1#: Did you install the game and are running it with system locale set to Japanese? If not then that might causing those issues.
2#: if that doesn't work and/or you're running Windows 10 I may have another solution tucked away somewhere.
I have Language for non-Unicode programs set as Japanese, I did it before doing anything about installing the game.
Also yeah, I do have Windows 10.
Sorry for the late-ish reply.
Anyhow, heres a patched dat folder (plus the exe included in the zip) that *might* work for Windows 10.
[REMOVED BY MODERATOR]
It's worked for a couple of other folks I gave it to (Which also had Win10-issues) so hopefully it'll be the same case here.

Otherwise: I have no clue.