On death row for killing his fiancée, Hirofumi Satake is also an "Undeadman," miraculously surviving numerous perilous situations. The resilience of this man has piqued the interest of "Human Crazy University," an institution that studies extraordinary real-life events and the people tied to them. Satake becomes the subject of their research and recounts his unfulfilling, everlasting existence to the scientists. Through their investigation, a vast conspiracy is slowly unveiled, ultimately revealing the motive behind his fiancée's murder.