An exclusive Takara Eizou production featuring Yuka Mizuno! After losing her husband at a young age, Yuka lived with her daughter and son-in-law. She got along well with her daughter's husband, Jun, and lived a simple but happy life. One day, Yuka witnessed her daughter and Jun arguing about sex. It seemed her daughter was bad at sex and kept refusing Jun even when he wanted it. Worried, Yuka tried to talk to her daughter, but her daughter wouldn't listen to her. Then, by chance, Yuka happened to come across Jun while he was pleasuring himself. Surprised and agitated, Yuka took an unexpected action. "Since my daughter's responsibility is also my responsibility as a mother..." Yuka grabbed Jun's cock. It was supposed to be just a handjob at first... but soon it became a blowjob... and then full sex... Jun couldn't stop, and Yuka tried her best to resist, but...