Aya is a kind, conscientious married teacher working at the same school as her husband. Students adore her but dislike her husband, whose old-fashioned methods have left him out of touch. One afternoon he catches Kimura bullying Okamoto and, enraged by the adult student's attitude, strikes him. Aya defuses the confrontation, but Kimura remains furious and summons her alone. He threatens to report the corporal punishment and cost her husband his job unless she shows him her breasts, using blackmail to begin taking control of her.