Immortality arrives as the nastiest surprise ever for high schooler Kei—and at least forty-six others. Unfortunately for Kei, such an achievement does not qualify him as a superhero. He's a rare specimen that needs to be hunted down and turned over to scientists to be experimented on for the rest of his life—a demi-human who must die a thousand deaths for the sake of humanity, in the eyes of both the general people and governments.