Part 1: Birth of a monster.

Once a human, a 20 years old man is thrust into a brand new world, not as a man but as the strongest biological weapon ever created. Watch as the world witnesses the adventures of this man, how it reacts to BAOH. (This story will be a crossover, between Highschool DXD and BAOH. Don't hesitate to give your opinion, it helps me get better.)