I ran it on Windows 11; all I needed was a standard Japanese locale emulator and to set the .exe to Windows XP compatibility mode, and it worked fine.
P.S. I'm getting errors now, even though I haven't uninstalled or reinstalled the game—it seems like a Windows update broke something.
P.S.S...
Link in the comments
https://www.anime-sharing.com/threads/040227-us-wu-fsn-%E3%81%84%E3%81%A4%E3%81%8B%E9%99%8D%E3%82%8B%E9%9B%AA-%E5%88%9D%E5%9B%9E%E7%89%88.25314/