Ajin Part 3: Shougeki  

Ajin: Demi-Human Movie 3: Collide, 亜人 第3部「衝戟」

Kei, a high school student, discovers that he has become immortal. However, this does not make him a superhero in the eyes of the general public and governments. Instead, they view him as an unusual specimen who must be captured and subjected to scientific experiments for the benefit of humanity. Despite his newfound ability to live forever, Kei faces the harsh reality that he will have to die many times over for the sake of others.