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Hundreds of beasts on the origin continent turned into demons, and humans built the modern Great Wall - "Border" to control demons. Humans have brought together top technologies to create high-tech weapons, including divine mechas. But the common people still live at the level of feudal society amid the struggle at the top. The monsters outside the "border" are ready to move, and the human beings in the "border" are internally divided and divided. Where will mankind go...