Nozomi, a married woman repeatedly betrayed by her unfaithful husband, gradually lost all affection for him. She eventually poured all her emotions into her son Souta, cutting ties with her husband completely. Having witnessed his mother's suffering for so long, Souta began to feel intensely: "I'll replace that despicable father!" The deep bond between mother and son soon manifests in the forbidden form of incest. Their relationship, built upon love, desire, and past wounds, steadily moves toward an irreversible conclusion.