Hёdo Issey - a sophomore high school, known in her as a weirdo loser. And he lives a normal life,but one day a beautiful girl invites him to meet... and kills him on the first date. But what happens if you think that it would be better to die on your lap the most beautiful girl of the school, Rias Gremory on the threshold between life and death? It is true, and it will turn you into a demon, and, concurrently, his servant! All right,Now you can continue to live, and a new dream can not hurt to have. For example, the dream of becoming the king `s harem?