Since ancient times, whether human or animal, if a certain belief reaches a certain level, it will mutate into a Nianling. The appearances of Nianling are bizarre and varied, yet their goals are surprisingly unified: to drag this world into hell. One afternoon, our male protagonist Tang Lingxiu encounters a cat-shaped Nianling on a pedestrian street, leading him to meet Zhang Ruyun, a descendant of the Zhang family, and the fire crane by her side. What stories will unfold between them in this world filled with all sorts of strange Nianling?