Sent by a housekeeping agency to work at the Ueda residence while master Yuji Ueda is away on business, Chieko finds herself in an uneasy situation. Yuji has a son, Kenichi, who ignores Chieko's greetings and treats her with cold indifference. One day, loud noises erupt from upstairs, and when Chieko peeks into the room, she witnesses Kenichi being violently assaulted by his father. Shocked and disturbed, Chieko grows increasingly confused and anxious as she uncovers more about the household's dark dynamics. At that moment, Takeshi, Kenichi's half-brother, appears, revealing an even more complicated family web.