diff --git a/configuration.nix b/configuration.nix
index 194676b..8a8bdf1 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -55,6 +55,13 @@
     LC_TIME = "en_US.utf8";
   };
 
+  # Japanese IME.
+  i18n.inputMethod = {
+    enabled = "fcitx5";
+    fcitx5.waylandFrontend = true;
+    fcitx5.addons = with pkgs; [fcitx5-mozc fcitx5-gtk];
+  };
+
   # Enable sound with pipewire.
   security.rtkit.enable = true;
   services.pipewire = {
diff --git a/modules/desktop/hyprland/config.nix b/modules/desktop/hyprland/config.nix
index 5528d95..c3c81ab 100644
--- a/modules/desktop/hyprland/config.nix
+++ b/modules/desktop/hyprland/config.nix
@@ -270,6 +270,9 @@ in {
     # Change background.
     bind=SUPERSHIFT,K,exec,killall -q swaybg -9; swaybg -i "$(find ~/Pictures/Wallpapers -type f | shuf -n 1)" -m fill
 
+    # Japanese IME.
+    exec-once=fcitx5
+
     # Start some applications in the background.
     exec-once=~/.config/hypr/autostart.sh
   '';