You Are Ms. Servant.

A High school student, Hitoyoshi Yokoya lived alone after his family died in an incident. One day a strange thing happened to him and a girl knocked on his door. A young attractive girl was there and asked him to work as a maid in the house. She was an assassin and had a very bad past. Hitoyoshi agrees to accept her as his maid after she saves him from the truck accident. She knew nothing about house stuff and only knew about the assassination of the people. Now her entire life changed and she trying her best to become an ordinary girl and this made her feel good. She satretd to enjoy it and she once in her life finds someone who she called a family. He gave her a new name Yuki. Yuki now started to live like an ordinary girl and help him in his work.