in windows parameter where you can change your local setting to japanese in region on the top right corner you should have something saying you can have more option click on thatI seem to be getting a severe syntax error. The game completely fails to launch and all of the redmes are complete gibberish.
then go on region, then admin there you should be able to change your local in japanase. hope it help you
sorry for the bad english my computer is in french so i translated as best i can