Hey Kazo, a friend of mine who is fluent on Japanese told me there's a typo in the japanese files, this one in particular (0000/0019.txt):
11) Save file is corrupt \xfffeさいせいを ちゅうだん します!
She translated the symbols and said they mean saiseiwo chiyuudan shimasu, which, according to her, means "anyone in the game named yuu"
What do you make of this guys?