The world-ending disaster of the millennium brought mankind almost to the bottom of the class.
Fragile and small, but still dreaming of conquering the world, this is human beings, humble human beings.
They are the food of vampires, the slaves of demons, and ants in the eyes of angels. They are the weakest existence among the four major races, so in order to survive, they need to do whatever it takes because they are weak.
Fight and conquer in the name of a weakling, and then climb to the top of the world as a weakling.