It will be adapted into an anime series in January 2012. Prior to the premiere episode of the anime that was released last December 2011.
A second grader High School Issei Hyodo has a very stubborn, who leads a quiet life until he was called for a date with a girl named Yuuma Amano aka "Rias Gremory". When it gets dark the girl takes him to a secluded spot where he shows his true form. She's a fallen angel and plans to assassinate him. He dies, Since no one can save Issei.
When he awakens, he discovers that he has reincarnated as a demon, and from that day Issei works as a servant of Gremory Rias, a high level demon girl who happens to be the most beautiful and popular in school.