::PrefixLookupCallback
     const int key_len = Util::CharsLen(key);
     if (key_len < input_key_len_) {
       result.candidate_attributes |= Segment::Candidate::PARTIALLY_KEY_CONSUMED;
-      result.consumed_key_size = Util::CharsLen(key);
+      result.consumed_key_size = key_len;
     }
     results_->emplace_back(result);
     return (results_->size() < limit_) ? TRAVERSE_CONTINUE : TRAVERSE_DONE;
@@ -649,7 +649,11 @@ PredictionTypes DictionaryPredictionAggregator::AggregatePrediction(
   }
   PredictionTypes selected_types = NO_PREDICTION;
   if (ShouldAggregateRealTimeConversionResults(request, segments)) {
-    AggregateRealtimeConversion(request, realtime_max_size, segments, results);
+    AggregateRealtimeConversion(
+        request, realtime_max_size,
+        /* insert_realtime_top_from_actual_converter= */
+        request.use_actual_converter_for_realtime_conversion(),
+        segments, results);
     selected_types |= REALTIME;
   }
 
@@ -823,7 +827,7 @@ size_t DictionaryPredictionAggregator::GetRealtimeCandidateMaxSize(
       size = default_size;
       break;
     default:
-      size = 0;  // Never reach here
+      DLOG(FATAL) << "Unexpected request type: " << request_type;
   }
 
   return std::min(max_size, size);
@@ -892,15 +896,20 @@ bool DictionaryPredictionAggregator::PushBackTopConversionResult(
 
 void DictionaryPredictionAggregator::AggregateRealtimeConversion(
     const ConversionRequest &request, size_t realtime_candidates_size,
-    const Segments &segments, std::vector<Result> *results) const {
+    bool insert_realtime_top_from_actual_converter, const Segments &segments,
+    std::vector<Result> *results) const {
   DCHECK(converter_);
   DCHECK(immutable_converter_);
   DCHECK(results);
+  if (realtime_candidates_size == 0) {
+    return;
+  }
+
   // First insert a top conversion result.
   // Note: Do not call actual converter for partial suggestion / prediction.
   // Converter::StartConversion() resets conversion key from composer
   // rather than using the key in segments.
-  if (request.use_actual_converter_for_realtime_conversion() &&
+  if (insert_realtime_top_from_actual_converter &&
       request.request_type() != ConversionRequest::PARTIAL_SUGGESTION &&
       request.request_type() != ConversionRequest::PARTIAL_PREDICTION) {
     if (!PushBackTopConversionResult(request, segments, results)) {
@@ -908,10 +917,6 @@ void DictionaryPredictionAggregator::AggregateRealtimeConversion(
     }
   }
 
-  if (realtime_candidates_size == 0) {
-    return;
-  }
-
   const ConversionRequest request_for_realtime =
       GetConversionRequestForRealtimeCandidates(request,
                                                 realtime_candidates_size);
@@ -1727,8 +1732,10 @@ void DictionaryPredictionAggregator::AggregateTypingCorrectedPrediction(
 
     if (is_realtime_only) {
       constexpr int kRealtimeSize = 1;
-      AggregateRealtimeConversion(corrected_request, kRealtimeSize,
-                                  corrected_segments, &corrected_results);
+      AggregateRealtimeConversion(
+          corrected_request, kRealtimeSize,
+          /* insert_realtime_top_from_actual_converter= */ false,
+          corrected_segments, &corrected_results);
 
     } else {
       const UnigramConfig &unigram_config = GetUnigramConfig(request);
@@ -1740,8 +1747,10 @@ void DictionaryPredictionAggregator::AggregateTypingCorrectedPrediction(
 
       if (base_selected_types & REALTIME) {
         constexpr int kRealtimeSize = 2;
-        AggregateRealtimeConversion(corrected_request, kRealtimeSize,
-                                    corrected_segments, &corrected_results);
+        AggregateRealtimeConversion(
+            corrected_request, kRealtimeSize,
+            /* insert_realtime_top_from_actual_converter= */ false,
+            corrected_segments, &corrected_results);
       }
 
       if (base_selected_types & BIGRAM) {
diff --git a/src/prediction/dictionary_prediction_aggregator.h b/src/prediction/dictionary_prediction_aggregator.h
index 64ff6cb2e..e52239ed6 100644
--- a/src/prediction/dictionary_prediction_aggregator.h
+++ b/src/prediction/dictionary_prediction_aggregator.h
@@ -211,10 +211,10 @@ class DictionaryPredictionAggregator : public PredictionAggregatorInterface {
 
   // Aggregate* methods aggregate the candidates with different resources
   // and algorithms.
-  void AggregateRealtimeConversion(const ConversionRequest &request,
-                                   size_t realtime_candidates_size,
-                                   const Segments &segments,
-                                   std::vector<Result> *results) const;
+  void AggregateRealtimeConversion(
+      const ConversionRequest &request, size_t realtime_candidates_size,
+      bool insert_realtime_top_from_actual_converter, const Segments &segments,
+      std::vector<Result> *results) const;
 
   void AggregateBigramPrediction(const ConversionRequest &request,
                                  const Segments &segments,
diff --git a/src/prediction/dictionary_prediction_aggregator_test.cc b/src/prediction/dictionary_prediction_aggregator_test.cc
index 3777b52fb..bc14815dd 100644
--- a/src/prediction/dictionary_prediction_aggregator_test.cc
+++ b/src/prediction/dictionary_prediction_aggregator_test.cc
@@ -40,12 +40,13 @@
 #include <utility>
 #include <vector>
 
