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Demonic spirits establish demonic contracts with people through demonic contractors. People can obtain the spiritual abilities of demonic spirits, but must complete a task of the demonic spirits. However, behind the demonic contract is the revenge conspiracy of the demons and the complex struggles between humans, monsters, gods, demons, and various races. Five teenagers from the slums took different paths in life because of an ordeal, and they were all involved in this war that overturned the world!