Global Class Change: I Conquer the World with a Civilian Class

The world is attacked by monsters, and countless humans are killed or wounded. To protect itself, the will of the planet turns the entire world into a game, giving humans the power to fight the monsters. Even then, they can only just barely hold back the onslaught, until one human appears: Ye Bufan.

The history of humanity and the monsters will be rewritten from this moment on.