+#include "absl/log/check.h"
+#include "absl/log/log.h"
 #include "absl/strings/match.h"
 #include "absl/strings/str_format.h"
 #include "absl/strings/str_join.h"
 #include "absl/strings/string_view.h"
 #include "base/container/serialized_string_array.h"
-#include "base/logging.h"
 #include "base/util.h"
 #include "composer/query.h"
 #include "composer/table.h"
@@ -122,12 +123,13 @@ class DictionaryPredictionAggregatorTestPeer {
                                           results);
   }
 
-  void AggregateRealtimeConversion(const ConversionRequest &request,
-                                   size_t realtime_candidates_size,
-                                   const Segments &segments,
-                                   std::vector<Result> *results) const {
-    aggregator_.AggregateRealtimeConversion(request, realtime_candidates_size,
-                                            segments, results);
+  void AggregateRealtimeConversion(
+      const ConversionRequest &request, size_t realtime_candidates_size,
+      bool insert_realtime_top_from_actual_converter, const Segments &segments,
+      std::vector<Result> *results) const {
+    aggregator_.AggregateRealtimeConversion(
+        request, realtime_candidates_size,
+        insert_realtime_top_from_actual_converter, segments, results);
   }
 
   void AggregateSuffixPrediction(const ConversionRequest &request,
@@ -1660,11 +1662,8 @@ TEST_F(DictionaryPredictionAggregatorTest, AggregateRealtimeConversion) {
     segments.mutable_conversion_segment(0)->add_candidate()->value = "history2";
 
     std::vector<Result> results;
-    suggestion_convreq_->set_use_actual_converter_for_realtime_conversion(
-        false);
-
-    aggregator.AggregateRealtimeConversion(*suggestion_convreq_, 10, segments,
-                                           &results);
+    aggregator.AggregateRealtimeConversion(*suggestion_convreq_, 10, false,
+                                           segments, &results);
     ASSERT_EQ(results.size(), 1);
     EXPECT_EQ(results[0].types, REALTIME);
     EXPECT_EQ(results[0].key, kKey);
@@ -1683,10 +1682,9 @@ TEST_F(DictionaryPredictionAggregatorTest, AggregateRealtimeConversion) {
     segments.mutable_conversion_segment(0)->add_candidate()->value = "history2";
 
     std::vector<Result> results;
-    suggestion_convreq_->set_use_actual_converter_for_realtime_conversion(true);
 
-    aggregator.AggregateRealtimeConversion(*suggestion_convreq_, 10, segments,
-                                           &results);
+    aggregator.AggregateRealtimeConversion(*suggestion_convreq_, 10, true,
+                                           segments, &results);
 
     // When |request.use_actual_converter_for_realtime_conversion| is true,
     // the extra label REALTIME_TOP is expected to be added.
@@ -1705,6 +1703,100 @@ TEST_F(DictionaryPredictionAggregatorTest, AggregateRealtimeConversion) {
   }
 }
 
+TEST_F(DictionaryPredictionAggregatorTest, UseActualConverterRequest) {
+  auto data_and_aggregator = std::make_unique<MockDataAndAggregator>();
+  data_and_aggregator->Init();
+
+  const DictionaryPredictionAggregatorTestPeer &aggregator =
+      data_and_aggregator->aggregator();
+
+  constexpr char kKey[] = "わたしのなまえはなかのです";
+
+  // Set up mock converter
+  {
+    // Make segments like:
+    // "わたしの"    | "なまえは" | "なかのです"
+    // "Watashino" | "Namaeha" | "Nakanodesu"
+    Segments segments;
+
+    auto add_segment = [&segments](absl::string_view key,
+                                   absl::string_view value) {
+      Segment *segment = segments.add_segment();
+      segment->set_key(key);
+      Segment::Candidate *candidate = segment->add_candidate();
+      candidate->key = std::string(key);
+      candidate->value = std::string(value);
+    };
+
+    add_segment("わたしの", "Watashino");
+    add_segment("なまえは", "Namaeha");
+    add_segment("なかのです", "Nakanodesu");
+
+    EXPECT_CALL(*data_and_aggregator->mutable_converter(),
+                StartConversion(_, _))
+        .WillRepeatedly(DoAll(SetArgPointee<1>(segments), Return(true)));
+  }
+  // Set up mock immutable converter
+  {
+    Segments segments;
+    Segment *segment = segments.add_segment();
+    segment->set_key("わたしのなまえはなかのです");
+    Segment::Candidate *candidate = segment->add_candidate();
+    candidate->value = "私の名前は中野です";
+    candidate->key = ("わたしのなまえはなかのです");
+    // "わたしの, 私の", "わたし, 私"
+    candidate->PushBackInnerSegmentBoundary(12, 6, 9, 3);
+    // "なまえは, 名前は", "なまえ, 名前"
+    candidate->PushBackInnerSegmentBoundary(12, 9, 9, 6);
+    // "なかのです, 中野です", "なかの, 中野"
+    candidate->PushBackInnerSegmentBoundary(15, 12, 9, 6);
+    EXPECT_CALL(*data_and_aggregator->mutable_immutable_converter(),
+                ConvertForRequest(_, _))
+        .WillRepeatedly(DoAll(SetArgPointee<1>(segments), Return(true)));
+  }
+
+  {
+    Segments segments;
+
+    InitSegmentsWithKey(kKey, &segments);
+    suggestion_convreq_->set_use_actual_converter_for_realtime_conversion(true);
+
+    std::vector<Result> results;
+    aggregator.AggregatePredictionForRequest(*suggestion_convreq_, segments,
+                                             &results);
+    ASSERT_GT(results.size(), 0);
+    bool has_realtime_top = false;
+    for (const Result &r : results) {
+      if (r.types & PredictionType::REALTIME_TOP) {
+        has_realtime_top = true;
+        break;
+      }
+    }
+    EXPECT_TRUE(has_realtime_top);
+  }
+
+  {
+    Segments segments;
+
+    InitSegmentsWithKey(kKey, &segments);
+
+    suggestion_convreq_->set_use_actual_converter_for_realtime_conversion(
+        false);
+    std::vector<Result> results;
+    aggregator.AggregatePredictionForRequest(*suggestion_convreq_, segments,
+                                             &results);
+    ASSERT_GT(results.size(), 0);
+    bool has_realtime_top = false;
+    for (const Result &r : results) {
+      if (r.types & PredictionType::REALTIME_TOP) {
+        has_realtime_top = true;
+        break;
+      }
+    }
+    EXPECT_FALSE(has_realtime_top);
+  }
+}
+
 TEST_F(DictionaryPredictionAggregatorTest, GetCandidateCutoffThreshold) {
   std::unique_ptr<MockDataAndAggregator> data_and_aggregator =
       CreateAggregatorWithMockData();
@@ -2291,9 +2383,8 @@ TEST_F(DictionaryPredictionAggregatorTest,
 
