Hi
First make sure you are logging in to an admin account or account with admin privileges.
Make sure you have installed the Japanese language pack and it is showing under your settings.
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If you need help with this there are tutorials on this site and other sites.
https://f95zone.to/forums/tools-tutorials.17/
e.g.
You must be registered to see the links
Then make sure you have downloaded the local emulator from here.
https://f95zone.to/threads/how-to-run-japanese-games-on-windows.1040/
You must be registered to see the links
Follow the instructions for setup / install
Restart your PC.
Now for the game, right click -> select show more options -> Local Emulator -> run in Japanese
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It should work now. Also on a side note, sometimes launching with "run in Japanese" does not work the first time and the screen will just flicker for a second, in those cases launching it a second time using "run in Japanese" seems to work.
hope this helps