The city, where the civilized class live, and the slum, where the descendants of criminals "tribe folk" gather, are the two sides of society separated by high walls, and below—the Ground—a dumpsite for trash and where criminals are exiled, is feared even by the people of the slum. Orphaned boy Rudo lives in the slum with his foster parent Regto earning a living by carrying out criminal activities in the town. Though urged by Regto to stop doing dangerous activities before he gets caught, Rudo has no intentions of stopping as he is convinced it is the only way to make money and even out with Regto for raising him. However, one day he comes home only to find Regto murdered and he is ultimately accused by everyone for the gruesome crime. As he is sentenced into the abominable Pit, Rudo vows with fury to kill the person responsible and all of society who accused him of murdering his family. New truths and a fascinating world unfolds in his journey of vengeance where he meets the vibrant cast of gachiakuta.