One day, a maid arrives at high school student Hitoyoshi’s home and asks to be hired. Her former job was assassin. Assassination is her specialty, but she knows nothing about housework. Though confused by her request and initially turning her down, Hitoyoshi changes his mind after she saves his life. As he discovers the purity of her heart, the two begin an unusual life together. This is the story of a former assassin maid learning emotions for the first time, and of a lonely woman who finally finds a family. A bittersweet yet heartwarming daily life begins.