Kimi wa Meido-sama.

Hitoyoshi Yokoya is a high school student his life suddenly changed when a girl came into his life. A mysterious girl with an attractive look came to his door and offered him to be his maid. She is an assassin. She saved his life from an accident so he agreed to it. As Hitoyoshi lived alone and now he has a homie. She knew nothing except killing people. She tried her best to be like an ordinary girl. She learn a lot of new things that she never experienced as a killer. Now they get attached. Hitoyoshi gave him a new name Yuki. Yuki is now finally able to call someone her family and forget her past.