Six millennia ago, on the Sacred Demon Continent, humanity thrived and brilliance was abundant. The three major empires and the illustrious Church were the sole forces maintaining a balance of power. Yet, amidst this era of prosperity, plots and ambitions began to silently flourish, slowly corroding the entire realm. Driven by the empire's interests and the Church's schemes, the son of light, Alex, broke away from the faith of light, turning into the undead plague, and unleashed a catastrophic retribution upon the world and humankind using his own might.