Ryo, who remarried a man with a child from a previous marriage, took in his son when he was still very young and raised him as her own. Over time, the boy discovered the shocking truth that he was not her biological child. This revelation sparked forbidden feelings toward Ryo, eventually leading him to sexually overpower her. Unable to confide in her husband or anyone else, Ryo is repeatedly forced into submission by her stepson. Torn between guilt and pleasure, the married woman struggles emotionally as she succumbs to an illicit incestuous relationship, heading toward an inevitable, taboo conclusion.