The Terasaki family's toilet suddenly breaks down. Izumi, the mother, stays with the repairman, but she suddenly has to urinate and is on the verge of incontinence. Izumi urinates in the garden of their house, but her son Keisuke witnesses the scene. Keisuke becomes aroused by his mother's lewd and shameful appearance and cannot control himself, so he attacks his mother who is taking a nap.