Hello!
We've looked into the issue and it may be an issue with the tool you are using to unzip / unrar the game files.
Please try the steps below for a fix:
There is a possibility that something containing Japanese characters was not unzipped properly at the time of unzipping.
Use LHSA for the unzipping software.
LHASA can unzip Japanese fonts without any problem.
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If this doesn't fix the issues you are having, please reply again to this thread, and we will work something out!