It appeared like Ganta Igarashi and his classmates were about to go on a class field trip to Deadman Wonderland, a prison entertainment park where inmates do perilous actions for the delight of bystanders. Ganta's existence, however, is abruptly flipped upside down when his entire class is killed by a strange guy in red. Ganta is taken to the exact jail he was scheduled to attend after being framed for the event and sentenced to death. But Ganta's misery is only getting started. The young protagonist is thrust into a world of sadistic convicts and unfathomable abilities, where he must live in continuous terror of the fatal collar placed around his neck, which can only be slowed by victory in the game.