Fiends

Shortly after finding himself in the Netherworld, merging with the Proto-Fiend Aogami, and becoming a Nahobino, Naobi Hino meets a creature known as the Demi-Fiend, Agreeing to combine forces while in the Netherworld, the Demi-Fiend and Naobi soon find themselves getting roped into working with the angels of Bethel, and the situation only escalates from there.