College student Suzu is a tutor for her childhood friend, Urara.They were just like her real sisters.One day, Suzu's boyfriend, Philosophy, catches sight of Urara.Philosophy is a thug, and he half deceived the innocent Suzu to date him.In order to borrow money from her older brother, who has a sexual interest in female students, she schemes to offer her back.Before long, Suzu is also degraded as a plaything for her peers, and the curtain rises on the ring of sake pond hell.