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With her husband working away from home and her son busy studying for exams, Hisayo is lonely and comforts herself by masturbating. Her son's friend witnesses this and becomes aroused, and rapes her. Another friend hears the incident and approaches Hisayo, who then has sex with her. Out of her son's sight, Hisayo's friends use toys on her, and she endures, trying to hold back her voice. With her son away, she is suddenly thrown into an orgy with young men...