In a city swarming with life, an agony unravels as the primordial demon "Legion" escapes its ancient prison, wreaking havoc and claiming countless lives in a brutal rampage. Amidst the chaos and despair, one man steps forward: Caen Rouge, an ordained priest with unshakable faith and powers bestowed to him from hell. As the city's last hope, Caen confronts the demon in a battle that transcends mere survival. This epic struggle between the flames of hell and the darkness of old, flames and malevolence, unfolds in the heart of the city, where the outcome will decide the fate of thousands. In this high-stakes brawl, Caen's courage and resolve are pushed to their absolute limits as he goes toe to toe with a demon from the old days.