Hmm... Not this sort of information. Is the locale of your PC in japanese to begin with?
Follow the format of posting I'll post below. Otherwise it's kinda impossible to help you.
Here's the format you should post in:
Are you running your computer with Non-Unicode Japanese? (link to instructions): Yes/No
Game:
Description of Problem:
Your Operating System:
64 or 32 bit (link to how to find):
What did you already try? (Uninstall/Reinstall, Redownload, Run as admin, etc):
Did you download your game from Fuwanovel?
The format was taken from this thread:
And it will make your life and everyone else's much easier if you read the pinned threads before posting. Yeah, I know it's boring but there's usually a good reason for they being pinned.
PS: I guess I sounded kind of rude above. Sorry if that's the impression I'm giving. I'm just trying to help you, seriously. XD