Ajin is really just a adaptation of a Japanese manga series illustrated and written by Gamon Sakurai. Kei Nagai expires in an auto collision, but nevertheless he could be a form of immortal referred to as Ajin (demi-human). Hunted by humans, Ajin is found by the government and used to be an interest in cruel experiments. Fellow demi-humans are found by him on the way as he escapes and goes on the series.