>>54383
I dont know how to help you aside from telling you the steps I did.
1. Download game zip files (dont unpack or touch them)
2. Get language pack, and change language to Japanese.
3. Change localization
4. Restart
5. Unpack and mack sure all bmp/char files are intact with japanese chars
6. Run game (make sure your up to date with windows .NET and C++ redistributables) and hit Z to start.

I always use a VM for this kind of stuff, so I can only vouch for its effectiveness in that department.