In a certain city, there are unknown alien creatures called Amazons that devour humans. Their number has reached 4,000. The culprit behind this monster is Nozama Pharmaceutical Company! They order the Nozama Peston Service Extermination Team to secretly deal with the "Amazons". Under these circumstances, the young man Mizusawa Yuu, who lives a peaceful life in a clean house and never goes out, meets the man Yingshan Jin who lives like a beast and relies only on wild instincts and fighting power. They gradually learn how to survive in the fierce struggle for survival of the "Amazons".