There was a student, Kota, who did not attend school in the class that Arisa, a female teacher, was in charge of.Ema and Arisa, the class representatives, are worried about Kota and visit his house, but it turns out that Kota was a brutal man who caught bad friends and women and did lewd acts.Arisa and Ema are caught like a butterfly on a spider's thread and fall into the hands of Kota, his family, and his bad friends.Continued to be circled, the two lost their sense of self, and eventually became sex slaves.