You get hit by a bus in the first ten minutes and survive it, and the show immediately stops caring about how. What it cares about is the weight of what comes next: a government that will dissect you, fellow immortals who want to use you, and the person you were before dying the moment anyone finds out what you are. The Black Ghost, that thing you can summon but barely control, becomes the only part of you that feels alive while everything else is hunted. Kei's powerlessness despite being unkillable is the real horror here. This is survival stripped of heroism: just a kid learning how much cruelty he's willing to become in order to stay breathing.

A bus hits high schooler Kei, and he should be dead, but he survives. He is an Ajin, one of a small number of people, at least forty-six, who cannot die. That makes him no hero. The public and governments see him as a rare specimen to capture and hand to scientists for endless experiments. On the run from the government and from other Ajin, the once indifferent Kei must learn to use his new powers, aided by his Black Ghost, if he hopes to avoid becoming a test subject. The film blends action, horror and mystery with a supernatural premise.