A high school student named Hitoshi Yokoya has an unexpected visitor at his home: a maid with black hair, a pristine appearance, and a polite manner of speaking. Her first words are, "Please hire me." She used to be an "assassin" and her claimed talent is "assassination," but she is completely inexperienced with household chores, and is a "clumsy" novice.
Thus begins a cohabitation under the same roof with the maid from this fateful encounter…!? As time goes on, the maid’s heart, which has never known emotions, begins to waver.
This is the story of how a lonely maid finds a "family."