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In this world shrouded in darkness, time seems to have stood still. Everyone is immersed in a dead atmosphere and can no longer see the prosperous and warm era in the past. The Demon King rules everything. He possesses extremely terrifying power and unshakable power, allowing everyone to survive under his control. However, at some difficult moment, the devil died. His death did not bring peace to the world, but instead plunged the world into deeper darkness. As a mysterious book says, "Every era has its own heroes, and in this era, you will become the 21 heroes who change history." This is the last wish left by the devil before his death. This last wish requires 21 people to bear it and pay the price with their lives.