A married woman, Iori, works as an instructor at a swimming school. Her relationship with her husband has cooled significantly since their early days of marriage, and swimming in the pool is her only way to relieve stress. Around that time, her husband brought home his subordinate, Sugimura, who started attending the swimming school at her husband's suggestion. Iori, who usually teaches children, starts to notice Sugimura as a man due to his muscular build. The same goes for Sugimura; he sees Iori in her swimsuit as a woman and forgets that she is married, crossing the lineー
