Synopsis
One day, an unknown RR virus appeared on earth, and the world fell into disaster. Infected animals mutate into frightening and massively attacking monsters. When humans face destruction, they build walls and build base cities as the last bastion of man. The trials experienced by mankind during this period of time are called the "Period of Nirvana." In extreme living environments, human power is also gradually advancing and evolving, and martial arts are emerging, and human power is qualitatively...