   std::vector<Result> results;
 
-  suggestion_convreq_->set_use_actual_converter_for_realtime_conversion(false);
-  aggregator.AggregateRealtimeConversion(*suggestion_convreq_, 10, segments,
-                                         &results);
+  aggregator.AggregateRealtimeConversion(*suggestion_convreq_, 10, false,
+                                         segments, &results);
   ASSERT_EQ(2, results.size());
 
   EXPECT_EQ(results[0].types, REALTIME);
@@ -2358,8 +2449,8 @@ TEST_F(DictionaryPredictionAggregatorTest,
   }
 
   SetUpInputForSuggestion(kKeyWithDe, composer_.get(), &segments);
-  aggregator.AggregateRealtimeConversion(*suggestion_convreq_, 1, segments,
-                                         &results);
+  aggregator.AggregateRealtimeConversion(*suggestion_convreq_, 1, false,
+                                         segments, &results);
   EXPECT_EQ(results.size(), 1);
   EXPECT_EQ(results[0].types, REALTIME);
   EXPECT_NE(0, (results[0].candidate_attributes &
diff --git a/src/prediction/gen_suggestion_filter_main.cc b/src/prediction/gen_suggestion_filter_main.cc
index 5c3998cac..670423633 100644
--- a/src/prediction/gen_suggestion_filter_main.cc
+++ b/src/prediction/gen_suggestion_filter_main.cc
@@ -34,7 +34,6 @@
 #include <string>
 #include <vector>
 
-#include "absl/base/optimization.h"
 #include "absl/flags/flag.h"
 #include "absl/strings/string_view.h"
 #include "base/codegen_bytearray_stream.h"
@@ -130,7 +129,6 @@ ExistenceFilterBuilder SetupFilter(
     }
   }
   LOG(FATAL) << "Gave up retrying suggestion filter generation.";
-  ABSL_UNREACHABLE();
 }
 
 }  // namespace
diff --git a/src/prediction/predictor.cc b/src/prediction/predictor.cc
index a40e07f2c..c621f66ce 100644
--- a/src/prediction/predictor.cc
+++ b/src/prediction/predictor.cc
@@ -307,7 +307,7 @@ ConversionRequest MobilePredictor::GetRequestForPredict(
       break;
     }
     default:
-      DLOG(ERROR) << "Never reach here.";
+      DLOG(ERROR) << "Unexpected request type: " << request.request_type();
   }
   return ret;
 }
@@ -391,8 +391,8 @@ bool MobilePredictor::PredictForRequest(const ConversionRequest &request,
                                                          segments);
       break;
     }
-    default: {
-    }  // Never reach here
+    default:
+      DLOG(FATAL) << "Unexpected request type: " << request.request_type();
   }
 
   MaybeFillFallbackPos(segments);
diff --git a/src/prediction/user_history_predictor_test.cc b/src/prediction/user_history_predictor_test.cc
index 35152b5b3..cd0e6589c 100644
--- a/src/prediction/user_history_predictor_test.cc
+++ b/src/prediction/user_history_predictor_test.cc
@@ -38,6 +38,7 @@
 #include <string>
 #include <vector>
 
+#include "absl/log/check.h"
 #include "absl/random/random.h"
 #include "absl/strings/match.h"
 #include "absl/strings/str_cat.h"
@@ -49,8 +50,8 @@
 #include "base/container/trie.h"
 #include "base/file/temp_dir.h"
 #include "base/file_util.h"
-#include "base/logging.h"
 #include "base/random.h"
+#include "base/strings/unicode.h"
 #include "base/system_util.h"
 #include "base/util.h"
 #include "composer/composer.h"
@@ -2729,20 +2730,15 @@ void InitSegmentsFromInputSequence(const absl::string_view text,
   DCHECK(composer);
   DCHECK(request);
   DCHECK(segments);
-  const char *begin = text.data();
-  const char *end = text.data() + text.size();
-  size_t mblen = 0;
-
-  while (begin < end) {
+  for (const UnicodeChar ch : Utf8AsUnicodeChar(text)) {
     commands::KeyEvent key;
-    const char32_t w = Util::Utf8ToCodepoint(begin, end, &mblen);
+    const char32_t w = ch.char32();
     if (w <= 0x7F) {  // IsAscii, w is unsigned.
-      key.set_key_code(*begin);
+      key.set_key_code(w);
     } else {
       key.set_key_code('?');
-      key.set_key_string(std::string(begin, mblen));
+      key.set_key_string(ch.utf8());
     }
-    begin += mblen;
     composer->InsertCharacterKeyEvent(key);
   }
 
