Changing your locale is quite simple actually. You don’t need any emulators (I tried the guys one above, it didn’t work for me) but follow these steps and you’re good. - Did you change the FORMAT to japanese? or the real administrative SYSTEM LOCALE tab?
(FOR Windows, if its not on them then search the web on “how to change SYSTEM locale {your pc type}”)
[https://www.java.com/en/download/help/locale.html]< link for steps on windows 7,8,10, Vista and XP
[guide provided should cover those (W 10, XP, etc) all but wording may vary a bit]
1. Go to your control panel
2. Click on “Clock and Regions”
3.Click on “Regions”
4. In “Regions” Click the administrative button (Should be on top)
5. Change system locale to Japan (you might be required to restart)
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[Extra steps I did that may also be required]
6. Change the format to Japanese
7. Go to “Date and Time” and set to Japanese (in “Clock and Regions”)
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8. Play the game :) Hopefully this helps!