A married woman, Iori, who works as an instructor in a swimming class. Her relationship with her husband had cooled down since the beginning of her marriage, and swimming in the pool was her only way to relieve stress. At that time, her junior, Sugimura, who her husband brought to her house, will attend a swimming class at the recommendation of her husband. Iori, who usually teaches her children, is conscious of her muscular husband's junior, Sugimura, as a man. It's the same for Sugimura.
