On his birthday, university student Bai XiaoShu suddenly receives a strange phone call from his father. Afterwards, he is inexplicably chased by people dressed in black who are intent on taking his life. Bai XiaoShu follows his father’s instructions and returns to his family residence. On the brink of death, he makes a contract with a devil. When he awakens, he finds himself face-to-face with an adorable girl who calls herself his maid. However, all of the strange events in his story... have only just begun...