When the truck slammed into Kei Nagai's body, he should have died instantly. Instead, the high-school student finds himself resurrected, with all of his wounds somehow healed. However, Kei's real problems are just starting. Now revealed to be an Ajin, one of a mysterious new breed of demi-human that have begun appearing around the world, he's been marked with an international bounty, and in the eyes of the world's governments, Kei is a specimen to be contained by any means possible.