A virus that is described as M-00 is a virus that turns people into blood thirsty monsters that seeks nothing more than violence and death. It usually happens when getting bitten or if any open wounds are shown for the virus to spread. To know how the virus is shown, black veins would appear in the spot that got bitten or injured, actions start to become more strange and uncontrollable, eyes become very sharp and horrifying, smiling non-stop.