Kei Nagai dies in a car accident, but realises he is a type of immortal known as Ajin. Hunted by humans, Ajin is eventually found by the government and used as a subject in cruel experiments. He finds fellow demi-humans along the way as he escapes and goes on the run.

Tamotsu is suspected of murdering his actress wife Shizuka Harada. He flees to Taiwan and commits suicide. Tamotsu’s friend Banji Masuzawa works as a private detective, and has doubts about Tamotsu’s death, but the case is covered up by powerful media mogul Heizo Harada.

A Himalayan legend of a love struggling against the inevitability of death, an astonishing tale spanning from the early 19th century mountain existence, to hectic, bustling modern day Tokyo.