A man on death row has to explain why he killed the one person he loved, and the answer isn't what you think it is. The show builds this mystery backwards through his memories, each one peeling away another layer of what "immortal" actually costs you when everyone around you stays mortal. By the end, you're not asking whether he did it anymore, you're asking whether surviving everything is worth the same thing as living.
Satake Hirofumi sits on death row for a murder he committed, but his captors have bigger plans than execution. He's an Undeadman, someone who refuses to die no matter what happens to him, and that makes him invaluable to the Human Crazy University, a shadowy research facility obsessed with studying inexplicable human phenomena. In exchange for his cooperation, Satake recounts his past: a lifetime of impossible survival, a fiancée he killed, and the reasons why. Each memory he shares pulls back another layer, revealing his death row confession wasn't the whole story. There's something darker beneath the surface, a conspiracy that extends far beyond one prisoner's crimes. The institution's researchers press him harder with each session, drawn deeper into a mystery where immortality becomes a curse and truth becomes a weapon. Satake's past and present collide in a psychological thriller that questions what it means to survive when death itself won't claim you.