Water Moon Arisu was once involved with an older man when she was younger. However, his possessiveness and selfishness became too much for her to handle, leading her to leave him behind. She later married a man close to her age and found happiness in their relationship. But fate had other plans when her ex-lover unexpectedly reappeared before her eyes one day while she was out shopping with her husband. Despite trying not to get caught up in old feelings or involve her husband in any drama, Arisu couldn't help but feel drawn back towards the older man who still held some allure over her heart despite everything that happened between them years ago...

「ありす」は年上好きで昔オヤジと付き合っていた。しかし、束縛が激しく自分勝手なオヤジがキモくなり逃げた。その後、同い年の彼氏と結婚。幸せだった。しかし、オヤジが「ありす」の目の前に現れた。夫を巻き込みたくないと言いなりになる「ありす」。そして夫とオヤジが揃って彼女の前に現れ衝撃の事実を告げるのだった。