Weary of eternal life, the Demon King Azrael seals away his power and descends into the mortal world — only to be swept into the Abaddon Tree, a secret prison run by a mysterious research institution. To keep his cover, he becomes a Class-D test subject: a living punching bag whose resilience is recorded by researchers, pitted against mutated experiment bodies in the arena to measure their destructive force. There he meets Elias Rothschild, a noble-born young man framed for a crime he didn't commit. After his father's murder, Elias was thrown into death row by the usurpers who stole his family's name. Unable to pay the protection money demanded by the prison gang "the Iron Curtain Brotherhood," he suffers humiliation and abuse every single day. Moved by a pity no demon should ever feel, Azrael silently steps between Elias and every blow. Elias fears him at first — then slowly falls for this quiet, unyielding man. In the darkness, they cling to each other, bound by a love that transcends life and death. To keep Elias from being chosen as the next subject for experimentation, Azrael volunteers for the most dangerous strength tests, fighting berserk high-level experiment bodies to the death. Head researcher Eve records the brutal data on the surface, but secretly mends his wounds with her medical skills. During a routine test against the super-class experiment "Killer X-7," the subject suddenly goes berserk, smashes through its safety cage, and lunges straight at Elias in the observation area. Before everyone's eyes, Azrael — in human form — absorbs a full-force strike and tears the beast apart with his bare hands. A power far beyond any Class-D's limit instantly catches the eye of Raphael, the prison's highest authority. And a far greater conspiracy is quietly unfolding...
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