Ajin: Demi-Human

A model high school student with plans to become a doctor, Kei Nagai's life shatters the day he gets hit by a truck and wakes up. Turns out he's an Ajin — one of the rare immortal humans the government has been quietly rounding up and detaining since they first appeared in Africa 17 years ago. Within minutes of dying and coming back in broad daylight, Kei goes from model student to the most wanted person in Japan. His childhood friend Kaito helps him flee, but the deeper Kei runs, the more he discovers about what the government actually does to captured Ajin, and about a dangerous Ajin named Satō who has very different ideas about how their kind should respond. This 13-episode TV series leans hard into its seinen roots — the moral lines blur fast, and Kei isn't your typical sympathetic protagonist. He's calculating, pragmatic, and not always easy to root for, which makes the whole thing more interesting. The 3D CGI animation from Polygon Pictures takes some adjusting to, but it works well for the action sequences and the eerie "black ghost" power system. The soundtrack is genuinely unsettling in the best way. If you liked Tokyo Ghoul's premise of someone becoming the thing society fears, or the body-horror tension of Parasyte, this covers similar ground with a more strategic, cat-and-mouse approach. Fans of Gantz will also find familiar darkness here. It's bleak, tense, and doesn't hold your hand.