In a land ravaged by economic collapse, young Kazuya endures the brutal conditions of an orphanage, his mysterious violet eyes setting him apart. Everything changes the night he discovers a pendant that bestows upon him demonic powers, transforming him into a force of darkness.

With his newfound power, Kazuya sets down a path of vengeance against the corrupt nobility. Determined to claim the Wartford Kingdom for his own and right the wrongs inflicted upon the poor, Kazuya partners with Anya, a fellow orphan and his loyal servant.

Their journey takes an unexpected turn when they encounter Arthur, a mysterious and powerful figure with his own hidden motives. Arthur’s vast knowledge of magic and formidable skills quickly make him a threat to Kazuya's plan.

As they travel through desolate villages and grand mansions, Kazuya and Anya must harness their newfound abilities to survive, with each step bringing them closer to their ultimate goal: to topple the oppressive regime and create a world in Kazuya's image, a world where his self-proclaimed justice prevails.