Kanna works as a dispatched housekeeper, but her current assignment is to a mansion with an eerie atmosphere. The job request came from a father and son living alone. Upon arrival, Kanna is forced to change into a maid outfit. Both the son and the master of the house act strangely, and she senses there's some hidden reason behind the absence of a mother. However, no one offers any clear explanation. Though suspicious, she begins her duties, only to be scolded by the master: "Why aren't you calling me 'Master'? Follow the rules of this household!" The story unfolds with mounting tension and mystery, capturing the unsettling atmosphere, unnatural vibes, and Kanna's inner turmoil.