Five teenage mutants live at the Molodezhnaya station. Blind Tyr senses space. The militant Pard has inhuman reactions. The grass is symbiotic with mold, which gives it green skin color, healing talent and the ability to recognize edible plants. The younger Lynx “sees” radiation and has retractable claws. And only Kirill, who joined this strange company later, is simply a resident of one of the stations, who lost his family after the flood. Residents of the guys' home station, which lies almost on the surface, survived thanks to the discovery of the healing properties of one of the types of mold. The guys were caught in a collapse and remained in the metro sewers, unable to get back. Thus begins their journey through the underground world, where they become convinced that mutants are not the worst thing in the post-nuclear metro. People are much worse.