Devilish conduit (powerful conduit male reader x highschool DxD)

There were many inmates at Curdan cay, too many for Augustine to keep track of them all, so she never knew her most powerful ally was right under her nose until she was too late. Now free a young conduit can finally breathe the open air once again, and shake the hand of his savior, he didn't know what that shake would do as not even he knew of his true potential. But now in a new city with new faces he now must battle new enemies, that which he would have never thought possible, and some old faces from another conduits past.