Exhausted by the daily grind of housework, childcare, and work, a man is suddenly confessed to and kissed by Konatsu, a teacher at his child's nursery school. He casually agrees to an affair and they become intimate, but her love proves to be far more intense than he imagined. She begins to intrude on his private life, seizing opportunities when his wife is absent to enter his home for sex and demand he get a divorce. By the time he realizes the gravity of the situation, it's too late. Beneath her outwardly cute and gentle demeanor lies a powerful sexual desire and obsession. Her passionate kisses and voluptuous body begin to melt his reason, trapping him in the affair.