Second wife's child, Yui is now a 21-year-old mature woman. Her father-in-law has also come to be conscious of her as a woman. On the other hand, Yui sympathizes with her father-in-law, who is treated coldly by her second wife, and the two of them somehow get along. One day, her father-in-law sees Yui masturbating. Even though she has a boyfriend, she is attracted to her father-in-law, and she finally forgives her body. The two fall in love despite the obstacles of her second wife and her nephew.
