you can use them in the main game (there's a club management game linked to the chapters) it will add the girl to the game
how do i know if the game needs to be updated? it says in 0.7 sylvia has her own room but in my version she doesn't so how to i copy my save file to update it?
you copy the 2 .SAV files from the folder, you go to the void gate and write update, every time you switch from a version to another one.
