diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 680d22bc..51d952a1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,13 +14,14 @@ jobs:
       NDK_VERSION: "25.2.9519653"
       CMAKE_VERSION: "3.22.1"
       ANDROID_PLATFORM: "23"
+      MOZC_SHA: ad0e97b8b8dcfd4c841a02c5d6a043fb5e741405
 
     steps:
       - name: Install build dependencies
         run: |
           pacman -Syu --needed --noconfirm \
             git unzip ghc cabal-install haskell-shake haskell-aeson-pretty \
-            cmake extra-cmake-modules ninja fmt fcitx5 boost python opencc jre-openjdk gperf
+            cmake extra-cmake-modules ninja fmt fcitx5 boost python opencc jre-openjdk gperf bazel
 
       - name: Fetch source code
         uses: actions/checkout@v4
@@ -36,11 +37,27 @@ jobs:
           # fetch libime submodule kenlm since it's not in .gitmodules
           git submodule update --init --recursive libime
 
+      - name: Fetch mozc
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+          repository: google/mozc
+          path: libmozc/mozc
+          ref: ${{ env.MOZC_SHA }}
+
       - name: Setup Android NDK
         uses: android-actions/setup-android@v3
         with:
           packages: "ndk;${{ env.NDK_VERSION }} cmake;${{ env.CMAKE_VERSION }}"
 
+      - name: Build mozc_data.inc
+        run: |
+          git apply --directory=libmozc/mozc/src/third_party/protobuf libmozc/patches/protobuf.patch
+          cd libmozc/mozc/src
+          useradd -m builduser
+          chown -R builduser:builduser .
+          sudo -u builduser JAVA_HOME=/usr/lib/jvm/java-21-openjdk bazel build --config oss_linux --host_cxxopt=-Wno-uninitialized //data_manager/oss:mozc_data.inc
+
       - name: Build everything
         env:
           ANDROID_NDK_ROOT: ${{ env.ANDROID_HOME }}/ndk/${{ env.NDK_VERSION }}
diff --git a/.gitmodules b/.gitmodules
index 25500b88..a70b4e45 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -66,3 +66,6 @@
 [submodule "libiconv"]
 	path = libiconv
 	url = https://git.savannah.gnu.org/git/libiconv
+[submodule "libmozc"]
+	path = libmozc
+	url = https://github.com/fcitx-contrib/fcitx5-mozc
diff --git a/README.md b/README.md
index 76a51ce7..a240cd92 100644
--- a/README.md
+++ b/README.md
@@ -36,3 +36,4 @@ Cabal is required to build this project.
 * libchewing: [chewing/libchewing](https://github.com/chewing/libchewing)
 * libthai: [tlwg/libthai](https://github.com/tlwg/libthai)
 * libiconv: [GNU/libiconv](https://savannah.gnu.org/projects/libiconv)
+* mozc: [google/mozc](https://github.com/google/mozc)
diff --git a/libmozc b/libmozc
new file mode 160000
index 00000000..5580d540
--- /dev/null
+++ b/libmozc
@@ -0,0 +1 @@
+Subproject commit 5580d540d61e873033671e3d3af3e4fff51bd91d
diff --git a/prebuilder.cabal b/prebuilder.cabal
index 77e672df..177dab50 100644
--- a/prebuilder.cabal
+++ b/prebuilder.cabal
@@ -35,6 +35,7 @@ executable prebuilder
     Rules.LibIMEJyutping
     Rules.LibIconv
     Rules.LibIntlLite
+    Rules.LibMozc
     Rules.LibRime
     Rules.LibThai
     Rules.Lua
diff --git a/src/Main.hs b/src/Main.hs
index 20451147..e4257abd 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -26,6 +26,7 @@ import Rules.LibHangul
 import Rules.LibIME
 import Rules.LibIMEJyutping
 import Rules.LibIntlLite
+import Rules.LibMozc
 import Rules.LibRime
 import Rules.LibThai
 import Rules.Lua
@@ -71,6 +72,7 @@ main = do
       libthaiRule
       libiconvRule
       anthyDictRule
+      libmozcRule
       isInGitHubActionRule
       getOutputDirRule
       "everything" ~> do
@@ -90,6 +92,7 @@ main = do
                 "yaml-cpp",
                 "leveldb",
                 "marisa",
+                "libmozc",
                 "librime",
                 "libhangul",
                 "chewing-dict",
diff --git a/src/Rules/LibMozc.hs b/src/Rules/LibMozc.hs
new file mode 100644
index 00000000..9563121c
--- /dev/null
+++ b/src/Rules/LibMozc.hs
@@ -0,0 +1,35 @@
+{-# LANGUAGE DeriveAnyClass #-}
+{-# LANGUAGE DeriveGeneric #-}
+{-# LANGUAGE DerivingStrategies #-}
+{-# LANGUAGE RecordWildCards #-}
+{-# LANGUAGE TypeFamilies #-}
+
+module Rules.LibMozc where
+
+import Base
+import CMakeBuilder
+
+data LibMozc = LibMozc
+  deriving stock (Eq, Show, Typeable, Generic)
+  deriving anyclass (Hashable, Binary, NFData)
+
+type instance RuleResult LibMozc = ()
+
+libmozcRule :: Rules ()
+libmozcRule = do
+  buildLibmozc <-
+    useCMake $
+      (cmakeBuilder "libmozc")
+        { preBuild = BuildAction $ \_ src -> do
+            cmd_ (Cwd src) "cmake -B build -G Ninja -DCMAKE_BUILD_TYPE=Release -DBUILD_MOZC_ADDON=OFF"
+            cmd_ (Cwd src) "cmake --build build --target protoc",
+          cmakeFlags =
+            const
+              [ "-DPROTOC_EXECUTABLE=../../build/protoc",
+                "-DCMAKE_CXX_FLAGS=-I../../libmozc/mozc/src/bazel-bin",
+                "-DBUILD_MOZC_ADDON=OFF"
+              ],
+          postBuildEachABI = BuildActionABI $ \_ BuildEnv {..} -> do
+            cmd_ (Cwd buildEnvBuildDir) Shell "ar rc" (buildEnvOutPrefix </> "lib" </> "libabsl.a") "$(find mozc/src/third_party/abseil-cpp -name '*.o')"
+        }
+  "libmozc" ~> buildWithAndroidEnv buildLibmozc LibMozc