Tatsuya has a sex friend, Nobuko, a mature woman in her fifties whom she met on a dating site. With her Nobuko, Tatsuya was enjoying her sex life with Nobuko, with a relationship that was only her body. Today, she is at Nobuko's house and is greedy for each other's sexual desires from the daytime. One day, Tatsuya is having fun talking to her friend Junpei. Tatsuya yells at Junpei, who says that she is being tossed by a young sex friend, "If you want to be a sex friend, you should be a mature woman!"
