DxD: King Of Summoning

Rey, a half devil-human boy from the hidden Devil family, Rofocale. One day, his Mother was killed. But, he who's just a little boy was too weak to avenge her, and so he was almost killed too and dying. But then.... Author's note: This is not a DxD fanfic with a reincarnated or transmigrated MC! MC is original character born and raised in the DxD World! And there is no OP System-thing too! Sorry if my grammar not really good. English is not my first language, so please forgive. Even so, I will try my best! Other title: DxD: Rey of the Summoning, DxD: Rey The Summoner