Highschool DxD Black

Issei's parents were killed by a group of devils when he was a child, with them about to kill him. However, he was saved by the Taimanin, ninjas who hunt devils. So what happens when Issei, who also trained to be a Taimanin, gets turned into a devil? Technically a crossover but the other series used is not in the listing. ABANDONED. COAUTHOR HAS LEFT FANFICTION PERMANENTLY.