After remarrying, Mari has a stepson, and her husband, wanting her all to himself, fakes a random assault to attack the boy's father. During the father's one-month hospitalization, Mari and her stepson are left alone together. As the stepson aggressively draws closer, Mari is overwhelmed by uncontrollable desire and begins sexually serving him. However, the stepson's lust isn't satisfied, and he demands a physical relationship. Ultimately, she is forcefully taken by him.