In the near future world, human society has developed to a stage where it is highly dependent on biotechnology, but a sudden "spore rain" completely changed the earth's ecology. It is not a traditional zombie virus, but a symbiotic fungus that can recombine biological DNA. The infected person will not die but will form a new symbiotic relationship with the fungus. Three months after the collapse of civilization, 90% of the population was transformed, and the remaining humans struggled to survive in a new ecosystem dominated by fungi. They had to fight not only mutant organisms, but also "symbionts" transformed by fungi.
