Husband and wife Kengo and Hitomi live a peaceful, quiet life. One day, while enjoying dinner together, two of Kengo's former coworkers appear at the restaurant. They explain they've left the company to start a house cleaning business, and the couple hires them for a home cleaning service. That night, the two men arrive at their house, and suddenly, Hitomi is violently assaulted. Trapped in a locked room, she is forced to endure their brutal acts, fueled by the men's deep-seated resentment toward Kengo.