Ajin: Demi-Human

is a Japanese manga series written and illustrated by Gamon Sakurai. It was adapted into an anime film trilogy by Polygon Pictures between November 2015 and September 2016. An anime television series adaptation also by Polygon Pictures aired between January and April 2016, with a second season premiering on October 8, 2016. A live-action film adaptation is scheduled for release on September 30, 2017.

Plot
Those who are resistant to death are called "Demi-humans".

That day, Nagai Kei, a High school student, should have died in a traffic accident, but he comes back to life shortly after. In other words, Kei is a demi-human. Since then, Kei's world changes dramatically. Terrified and without knowing what is going on, Kei is saved by his friend, Kai. Together, they flee deep into a deserted mountain. Later, a group of demi-humans who are hostile against humans contact Kai… Who is he fighting against? Who should he side with?