Human among devils (high school dxd harem x male oc)

People often ask: can humans coexist with peacefully with the supernatural? Some say yes but others don't agree. Toad Skywalker is married to the heir of the Gremory family Rias Gremory is the prime example of humans and the supernatural living peacefully. it happened after the death of Rias's former fiancé Riser Phenex and her former pawn Issei Hyodou for their crimes against both races. as for Toad, he has no sacred gear which suits his wife Rias and the rest of her peerage just fine. Despite being human, Toad can attract girls without even trying which earned him the title: harem king.