Main plot:
This work tells the story of Kyle, the sharpest sword in the church, codenamed "Retribution Knight". During his mission to hunt down the "heretic" girl Arya, he accidentally discovered that she was his long-lost biological sister. This blood bond formed a fatal conflict with the demonic contract in his body that was maintained by devouring the blood of his relatives. Kyle struggled painfully on the edge of protecting his sister and self-destruction. From a cold killing tool, he gradually transformed into a "traitor" who rebelled against the church and the empire. In order to protect Arya and prevent the ancient god from coming to the world, he finally chose to sacrifice his body and seal the evil god with his life?
