Ainana, who has been married to her husband for seven years, barely has any evening life or conversation with him due to his busy schedule. When Ainana invites her husband to exercise, she is suggested to go to a swimming class where her friend Ichijou is the coach. Although Ainana is happy about it, her husband retires from the swimming class after a few sessions. Complaining to Coach Ichijou about her husband becomes routine. On the night of their wedding anniversary, Ainana is shocked when her busy husband cancels their dinner plans. She naturally thinks of Ichijou's face and before she knows it, she finds herself at the pool…