diff --git a/src/renderer/BUILD.bazel b/src/renderer/BUILD.bazel
index 5469eaaac..749d449e7 100644
--- a/src/renderer/BUILD.bazel
+++ b/src/renderer/BUILD.bazel
@@ -78,7 +78,6 @@ mozc_cc_test(
     name = "renderer_client_test",
     size = "medium",
     srcs = ["renderer_client_test.cc"],
-    requires_full_emulation = False,
     tags = ["noandroid"],
     deps = [
         ":renderer_client",
@@ -125,7 +124,6 @@ mozc_cc_test(
     name = "renderer_server_test",
     size = "medium",
     srcs = ["renderer_server_test.cc"],
-    requires_full_emulation = False,
     tags = ["noandroid"],
     deps = [
         ":renderer_client",
@@ -161,7 +159,6 @@ mozc_cc_test(
         "table_layout_interface.h",
         "table_layout_test.cc",
     ],
-    requires_full_emulation = False,
     tags = ["noandroid"],
     deps = [
         ":table_layout",
@@ -201,7 +198,6 @@ mozc_cc_test(
     name = "window_util_test",
     size = "small",
     srcs = ["window_util_test.cc"],
-    requires_full_emulation = False,
     tags = ["noandroid"],
     deps = [
         ":window_util",
@@ -231,7 +227,6 @@ mozc_cc_test(
     name = "renderer_style_handler_test",
     size = "small",
     srcs = ["renderer_style_handler_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":renderer_style_handler",
         "//protocol:renderer_cc_proto",
diff --git a/src/renderer/win32/BUILD.bazel b/src/renderer/win32/BUILD.bazel
index 490845f24..929ebb017 100644
--- a/src/renderer/win32/BUILD.bazel
+++ b/src/renderer/win32/BUILD.bazel
@@ -266,10 +266,10 @@ mozc_cc_library(
     deps = [
         "//base:coordinates",
         "//base:logging",
-        "//base:util",
         "//base/win32:wide_char",
         "//bazel/win32:gdi32",
         "//bazel/win32:user32",
+        "@com_google_absl//absl/base:core_headers",
         "@com_microsoft_wil//:wil",
     ],
 )
@@ -326,6 +326,7 @@ mozc_cc_test(
         "//data/test/renderer/win32:test_spec_cc_proto",
         "//testing:gunit_main",
         "//testing:mozctest",
+        "@com_google_absl//absl/base:core_headers",
         "@com_google_absl//absl/strings",
         "@com_microsoft_wil//:wil",
     ],
diff --git a/src/renderer/win32/win32_image_util.cc b/src/renderer/win32/win32_image_util.cc
index e207f9500..9eab463a5 100644
--- a/src/renderer/win32/win32_image_util.cc
+++ b/src/renderer/win32/win32_image_util.cc
@@ -29,8 +29,8 @@
 
 #include "renderer/win32/win32_image_util.h"
 
-#include <windows.h>
 #include <wil/resource.h>
+#include <windows.h>
 
 #include <algorithm>
 #include <bitset>
@@ -40,6 +40,7 @@
 #include <string>
 #include <vector>
 
+#include "absl/base/optimization.h"
 #include "base/coordinates.h"
 #include "base/logging.h"
 #include "base/win32/wide_char.h"
@@ -163,8 +164,7 @@ class Balloon {
       case BalloonImage::BalloonImageInfo::kLeft:
         return left_ - balloon_tail_height_;
       default:
-        CHECK(false) << "Do not reach here";
-        return 0.0;
+        ABSL_UNREACHABLE();
     }
   }
   double GetTailY() const {
@@ -178,8 +178,7 @@ class Balloon {
       case BalloonImage::BalloonImageInfo::kLeft:
         return top_ + height_ / 2.0;
       default:
-        CHECK(false) << "Do not reach here";
-        return 0.0;
+        ABSL_UNREACHABLE();
     }
   }
 
diff --git a/src/renderer/win32/win32_image_util_test.cc b/src/renderer/win32/win32_image_util_test.cc
index c98d84a97..69611db02 100644
--- a/src/renderer/win32/win32_image_util_test.cc
+++ b/src/renderer/win32/win32_image_util_test.cc
@@ -33,6 +33,8 @@
 #include <atltypes.h>
 #include <wil/resource.h>
 
+#include <cstdlib>
+
 #undef StrCat
 
 #include <cstddef>
@@ -41,10 +43,11 @@
 #include <string>
 #include <vector>
 
+#include "absl/log/check.h"
+#include "absl/log/log.h"
 #include "absl/strings/str_cat.h"
 #include "base/file_stream.h"
 #include "base/file_util.h"
-#include "base/logging.h"
 #include "base/protobuf/text_format.h"
 #include "base/win32/wide_char.h"
 #include "base/win32/win_font_test_helper.h"
@@ -240,8 +243,7 @@ class BalloonImageTest : public ::testing::Test,
       case BalloonImageInfo::kRight:
         return TestSpec::RIGHT;
       default:
-        CHECK(false) << "Unexpected direction=" << direction;
-        return TestSpec::UNSPECIFIED;  // must not reach here.
+        LOG(FATAL) << "Unexpected direction: " << direction;
     }
   }
 
