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On the earth at the other end of the parallel universe, there is a country on the edge of a "cliff". There is a group of contract troops on the border of this country. They are originally human beings. By chance, they signed a contract with the demons. The demons gave them inhuman abilities, and they dominated the world for the demons. The contract army won successive battles, and the country was in danger. A scientist developed a powerful weapon that cannot be used by ordinary people. At this time, the fate of this country is in the hands of one person...