In the present epoch, the darkened inhabitants are overrun with malevolent demons and fearsome monsters who prowl through the streets at night. To thwart these lethal entities, humanity has allied with their familiar counterparts as companions to exterminate them. However, Fan Xiaotie, a conscientious public servant, and Linyu, the most formidable demoness from the clandestine division called the "Supernatural Affairs Armed Response Team," confront an unyielding predicament.