@@ -249,9 +251,7 @@ class BalloonImageTest : public ::testing::Test,
       TestSpec::TailDirection direction) {
     switch (direction) {
       case TestSpec::UNSPECIFIED:
-        CHECK(false) << "TailDirection must be set";
-        // must not reach here.
-        return BalloonImageInfo::TailDirection::kTop;
+        LOG(FATAL) << "TailDirection must be set.";
       case TestSpec::TOP:
         return BalloonImageInfo::TailDirection::kTop;
       case TestSpec::BOTTOM:
@@ -261,9 +261,7 @@ class BalloonImageTest : public ::testing::Test,
       case TestSpec::RIGHT:
         return BalloonImageInfo::TailDirection::kRight;
       default:
-        CHECK(false) << "Unexpected direction=" << direction;
-        // must not reach here.
-        return BalloonImageInfo::TailDirection::kTop;
+        LOG(FATAL) << "Unexpected direction: " << direction;
     }
   }
 
diff --git a/src/rewriter/BUILD.bazel b/src/rewriter/BUILD.bazel
index 0a9250a26..6c96977e1 100644
--- a/src/rewriter/BUILD.bazel
+++ b/src/rewriter/BUILD.bazel
@@ -54,7 +54,6 @@ mozc_cc_test(
     name = "merger_rewriter_test",
     size = "small",
     srcs = ["merger_rewriter_test.cc"],
-    requires_full_emulation = False,
     visibility = ["//visibility:private"],
     deps = [
         ":merger_rewriter",
@@ -96,7 +95,6 @@ mozc_cc_library(
 mozc_cc_test(
     name = "collocation_rewriter_test",
     srcs = ["collocation_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":collocation_rewriter",
         "//converter:segments",
@@ -144,7 +142,6 @@ mozc_cc_test(
     size = "small",
     timeout = "moderate",
     srcs = ["user_segment_history_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":number_rewriter",
         ":user_segment_history_rewriter",
@@ -199,7 +196,6 @@ mozc_cc_test(
     name = "user_boundary_history_rewriter_test",
     size = "small",
     srcs = ["user_boundary_history_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":user_boundary_history_rewriter",
         "//base:file_util",
@@ -246,7 +242,6 @@ mozc_cc_test(
     name = "date_rewriter_test",
     size = "small",
     srcs = ["date_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":date_rewriter",
         "//base:clock",
@@ -299,7 +294,6 @@ mozc_cc_test(
     size = "small",
     timeout = "moderate",
     srcs = ["number_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":number_rewriter",
         ":rewriter_interface",
@@ -343,7 +337,6 @@ mozc_cc_test(
     name = "small_letter_rewriter_test",
     size = "small",
     srcs = ["small_letter_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":small_letter_rewriter",
         "//base/strings:assign",
@@ -386,7 +379,6 @@ mozc_cc_test(
     size = "small",
     timeout = "moderate",
     srcs = ["transliteration_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":transliteration_rewriter",
         "//base:logging",
@@ -436,7 +428,6 @@ mozc_cc_test(
     name = "language_aware_rewriter_test",
     size = "small",
     srcs = ["language_aware_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":language_aware_rewriter",
         "//composer",
@@ -478,7 +469,6 @@ mozc_cc_test(
     name = "version_rewriter_test",
     size = "small",
     srcs = ["version_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":version_rewriter",
         "//converter:segments",
@@ -519,7 +509,6 @@ mozc_cc_test(
     size = "small",
     timeout = "moderate",
     srcs = ["symbol_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":symbol_rewriter",
         "//base:logging",
@@ -563,7 +552,6 @@ mozc_cc_test(
     name = "emoticon_rewriter_test",
     size = "small",
     srcs = ["emoticon_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":emoticon_rewriter",
         ":rewriter_interface",
@@ -605,7 +593,6 @@ mozc_cc_test(
     name = "variants_rewriter_test",
     size = "small",
     srcs = ["variants_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":variants_rewriter",
         "//base:japanese_util",
@@ -646,7 +633,6 @@ mozc_cc_test(
     name = "english_variants_rewriter_test",
     size = "small",
     srcs = ["english_variants_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":english_variants_rewriter",
         "//converter:segments",
@@ -680,7 +666,6 @@ mozc_cc_test(
     name = "fortune_rewriter_test",
     size = "small",
     srcs = ["fortune_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":fortune_rewriter",
         "//base:logging",
@@ -711,7 +696,6 @@ mozc_cc_test(
     name = "dice_rewriter_test",
     size = "small",
     srcs = ["dice_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":dice_rewriter",
         "//converter:segments",
@@ -747,7 +731,6 @@ mozc_cc_test(
     size = "small",
     timeout = "moderate",
     srcs = ["calculator_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":calculator_rewriter",
         "//base:logging",
@@ -792,7 +775,6 @@ mozc_cc_test(
     size = "small",
     timeout = "moderate",
     srcs = ["unicode_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":unicode_rewriter",
         "//composer",
@@ -826,7 +808,6 @@ mozc_cc_test(
     name = "user_dictionary_rewriter_test",
     size = "small",
     srcs = ["user_dictionary_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":user_dictionary_rewriter",
         "//base:logging",
@@ -859,7 +840,6 @@ mozc_cc_test(
     name = "dictionary_generator_test",
     size = "small",
     srcs = ["dictionary_generator_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":dictionary_generator",
         "//data_manager/testing:mock_data_manager",
@@ -946,7 +926,6 @@ mozc_cc_test(
     size = "small",
     timeout = "moderate",
     srcs = ["emoji_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":emoji_rewriter",
         ":variants_rewriter",
@@ -1015,7 +994,6 @@ mozc_cc_test(
     name = "single_kanji_rewriter_test",
     size = "small",
     srcs = ["single_kanji_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":single_kanji_rewriter",
         "//converter:segments",
@@ -1065,7 +1043,6 @@ mozc_cc_test(
     name = "focus_candidate_rewriter_test",
     size = "small",
     srcs = ["focus_candidate_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":focus_candidate_rewriter",
         "//base:number_util",
@@ -1102,7 +1079,6 @@ mozc_cc_test(
     srcs = [
         "zipcode_rewriter_test.cc",
     ],
-    requires_full_emulation = False,
     deps = [
         ":zipcode_rewriter",
         "//base:logging",
@@ -1141,7 +1117,6 @@ mozc_cc_test(
     name = "t13n_promotion_rewriter_test",
     size = "small",
     srcs = ["t13n_promotion_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":t13n_promotion_rewriter",
