High School DxD: A different Reality

Alternative Universe, an Alternative issei. This is a story about African American boy that grew up in Chicago's Southside. Going by his name quicksilver, due to being known as a notorious assassin all through the south side of Chicago, Illinois. One day, a Gang member took his revenge, by finding his brother and mother's location, then Gunning them down. His heart turning black, by the day, and only obsessed and killing the person that took his brother and mother away. But those plans were quashed when he pops come back into his life and told him that he was moving to Japan with him.
This story is not based on real Gun violence off of Chicago gang war, but inspired by them, and the tragedy... NO Issei Bashing or Rias bashing, Issei doesn't exist in this story