You are Rias Twin Brother. Disclaimer I don't own Highschool dxd or the Pictures or other Animes, Manga, Videogame elements in this Fan Fiction. The only things I own are my ideas.

The grim reaper has been around for a long every death he has judged and taken the souls of that person but after the great war the devil's have interrupt his work and he has been looking for for the source of dead people turning into devil's and he has found and is not happy about what the devil's have been doing