         ":transliteration_rewriter",
@@ -1178,7 +1153,6 @@ mozc_cc_test(
     name = "command_rewriter_test",
     size = "small",
     srcs = ["command_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":command_rewriter",
         "//config:config_handler",
@@ -1216,7 +1190,6 @@ mozc_cc_test(
     name = "environmental_filter_rewriter_test",
     size = "small",
     srcs = ["environmental_filter_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":emoji_rewriter",
         ":environmental_filter_rewriter",
@@ -1251,7 +1224,6 @@ mozc_cc_test(
     size = "small",
     timeout = "moderate",
     srcs = ["remove_redundant_candidate_rewriter_test.cc"],
-    requires_full_emulation = True,
     deps = [
         ":remove_redundant_candidate_rewriter",
         "//converter:segments",
@@ -1305,7 +1277,6 @@ mozc_cc_test(
     name = "usage_rewriter_test",
     size = "small",
     srcs = ["usage_rewriter_test.cc"],
-    requires_full_emulation = False,
     tags = ["noandroid"],
     target_compatible_with = mozc_select_enable_usage_rewriter(
         off = ["@platforms//:incompatible"],
@@ -1358,7 +1329,6 @@ mozc_cc_test(
     name = "correction_rewriter_test",
     size = "small",
     srcs = ["correction_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":correction_rewriter",
         "//base/container:serialized_string_array",
@@ -1403,7 +1373,6 @@ mozc_cc_test(
     name = "a11y_description_rewriter_test",
     size = "small",
     srcs = ["a11y_description_rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":a11y_description_rewriter",
         "//data_manager",
@@ -1470,7 +1439,6 @@ mozc_cc_test(
     size = "small",
     timeout = "moderate",
     srcs = ["rewriter_test.cc"],
-    requires_full_emulation = False,
     deps = [
         "rewriter",
         ":rewriter_interface",
@@ -1500,7 +1468,6 @@ mozc_cc_test(
     name = "collocation_util_test",
     size = "small",
     srcs = ["collocation_util_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":collocation_util",
         "//testing:gunit_main",
@@ -1580,7 +1547,6 @@ mozc_cc_library(
 mozc_cc_test(
     name = "number_compound_util_test",
     srcs = ["number_compound_util_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":number_compound_util",
         "//base/container:serialized_string_array",
diff --git a/src/rewriter/calculator/BUILD.bazel b/src/rewriter/calculator/BUILD.bazel
index a5120b4b9..6c31c3432 100644
--- a/src/rewriter/calculator/BUILD.bazel
+++ b/src/rewriter/calculator/BUILD.bazel
@@ -72,7 +72,6 @@ mozc_cc_test(
     size = "small",
     srcs = ["calculator_test.cc"],
     data = ["//data/test/calculator:testset.txt"],
-    requires_full_emulation = False,
     deps = [
         ":calculator",
         "//base:file_util",
diff --git a/src/session/BUILD.bazel b/src/session/BUILD.bazel
index 348dbd16a..58bd8029c 100644
--- a/src/session/BUILD.bazel
+++ b/src/session/BUILD.bazel
@@ -90,7 +90,6 @@ mozc_cc_test(
     size = "small",
     timeout = "moderate",
     srcs = ["session_converter_test.cc"],
-    requires_full_emulation = False,
     shard_count = 8,
     tags = ["noandroid"],  # TODO(b/73698251): disabled due to errors
     deps = [
@@ -125,7 +124,6 @@ mozc_cc_test(
     size = "small",
     timeout = "moderate",
     srcs = ["session_converter_stress_test.cc"],
-    requires_full_emulation = False,
     shard_count = 8,
     deps = [
         ":session_converter",
@@ -182,7 +180,6 @@ mozc_cc_test(
     name = "session_test",
     size = "small",
     srcs = ["session_test.cc"],
-    requires_full_emulation = False,
     shard_count = 8,
     deps = [
         ":request_test_util",
@@ -228,7 +225,6 @@ mozc_cc_test(
         "common.h",
         "session_regression_test.cc",
     ],
-    requires_full_emulation = False,
     shard_count = 8,
     deps = [
         ":request_test_util",
@@ -266,7 +262,6 @@ mozc_cc_test(
     name = "session_observer_handler_test",
     size = "small",
     srcs = ["session_observer_handler_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":session_observer_handler",
         ":session_observer_interface",
@@ -358,7 +353,6 @@ mozc_cc_test(
         "common.h",
         "session_handler_test.cc",
     ],
-    requires_full_emulation = False,
     deps = [
         ":session_handler",
         ":session_handler_interface",
@@ -435,7 +429,6 @@ mozc_cc_test(
     name = "request_test_util_test",
     size = "small",
     srcs = ["request_test_util_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":request_test_util",
         "//protocol:commands_cc_proto",
@@ -491,7 +484,6 @@ mozc_cc_test(
     name = "session_watch_dog_test",
     size = "small",
     srcs = ["session_watch_dog_test.cc"],
-    requires_full_emulation = False,
     tags = [
         "noandroid",
         "nomac",  # TODO(b/281742982) flaky for mac on forge
@@ -534,7 +526,6 @@ mozc_cc_test(
     name = "session_usage_observer_test",
     size = "small",
     srcs = ["session_usage_observer_test.cc"],
-    requires_full_emulation = False,
     tags = ["noandroid"],  # TODO(b/73698251): disabled due to errors
     deps = [
         ":session_usage_observer",
@@ -575,7 +566,6 @@ mozc_cc_test(
     name = "key_info_util_test",
     size = "small",
     srcs = ["key_info_util_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":key_info_util",
         "//composer:key_event_util",
@@ -605,7 +595,6 @@ mozc_cc_test(
     name = "session_usage_stats_util_test",
     size = "small",
     srcs = ["session_usage_stats_util_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":session_usage_stats_util",
         "//composer:key_parser",
@@ -662,7 +651,6 @@ mozc_cc_test(
     name = "random_keyevents_generator_test",
     size = "small",
     srcs = ["random_keyevents_generator_test.cc"],
-    requires_full_emulation = False,
     deps = [
         ":random_keyevents_generator",
         "//protocol:commands_cc_proto",
@@ -678,7 +666,6 @@ mozc_cc_test(
         "common.h",
         "session_handler_stress_test.cc",
     ],
-    requires_full_emulation = False,
     shard_count = 16,
     tags = ["noandroid"],  # TODO(b/73698251): disabled due to errors
     deps = [
@@ -768,7 +755,6 @@ mozc_cc_test(
         "//data/test/session/scenario:scenario_files",
         "//data/test/session/scenario/usage_stats:usage_stats_scenario_files",
     ],
-    requires_full_emulation = False,
     shard_count = 8,
     tags = [
         "noandroid",  # TODO(b/73698251): disabled due to errors
diff --git a/src/session/request_test_util.cc b/src/session/request_test_util.cc
index 8dfc6cbad..1090f97c9 100644
--- a/src/session/request_test_util.cc
+++ b/src/session/request_test_util.cc
@@ -29,9 +29,10 @@
 
