Momo, a female student who serves as a member of the discipline committee, visits the home of her reclusive classmate, Yusei. However, a man named Hirai appears. He is an active yakuza who has been on friendly terms with Yusei's father, Kenta, since he was a member of the yakuza. He uses the house as an office and makes his living from it. Kenta, who is shown to Momo by Hirai, tells Momo that "Yusei is trash and you should stop meeting him," but Momo doesn't accept his words and ends up meeting Yusei. As soon as Yusei sees Momo, he pins her down and gang-rapes her. Then Kenta and Hirai join in...