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 but is helped by his friend Kai, who joins him in his flee from civilization. He then becomes involved in a conflict between human and Ajin and must choose a side.

Note: Roughly mid-way through the manga, the Author Tsuina Miura left this project.

Nominated for the 7th Manga Taishou Award, the Readers Award in the 18th Tezuka Osamu Cultural Prize and in the seinen category at the 38th Kodansha Manga Awards in 2014. In the 40th(2016) Kodansha Manga Awards for general category.

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