The Hellbourne Exorsist

Azure Des is a puppet, a demonic feeding tool that keeps demons lached to earth, for without them demons couldn't survive in our realm. In an extremely unlikly encounter with a dying man named Ceil Ryder, his whole life changes when he disocvers that there is a way to become free of his restraints of being a puppet by becoming an exorcist, but Ceil has left some holes in the story. Why did he call Azure young hellbourne? Why was he in the demonic realm in the first place when no human should be able to enter it? Azure must figure out all these answers and put together the secrets one by one to figure out who Ceil Ryder really was, and more importantly, who he himself is.