diff --git a/src/locales/ja/egg.json b/src/locales/ja/egg.json
index 91b1442c56c..42cd59cb6a8 100644
--- a/src/locales/ja/egg.json
+++ b/src/locales/ja/egg.json
@@ -11,6 +11,7 @@
   "gachaTypeLegendary": "伝説確率アップ",
   "gachaTypeMove": "レアなタマゴ技確率アップ",
   "gachaTypeShiny": "色違い確率アップ",
+  "eventType": "Mystery Event",
   "selectMachine": "ガチャマシンを選択",
   "notEnoughVouchers": "タマゴクーポンが足りません！",
   "tooManyEggs": "タマゴが一杯です!",