Summoned to purify the corruption spreading across Arad...? Jinseong, a player who dedicated his life to "Dungeon & Fighter," is summoned to Arad by the transcendent Nemer and given the mission of becoming the Claw Master. “You shall become the Claw Master and guide the blade through rightful trials.” "I'll become the Claw Master or whatever it takes. I will survive in this Arad!" Will DFO veteran Jinseong successfully complete his mission and return to the real world? The story of the Dark Knight Jinseong's quest to prevent the destruction of Arad begins!