There was a girl who just moved to tokyo or city from the country side leaving a boy. The moment she reach the university she joined a club and was force to have sex with at least 2 different people from the group after getting drugged i think. Then she kept getting screwed over till her mind broke and the final part was when the boy came over from the country side he saw her getting fucked and she say the only way to save her is to fuck her to the boy.