sorry, sir, that won't be possible :') .
you have to follow the main path to unlock every girl. some are unlock soon and some need a little of progres in main path.
stuck at school mission get tickets for brandy ,i got to the exchange and got robbed for 300bucks it says and i quote "she should help jason" and now i can't to anything else the book of faces keps saying to to school missionsso what did i do wrong was someone i should have talked to before meting jason to get the tickets or someone after he runs after the thief