While returning home from shopping, Ayako is mugged by a homeless man who snatches her bag, causing her to fall and injure herself. Her husband, Takayuki, supports her through the shock and anxiety, unable to recover from the trauma. A few days later, the mugger uses the stolen house keys to break into their home, assaulting Ayako both violently and sexually. This incident leaves a deep psychological scar on Ayako and creates a significant rift in their marriage. The shocking events set off a story that tests the very foundation of their relationship.