diff --git a/tomighty-swing/src/main/text/messages_ja_JP.properties b/tomighty-swing/src/main/text/messages_ja_JP.properties
new file mode 100644
index 0000000..b3254fb
--- /dev/null
+++ b/tomighty-swing/src/main/text/messages_ja_JP.properties
@@ -0,0 +1,57 @@
+# General
+Default = \u30c7\u30d5\u30a9\u30eb\u30c8
+Click.to.select.a.file = \u30af\u30ea\u30c3\u30af\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u3092\u9078\u629e\u3057\u3066\u304f\u3060\u3055\u3044
+Pomodoro = \u30dd\u30e2\u30c9\u30fc\u30ed
+
+# Tray message
+First.time.using.Tomighty? = Tomighty\u3092\u4f7f\u3046\u306e\u306f\u521d\u3081\u3066\u3067\u3059\u306d\uff1f
+Click.on.the.tomato.icon.to.start.using.it = Tomighty\u3092\u4f7f\u3044\u59cb\u3081\u308b\u306b\u306f\u30c8\u30de\u30c8\u306e\u30a2\u30a4\u30b3\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3057\u3066\u304f\u3060\u3055\u3044
+# Tray menu
+Options = \u30aa\u30d7\u30b7\u30e7\u30f3
+About = Tomighty\u306b\u3064\u3044\u3066
+Close = \u9589\u3058\u308b
+
+# About
+About.Tomighty = Tomighty\u306b\u3064\u3044\u3066
+
+# Options
+Save = \u4fdd\u5b58
+Cancel = \u30ad\u30e3\u30f3\u30bb\u30eb
+
+# Options / Times
+Times = \u6642\u9593
+Short.break = \u77ed\u3044\u4f11\u61a9
+Long.break = \u9577\u3044\u4f11\u61a9
+minutes = \u5206
+
+# Options / User interface
+User.interface = \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9
+Theme = \u30c6\u30fc\u30de
+Show.remaining.time.on.tray = \u30c8\u30ec\u30a4\u306b\u6b8b\u308a\u6642\u9593\u3092\u8868\u793a\u3059\u308b
+Auto.hide.window = \u30a6\u30a3\u30f3\u30c9\u30a6\u3092\u81ea\u52d5\u7684\u306b\u96a0\u3059
+Allows.dragging.the.window.around = \u30a6\u30a3\u30f3\u30c9\u30a6\u3092\u30c9\u30e9\u30c3\u30b0\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b
+Brushed.metal = Brushed Metal
+Gradient = Gradient
+Shiny = Shiny
+Grainy = Grainy
+
+# Options / Sounds
+Sounds = \u30b5\u30a6\u30f3\u30c9
+Enable.wind.sound = \u306d\u3058\u5dfb\u304d\u306e\u97f3
+Enable.tic-tac = \u79d2\u91dd\u306e\u97f3
+Enable.ding.sound = \u9418\u306e\u97f3
+
+# UI states
+Start.pomodoro = \u30dd\u30e2\u30c9\u30fc\u30ed\u3092\u958b\u59cb
+New.pomodoro = \u65b0\u3057\u3044\u30dd\u30e2\u30c9\u30fc\u30ed\u3092\u958b\u59cb
+Interrupt = \u4e2d\u65ad
+Pomodoro.interrupted = \u30dd\u30e2\u30c9\u30fc\u30ed\u306f\u4e2d\u65ad\u3055\u308c\u307e\u3057\u305f
+Pomodoro.finished = \u30dd\u30e2\u30c9\u30fc\u30ed\u304c\u7d42\u4e86\u3057\u307e\u3057\u305f
+Take.a.break = \u4f11\u61a9\u3092\u3068\u308b
+Short = \u77ed\u3044
+Long = \u9577\u3044
+Restart = \u6700\u521d\u304b\u3089
+Restart.pomodoro = \u30dd\u30e2\u30c9\u30fc\u30ed\u3092\u6700\u521d\u304b\u3089
+Break.finished = \u4f11\u61a9\u304c\u7d42\u4e86\u3057\u307e\u3057\u305f
+Break.interrupted = \u4f11\u61a9\u306f\u4e2d\u65ad\u3055\u308c\u307e\u3057\u305f
+Restart.break = \u4f11\u61a9\u3092\u6700\u521d\u304b\u3089