The Mitarai family are wealthy and they have run a hospital for generations. One day, their home burns down in a fire. 13 years later, Anzu Murata (Mei Nagano), from a housekeeper agency, is hired by Makiko Mitarai (Kyoka Suzuki). She is the second wife of Osamu Mitarai. Anzu Murata soon begins to work at the Mitarai’s home as a housekeeper. She has a secret purpose to work in their home.