According to Fujimishobo, Ishibumi Ichiei's light novel "Highschool DxD
" was announced to be getting an anime adaptation.
Highschool DxD novel official website
A manga adaptation has been serialized in Monthly Dragon Age.
Hyodo Issei is a (pervert) high school boy. When he goes out on a date with his first girlfriend Asano Yuma, he is killed by her. Her true identity is Reinare, a fallen angel sent by a secret society Grigori to eliminate dangerous divine weapons. Issei is reincarnated as a devil by his senpai Rias Gremory, a Duke of Hell. Issei serves as Rias's low rank devil and fights against the fallen angels.