Zen Nagiomi is widely known mass murderer who got slapped with the death penalty. He uploaded dozens of pictures of corpses into the internet before he were caught. Those stuff was brutal enough that even by the standards of terrorist activities, this is considered a very brutal work. And according to him, he have a strong distaste for people who try to categorize other humans based on what little information they have. Since he exposed only five victims in the network, he was found guilty for murdering five people and given the death penalty, however the number of people he killed is actually twenty-one in total. All his actions were aimed at showing empathy to him and find someone who would agree with his actions. After the apocalypse, he falls under the leadership of the Kamuragi, as one of the owners of phantasm. He holds a phantasm, his power allows him to transmute phantasm energy into every poison know to man. He is capable turn this energy into a mist and spread it everywhere, even in a living object. He moves away from the main group and decides to kill innocent people who are resting in one of the buildings of the city. And by the time when enemies come to him, he already kills all the people who were in the building. Fighting against Tsunashi, he creates mist with fluoroantimonic acid, anthrax and the ebola virus, however, this does not help and he dies at the hands of Tsunashi.