A son-in-law is suffering because of his daughter's infidelity. Her girlfriend, Rui (Ayukawa Rui), who was told that fact, apologized because she had raised her badly, and she took down her son-in-law's pants on the spot. If it's piling up because of her daughter, she'll pull it out for her. That's the least she can do as a mother. Rui thought so and served with her mouth. However, the act that is too obscene will make her son-in-law hold a forbidden desire.
