Haru got a phone call that forced him to go to a far away place and if he refused, his loved ones will die. The separation of the brothers lead them to insanity. They were always together and now Haru has gone away without telling anyone. What will happen? Where did Haru go to? Who would do such a thing as threat the Kaidous?
so basically Reverse flash in dxd and he has a giant hate for the good guys.
Mostly Issei. Issei will have the speed force, but It won't be important till season 2 of the book starts
(I own nothing in this story, please keep that in mind so i dont get copyrighted.)