Aiyu, the excellent student serving as the vice-chairman of the class, heads to her classmate Nozomi's house to deliver some handouts and also to persuade her to attend school. During this visit, Nozomi's uncle invites Aiyu into the house. Once inside, she is locked in a room from the outside. Nozomi begins to assault Aiyu, treating her like an animal being fed. Further assaults continue from her uncle and brother, awakening Aiyu's masochistic tendencies, leading her to eventually desire pregnancy herself.
