Devils, Angels, and a Gamer

Vincent Lane, once had a boring life, now finds himself as The Gamer in Kuoh Academy. Now's he's got several things on his to do list: Survive, help Rias and her Peerage, and completely screw over any and all opposition to the safety of his friends and perhaps some other people. Now if only he could figure out where to draw the line on this harem he's getting. OCxHarem, IsseixHarem