My series was just started but it has to do with the protagonist being reincarnated into fantasy world but this one is filled with demons and fiends..upon being born his new world parents were murdered after sacrificing themselves to save him, he is then left in the care of a woman who eventually kicks him out due to him being magic-less and hated by the town for the death of his parents and he has to try to survive on his own..he is then met by a retired knight (the adventurers of this new world who hunt, the demons, and carry out kill quest and other missions)who takes him him and trains him