 // Test utility for Request.
 
-#include "protocol/commands.pb.h"
 #include "session/request_test_util.h"
 
+#include "protocol/commands.pb.h"
+
 namespace mozc {
 namespace commands {
 
@@ -39,6 +40,9 @@ void RequestForUnitTest::FillMobileRequest(Request *request) {
   request->set_zero_query_suggestion(true);
   request->set_mixed_conversion(true);
   request->set_update_input_mode_from_surrounding_text(false);
+  // TODO(toshiyuki):
+  // Change the romanji table to TOGGLE_FLICK_TO_HIRAGANA
+  // TWELVE_KEYS_TO_HIRAGANA is not used from anywhere in the current Gboard.
   request->set_special_romanji_table(Request::TWELVE_KEYS_TO_HIRAGANA);
   request->set_kana_modifier_insensitive_conversion(true);
   request->set_auto_partial_suggestion(true);
diff --git a/src/win32/base/BUILD.bazel b/src/win32/base/BUILD.bazel
index e9cb4ceb9..54202bf64 100644
--- a/src/win32/base/BUILD.bazel
+++ b/src/win32/base/BUILD.bazel
@@ -162,11 +162,11 @@ mozc_cc_library(
     target_compatible_with = ["@platforms//os:windows"],
     deps = [
         ":input_dll",
-        ":msctf_dll",
         ":tsf_profile",
         "//base:logging",
         "//base:system_util",
         "//base/win32:wide_char",
+        "@com_google_absl//absl/base:core_headers",
         "@com_microsoft_wil//:wil",
     ],
 )
@@ -308,7 +308,7 @@ mozc_cc_library(
     target_compatible_with = ["@platforms//os:windows"],
     deps = [
         ":keyboard",
-        "//base:logging",
+        "@com_google_absl//absl/base:core_headers",
     ],
 )
 
diff --git a/src/win32/base/imm_util.cc b/src/win32/base/imm_util.cc
index 036bc5045..80871f314 100644
--- a/src/win32/base/imm_util.cc
+++ b/src/win32/base/imm_util.cc
@@ -43,6 +43,7 @@
 #include <string>
 #include <vector>
 
+#include "absl/base/optimization.h"
 #include "base/logging.h"
 #include "base/system_util.h"
 #include "base/win32/wide_char.h"
@@ -144,8 +145,7 @@ bool ImeUtil::WaitForAsmCacheReady(uint32_t timeout_msec) {
       LOG(ERROR) << "WaitForSingleObject with unknown error: " << result;
       return false;
   }
-  LOG(FATAL) << "Should never reach here.";
-  return false;
+  ABSL_UNREACHABLE();
 }
 
