It was a tennis club recommended by a mom friend to relieve lack of exercise, but Yuu, a married woman, becomes friends with a coach younger than tennis. She doesn't need troublesome bargaining with a married woman who has excess free time and libido, she easily brings the coach to her home and falls into a physical relationship. There is no way that her sweet relationship will end at once, and the next day she will bring a coach into her husband's unknown broad daylight and drown in her physical relationship. She doesn't know that the manager is watching her...
