You are Ms. Servant

Hitoyoshi is a high school student living by himself when a mysterious girl shows up at his door, offering to work as his maid. She has elegant black hair and refined manners, but beneath her polite demeanor lies a violent history as a trained killer. Though she’s terrible at domestic chores and her past is dangerous, Hitoyoshi decides to let her stay. As she settles into ordinary life, emotions she never knew start to awaken within her.