Ajin, Okitenemuru Recommendations
Okite Nemuru and Ajin crafts horror and supernatural concepts that becomes a main core of its main story. The male protagonist gets involved in very unusual events that changes their live forever. There is also certain mystery throughout both series that defines the origins of the main premise; some with startling revelations. Anyone interested in horror fiction should give these two titles a shot.
Based on the conception about the appearence of non-humans things on earth that parasites the host, the history talks about a young host that after some circunstances disocover that he is not normal forcing him to learn literally by experience how to deal with his new life, and with whom to associate.