After Returning to School During the Summer Vacation, I Actually Started to Fight Monsters and Level Up?

College student Lu Yunhe was awakened by a strange voice on the high-speed train. He thought it was a hallucination, but when he arrived at school, he was forcibly pulled into a strange space. This is the planetary defense center, the brain used to direct the resistance against invaders. As he learns more and more about the new world, Lu Yunhe makes his own choice for the fate of the entire world, no, the entire universe, and is about to embark on a strange and progressive road.