VENU-800 Kyoko Kubo plays with her lewd father-in-law's wife who has retired and has free time.

Kyoko, a wife who has been living an ordinary but happy life with her husband for five years. - However, Kyoko also had one problem. - That is living with my father-in-law. - It was frustrating that I couldn't get closer to my stepfather, who doesn't talk much, and it was also creepy that I couldn't understand what he was thinking. - However, one day when her husband was late coming home, she heard her father-in-law's voice calling for her from the bathroom. - ``Kyoko-san, can you please wash my back?'' Kyoko was a little happy when her father-in-law asked her, but from that day on, Kyoko's happy married life began to be shaken up...