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：The city, where the civilized classes live, is separated by towering walls—a slum where generations of criminals congregate, subjected to daily humiliation and contempt, called scum, a hideous "ethnic group." These two sides of society are divided by these walls, and beneath—the Abyss—is a garbage dump where criminals are exiled. Even the slum dwellers, accustomed to squalor, fear this place. An orphan boy, Rudo, lives in the slum with his foster father, Regto, surviving by engaging in criminal activities. Despite Regto's pleas, Rudo refuses to stop, believing it's his only way to earn money and support Regto for raising him. But one day, upon returning home, the familiar sights were replaced by a scene he could not believe. Regto had been murdered, and he had been accused of the murder. Sent to the Abyss—that hideous hell—Rudo screamed, vowing with all the anger and despair within him that he would surely kill the murderer and destroy all those who had accused him of killing his family.
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