After her only son left home, Reiko started going to the gym to enjoy her second life. There, she met her son's friend Akira by chance. One day, she was injured at the gym and Akira drove her home, where they ended up having a physical relationship... Since that day, Reiko has never been able to forget the intense thrusts of his strong body. From then on, every time she met Akira, she felt a tingling sensation in her crotch and began to have unrealistic expectations...