I Am a Biological Weapon Without Emotions

Three years ago, a virus was accidentally leaked from a research institute in a certain country. It infected the whole world in just one year. After that, the infected people mutated into bloodthirsty, chaotic, and dehumanized monsters. Not only were these monsters super vital, but they could also spread the virus by scratching or biting humans. Two years later, there were only less than 500 million people left in the world out of more than 7 billion people. Three years later, a mysterious creature appeared. They fed on that monster and continued to kill it in the dark... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.