Hello! This is SugarChip! I can't find my original sign-in account and I definitely don't have the original game flies anymore. If you want to play. You have to download the songs:
Perfume - だいじょばない (Daijobanai) -Original Instrumental-
Make sure they're MP3 flies. After that go to:
4DaysWB --> 4Days ---> Audio ---> BGM
Put the audio files in the BGM file. Close and open the game and it should work. Don't change the title of the songs or it won't work. I don't know if anybody's interested anymore but here you go.