Tatsuya, who has a sex friend in Shinzo, a woman in her fifties he met on a dating site. Tatsuya and Shinzo have a purely physical relationship, and he is enjoying his sex life with her. Today too, they are indulging in each other's desires at Shinzo's house from noon... One day, while chatting about 'sex friends' with his friend Junpei, Tatsuya barks at Junpei, who is being toyed with by his younger sex friend, 'Of course, a mature woman is the best choice for a sex friend!'
