This role-play is performed by adults. A forbidden love story between Mayumi, a mother who is treated like a servant by her husband, and her son who feels sorry for her. Her son's marriage has been decided, and Mayumi spends her days clutching her son's underwear and masturbating to distract herself from her lonely feelings. On the very day her son leaves home to live with his fiancée, his mother, Mayumi, is unable to suppress her feelings and takes action...