Koichi, a son-in-law who lives with his daughter-in-law and his parents. - A daughter and her husband who are not blessed with children are interfered with by her father-in-law, saying, "What's going on with making children?!" I don't have a libido ... Koichi answered, 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 dew big while bathing! Koichi's courtship, where his reason has been blown away, escalates, and Yumi, who had a ripe body, drowns in domestic affair.