Single mother Chisato struggles with her son Kenichi's reclusive lifestyle. Exhausted by his attitude, Chisato turns to his homeroom teacher, frequently inviting him for home visits in hopes of a solution. Yet Kenichi still shows no intention of returning to school. Seeing his mother fawn over the teacher, Kenichi trembles with rage and finally raises his hand against her. Is it jealousy toward the teacher, or punishment directed at himself for his wounded pride? The violence gradually evolves into a sexual relationship. As this progression unfolds, Chisato's demeanor begins to shift. No longer merely a mother, she transforms into a woman driven by new, awakening desires.