After the great war 300 years ago with evil forces, humans were defeated. People say that this is the "Curse given by the gods". Humans are forced to build an entire wall to protect themselves. The union of each country has been banished, leading them to become independent and fight the evil forces on their own due to humans never stepping their foot out of the walls. However, years later evil forces slaughter humanity. That leads them to become a survivor of "The Fall of Sector 10."
