Sarina lives with her husband Nobuo and her father-in-law, Akinobu. Despite being unwell, Akinobu refuses to go to the hospital, leaving Sarina to care for him whenever her husband is away. Starved for physical warmth, Akinobu begins repeatedly touching Sarina's body, escalating into increasingly rough sexual acts. In this situation, Sarina finds it impossible to confess to her husband that she has been raped by her father-in-law.