Anzu Murata snuck into the Mitarai residence under the guise of a housekeeper in order to ascertain the truth behind the fire 13 years ago – a fire for which her mother took all the blame. Sneaking behind the back of Makiko Mitarai, the harsh second wife of her father, Anzu expands her search of the house up to the forbidden second floor. There, she meets a suspicious shut-in and, thinking to take advantage of him, she attempts to make contact with him. But because of a certain mistake, she brings down Makiko's wrath...!