Aimi lived peacefully with her husband and her father-in-law, who required care—until tragedy struck. Her husband died in an accident, leaving Aimi alone with her grieving father-in-law. The unbearable loss twisted his mind, slowly warping his personality. His long-repressed deviant desires surfaced, and Aimi found herself helplessly drawn into his escalating madness. As her everyday life crumbles, what choice will she be forced to make?