 }  // namespace win32
diff --git a/src/win32/base/surrogate_pair_observer.cc b/src/win32/base/surrogate_pair_observer.cc
index 8b6b1f632..44050fd9e 100644
--- a/src/win32/base/surrogate_pair_observer.cc
+++ b/src/win32/base/surrogate_pair_observer.cc
@@ -29,7 +29,7 @@
 
 #include "win32/base/surrogate_pair_observer.h"
 
-#include "base/logging.h"
+#include "absl/base/optimization.h"
 #include "win32/base/keyboard.h"
 
 namespace mozc {
@@ -196,8 +196,7 @@ SurrogatePairObserver::ClientAction SurrogatePairObserver::OnKeyEvent(
       return ClientAction(DO_DEFAULT_ACTION_WITH_RETURNED_UCS4, ucs2);
     }
     default:
-      DLOG(FATAL) << "must not reach here.";
-      return ClientAction(DO_DEFAULT_ACTION, 0);
+      ABSL_UNREACHABLE();
   }
 }
 
diff --git a/src/win32/tip/BUILD.bazel b/src/win32/tip/BUILD.bazel
index 017e53538..a80ea8528 100644
--- a/src/win32/tip/BUILD.bazel
+++ b/src/win32/tip/BUILD.bazel
@@ -169,9 +169,8 @@ mozc_cc_library(
         ":tip_dll_module",
         ":tip_text_service",
         ":tip_ui_element_delegate",
-        "//base:logging",
         "//base/win32:com",
-        "//base/win32:com_implements",
+        "@com_google_absl//absl/base:core_headers",
         "@com_microsoft_wil//:wil",
     ],
 )
@@ -426,6 +425,7 @@ mozc_cc_library(
         "//protocol:candidates_cc_proto",
         "//protocol:commands_cc_proto",
         "//protocol:renderer_cc_proto",
+        "@com_google_absl//absl/log",
         "@com_microsoft_wil//:wil",
     ],
 )
diff --git a/src/win32/tip/tip_text_service.cc b/src/win32/tip/tip_text_service.cc
index e328192c4..3b363d69e 100644
--- a/src/win32/tip/tip_text_service.cc
+++ b/src/win32/tip/tip_text_service.cc
@@ -45,10 +45,10 @@
 #include "absl/base/casts.h"
 #include "absl/container/flat_hash_map.h"
 #include "absl/functional/any_invocable.h"
+#include "absl/log/log.h"
 #include "base/const.h"
 #include "base/file_util.h"
 #include "base/log_file.h"
-#include "base/logging.h"
 #include "base/process.h"
 #include "base/system_util.h"
 #include "base/update_util.h"
@@ -206,7 +206,8 @@ commands::CompositionMode GetMozcMode(TipLangBarCallback::ItemId menu_id) {
     case TipLangBarCallback::kHalfKatakana:
       return commands::HALF_KATAKANA;
     default:
-      DLOG(FATAL) << "Must not reach here.";
+      DLOG(FATAL) << "Unexpected item id: " << menu_id;
+      // Fall back to DIRECT in release builds.
       return commands::DIRECT;
   }
 }
@@ -226,7 +227,7 @@ std::string GetMozcToolCommand(TipLangBarCallback::ItemId menu_id) {
       // Open the about dialog.
       return "about_dialog";
     default:
-      DLOG(FATAL) << "Must not reach here.";
+      DLOG(FATAL) << "Unexpected item id: " << menu_id;
       return "";
   }
 }
diff --git a/src/win32/tip/tip_ui_element_conventional.cc b/src/win32/tip/tip_ui_element_conventional.cc
index c7b35d19b..9b2ff8133 100644
--- a/src/win32/tip/tip_ui_element_conventional.cc
+++ b/src/win32/tip/tip_ui_element_conventional.cc
@@ -37,7 +37,7 @@
 #include <memory>
 #include <utility>
 
-#include "base/logging.h"
+#include "absl/base/optimization.h"
 #include "base/win32/com.h"
 #include "win32/tip/tip_dll_module.h"
 #include "win32/tip/tip_text_service.h"
@@ -145,8 +145,7 @@ class TipCandidateListImpl final
       case TipUiElementConventional::kCandidateWindow:
         return TipUiElementDelegateFactory::kConventionalCandidateWindow;
       default:
-        LOG(FATAL) << "must not reach here.";
-        return TipUiElementDelegateFactory::kConventionalCandidateWindow;
+        ABSL_UNREACHABLE();
     }
   }
 
diff --git a/src/win32/tip/tip_ui_element_delegate.cc b/src/win32/tip/tip_ui_element_delegate.cc
index 81e84a7a4..c401e45c4 100644
--- a/src/win32/tip/tip_ui_element_delegate.cc
+++ b/src/win32/tip/tip_ui_element_delegate.cc
@@ -33,12 +33,15 @@
 #include <atlstr.h>
 #include <msctf.h>
 #include <wil/com.h>
+#include <wil/resource.h>
 
 #include <cstddef>
 #include <memory>
 #include <string>
+#include <string_view>
 #include <utility>
 
+#include "absl/log/log.h"
 #include "base/logging.h"
 #include "base/win32/com.h"
 #include "base/win32/wide_char.h"
@@ -467,7 +470,7 @@ class TipUiElementDelegateImpl final : public TipUiElementDelegate {
     std::wstring msg;
     switch (status.mode()) {
       case commands::DIRECT:
-        DLOG(FATAL) << "Must not reach here.";
+        DLOG(FATAL) << "Unexpected last output status mode: DIRECT";
         break;
       case commands::HIRAGANA:
         msg = L"\u3042";