Suzu, a university student, is a private tutor for her childhood friend Urara, a female student. The two are as close as real sisters. One day, Suzu's boyfriend, Tetsugaku, sets his sights on Urara. Tetsugaku is a thug, and has been dating the innocent Suzu by half-deceiving her. He plots to offer Urara up to borrow money from his big brother, who has a sexual interest in female students... Before long, Suzu is also reduced to being used as a plaything for the thugs, and the curtain rises on a hellish gang rape orgy...