High school Dxd: Alternate dragon

Issei Kannagi, an alternate universe version of Issei hyoudou, was betrayed by his universe's ORC, He trains for an unspecified amount of time becoming a powerful dragon. He travels to the canon universe to start anew. Where he meets canon Issei hyoudou who will be his mentee/rival. [Issei Hyoudou x Harem(Rias especially)], [Seekvaira A.x Issei Kannagi]. [New chapter in progress]