I keep getting this error even after changing he region of my system. Funny enough, some other japanese games that i have only open when i set in my country region.But not yhis one. Help would be appreciated
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Judging from the titlebar of that application and from the (????) in the path, probably there are file names somewhere in one of the game's subfolders that are corrupt.
The first thing to try, though, is to move the game's folder to a directory that doesn't have special characters (like the a with the tilde diacritic in your name). Try something like c:\temp\
If you have the original compressed archive that the game was packaged in, try extracting it with 7Zip or WinRar. Sometimes certain decompression programs mess up the filenames when they're extracting an archive.
It's also possible that the archive was packed originally with the filenames corrupted. You might have to get the game from a different source if that's the case. If you open the archive in 7Zip and the filenames are messed up in there (like, you go in the BGM or images folders and see garbage instead of Japanese characters) then that's probably what happened.