The story follows 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 hunting him down 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.

Note: Only the first volume is credited to MIURA Tsuina; all subsequent volumes were written and illustrated by Sakurai Gamon.

Nominated for: (1) 7th annual Manga Taishou Award, (2) Readers Award in the 18th Tezuka Osamu Cultural Prize, (3) 38th Annual Kodansha Manga Awards (2014) in the Seinen category, (4) 40th Kodansha Manga Awards (2016) in the General category.