Introduction : One day, an unknown RR virus appeared on Earth, plunging the world into disaster. Infected animals mutated into terrifying monsters and invaded in large numbers. Faced with destruction, humans built a wall and established a base city as the last bastion of mankind. The suffering that humans experienced during this period of time is called "the Great
One day, an unknown RR virus appeared on Earth, plunging the world into disaster. Infected animals mutated into terrifying monsters and invaded in large numbers. Faced with destruction, humans built a wall and established a base city as the last bastion of mankind. The suffering that humans experienced during this period of time is called "the GreatExpand