The King of Heroes (Male Reader x Highschool DxD)

The Great War, the war between the strongest factions on the planet, Heaven, The Underworld and Grigori. The Underworld and it's devil's were losing the war and losing it badly, and after the loss of his eldest son Lucien, the current Lucifer, Zeoticus creates a last ditch effort in the attempt to tip the scale in the Underworld's favor, The Evil Piece System. With this system, Devil's can resurrect humans so they can become devils and can serve The Underworld's most elite, High-Rank Devils. But for this system to become a reality, there has to be a first, a first king piece. A young Fallen Angel boy who was rescued from the middle of a war zone and adopted by Zeoticus decided he wanted to repay his adoptive father for his kindness and volunteered to be the one to test the Evil Piece System, the First King Piece.