Hikari was living a happy married life when her husband's father, who had been out of contact, suddenly appeared. Her husband resented his father for abandoning his mother, but after Hikari's persuasion, he reluctantly agreed to let him stay for just one week. However, that decision was a huge mistake. The next morning, while Hikari was doing housework, her father-in-law suddenly attacked her. Her peaceful days with her kind husband were completely transformed by her father-in-law's sudden violence.