wife's mother

It has been 8 years since her husband died, and Fuyuko (Izumi) lives with her daughter and her husband and is in charge of the housework, leading a happy life. Her only joy was that her daughter and her husband would have a child and become a young grandmother. However, there is no sign that she will be able to have a child. The daughter, Mizuna, is unable to live up to her mother's expectations and gradually becomes depressed. Eventually, her heart breaks and she comes up with the idea of ​​using Fuyuko as a surrogate mother, and assigns men to try to revive Fuyuko's sexuality. And finally with my son-in-law, Akio...