A young woman from the future forces a local gunman to help her stop an impending alien invasion which will wipe out the human race.
To defend their kingdom against a sudden invasion, a mighty general returns to the battlefield alongside a war orphan, now grown up, who dreams of glory.
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.
