After her only son left home, Reiko started going to the gym to enjoy her second life. She then happens to meet her son's friend, Akira. One day, she got injured at the gym and asked Akira to send her to her house, where she happened to have a physical relationship with Akira. Since that day, Reiko can't forget the intense piston exchanges that came out of his muscular body. Since then, every time she meets Akira, she feels a tingling sensation in her crotch, and she begins to have unreasonable expectations.
