When he woke up, he was chained to the wall by a poisoned collar... Yes, this is a Death Game hosted by a demon. A murder Game where one should use their bestowed supernatural powers and strategies to kill other participants and grant their own wishes... Or so it was supposed to be, but a "Muscle-brained" idiot, Gou Kabashima, who rips off the fastened collar and smashes through the closed iron door, has wandered in, causing the Game to completely collapse!?