Hirofumi Satake, a condemned prisoner guilty of his fiancée's murder, possesses a unique ability as an 'Undeadman' that has seen him through perilous trials. Caught in the intrigue of 'Human Crazy University,' a facility investigating extraordinary occurrences, Hirofumi recounts his immortal but sorrowful existence. As he shares his enigmatic past, the mystery behind his heinous act unravels, unveiling a web of sinister secrets and conspiracies.