A high-school student named Kei Nagai, who is caught in a traffic accident, dies, but immediately revives and learns he is not human, but an Ajin, a mysterious creature that cannot die. Scared, he runs away from humans but is helped by his friend Kai, who joins him in his flight from civilization. He then becomes involved in a conflict between human and Ajin and must choose a side.
from Manga Updates
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Notes

Alternative Names: Ajin: Demi-Human
Author: MIURA Tsuina, SAKURAI Gamon
Artist: SAKURAI Gamon
Genre: Action, Drama, Horror, Mature, Mystery, Supernatural
Demographic: Seinen
Adapted into the anime, Ajin