Izumi Sawatari and her sister, Mitsuki, are currently searching for jobs after leaving their home. Unfortunately, their options are scarce, and the only option available to them is to work as domestic helpers in the luxurious household of a 14-year-old millionaire, Yoshitaka Nakabayashi. Despite initially seeming like an easy job, the sisters quickly realize that Yoshitaka is a demanding boss who requires them to address him as "Master."