Highschool DxD: The Heavenly Dragons

Two brothers, Y/n and Issei Hyoudou. Issei Hyoudou died when he encountered a fallen angel. Issei got reincarnated as a devil but Y/n volunteered to join in order to protect his brother from enemies. But the two of them didn't know the power that's within them. The power that can rival or even kill God himself (Pictur...