Wife Ayano lives a quiet life with her scholar husband, Motosada, and his father, Tadao. One day, a small package arrives for her. Hesitantly opening it, she discovers an unfamiliar adult toy inside—a vibrator. Ayano grows aroused by the device's sensual movements—until suddenly, her father-in-law Tadao lunges at her. It was all part of Tadao's plan. Helplessly overpowered, Ayano is raped by her husband's father. Trapped between her husband and his father, she is drawn into a lewd double life. What fate awaits Ayano?