Demonic affinity

In a world where Akuma: spirit-like entities of darkness that feed on hagio that lives in every living thing. Morioka is a boy born with very low hagio making him a prime target to infect with yoki and absorb his body? After encountering an Akuma Morioka works for the other side to find special people that went missing seeing as this is his only viable option at the moment and thus becomes an Akuma himself.
Gore, strong language, Mature, and WSFW warning