After losing her husband, Mitsuyo Shono began living with her daughter and son-in-law. One day, she accidentally caught her son-in-law masturbating. Seeing his male body stirred long-dormant desires within her, and she found herself alone late at night, touching herself while thinking about him. She went to wake him up, but the drowsy son-in-law pulled her close and attempted a deep kiss. Flustered, he pulled away and apologized—only for Mitsuyo to whisper, "Was it my fault for disturbing you?" as she gently ran her hands over his body, signaling the beginning of a forbidden relationship...