Set 225 years after a nuclear holocaust in 2015 in the modern day, the survivors are divided between those who live in comfortable underground cities and the "New Primitives" who live in the sunlight. A group of 11 of these people come across a mysterious, abandoned village. Despite the presence of numerous horribly mutilated corpses, the adventurers decide to settle in town after discovering a large amount of food, a greenhouse with various fruit trees and a reservoir of drinking water. The following night hundreds and hundreds of hungry genetically mutated rats are ready to attack them one by one.