Dxd: The Power to end the world

Before the story begins, there was a boy.
A boy by the name of Aiden who ran away from home after his family had a falling out after moving to Japan from america.

For 4 months he spent in the street, trying to find any food or shelter he can get but by then he was almost at deaths door, until on December 10th near an ally on the floor near the neighborhood, he was saved by a little girl with brown short hair named isa.

From that day his life became better and after a few years he goes to kuoh academy, a school that used to be for girls until it changed to an all out school.

He wished he only knew the world that he was thrust upon from that very day on that bridge.