Son-in-law, Koichi, who lives with his wife and her parents. He is interfered by his father-in-law to a daughter and her husband who are not blessed with children, saying, "What is going on with making children!" Koichi replied that he had no libido, but the real reason was that he was fascinated by his mother-in-law Yumi's obscene big breasts! Koichi's desire for grace reaches its limit and attacks the exposed big tits in the bath! Koichi's courtship escalates when his reason is blown away, and Yumi, who was left with her ripe body, also drowns in her domestic affair.
