Global Catastrophe, I Can Upgrade Infinitely

One day, Blue Star suffered the largest meteorite crisis in history. The falling meteorite carried the unknown HRD virus, which plunged the entire world into disaster. The infected animals mutated into terrible beasts. These beasts were so numerous that they finally forced mankind to face destruction. They built strong walls and established a base city as a fortress for mankind. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.