Ajin

Once you've gotten over the animation style, which obviously takes some time getting used to, Ajin tells a really interesting story about a boy for whom everything suddenly changes from one moment to the next and he begins to doubt his humanity.

The main character goes through a phase of self-discovery.

The fight between Ajins and humans is also interesting and raises the question of what actually makes a human a human.

Ajins just want to be accepted as human beings, but the authorities, are just interested in one thing and that is to solve the mystery behind the humans who can't die, which leads to an enmity between the Ajins and humans.