The Devil In I(DxD x God of High School)

Mori had always sided with no one during the 3 way war. He had always respected and never messed with God, and God left him be. He killed who he wanted, except for angels. but one day, the king of devils, Lucifer, created a Taboo insisting that Mori can't get more powerful than a high class devil. Mori's supernatural race? God of Martial Arts, War, and Violence.