A boy just moved in another appartment and what to see? A girl just trapped in the house names Erina and clame to be the zashikiwarashi ot that room (meaning a child ghost that lives within a specific house). That girl is misterious and keep calling him master. And what the master to find out? The girl is readin and interesting book named: "How to be a maid to make the boy of your dreams fall for you".