The End of the World Is Coming to the Era of Alienation

In the world where the protagonist lives, a UFO suddenly descends. The virus carried by the flying object spreads across the board. When humans, animals and plants are infected, they turn into mutants that crave flesh and blood. The surviving humans are strengthened by the virus and even gain special abilities. The whole world instantly becomes a hell on earth. How does the protagonist survive the doomsday in the novel's plot?