A high school student named Hitoyoshi Yokoya lives alone, unaware of his fate when he's approached by an enigmatic girl who offers him the role of his maid. She is revealed to be a former assassin with unparalleled skills. After narrowly escaping a near-death experience, Hitoyoshi decides to accommodate her in his life. Despite her limited domestic abilities and lack of social skills, Yuki begins to yearn for normalcy, prompting her to seek out a more fulfilling existence. As she embraces new emotions and forms close bonds with Hitoyoshi, Yuki aims to shed the shadows of her past and create cherished memories alongside him.
A mysterious maid suddenly shows up at Hitoyoshi Yokoya's doorstep, inquiring...