After remarrying, Azumi falls into an affair with her stepson, Yousuke. Despite being married to Kouichi, a divorced man, she cannot stop her physical relationship with Yousuke, which takes place in close proximity—behind his back or in hidden corners. Driven by forbidden desire, the two continue their illicit bond, unable to break free. The tension of nearly being exposed intensifies their passion, stirring excitement and anticipation with every risky encounter.