After her divorce, Chieri lives with her son Taiichi in a cramped wooden apartment. Though poor, they lead a sufficiently happy life. However, Chieri accepted a marriage proposal from the store manager of her workplace, Tazoe. But Taiichi couldn't stand his mother being taken by another man. Just then, Taiichi returns home from his part-time job and witnesses his mother having sex with Tazoe… 'I won't let anyone have Mom!' And so, Taiichi begins to ravage his mother's body right beside Tazoe...
