Y/N moves to South Park expecting a quiet new start, only to discover a town trapped in endless chaos, stupidity and disaster. Every day brings another ridiculous crisis, another selfish decision and another example of nobody learning from anything that happens. At first, Y/N simply watches. Then they start keeping track. Names become a list. Annoyance becomes obsession. Eventually, Y/N decides that South Park cannot be fixed, only erased. One by one, people across town begin to die under increasingly bizarre circumstances. At first, nobody connects the deaths. The police are useless, the adults blame completely unrelated causes, and Cartman immediately tries to use the situation to his own advantage. Stan and Kyle eventually realise that Y/N is behind everything and that nearly everyone in town is marked for death. But the biggest problem is Kenny. No matter how many times Y/N kills him, Kenny keeps coming back. Worse, Kenny remembers. As South Park's population falls and Y/N gets closer to completing the list, Stan, Kyle, Cartman and Kenny are forced to work together to survive, uncover why Y/N snapped, and somehow stop someone who has decided the entire town deserves to disappear. For Y/N, there is only one goal left: Population: Zero.