In the world of Zelesia where magic and swords intertwine, a "Twilight Barrier" across the continent is the last barrier to protect civilization, isolating the endless chaos monsters from the outside. The "Heart of Origin", the energy core of the barrier, is declining day by day.
Young Randall, a country boy who dreams of becoming a hero but has no magical talent, loses everything in a monster attack. While escaping, a forbidden power that was sealed in his body and had the same origin as the "Heart of Origin" - the "Devouring Power" - unexpectedly awakened. This power can both swallow magic and backfire on itself.
He was recruited into the "Watch Legion" that guarded the barrier, where he met the elf mage Elian who believed in ancient prophecies, and the wandering knight Doric who was burdened with the dragon's blood curse. The three were forced to form a team, and amid suspicion and temptation, they jointly faced numerous crises inside and outside the barrier: the approaching Chaos Demonic Tide, the power struggle within the legion, and the shocking truth about the "Devil-Eating Power" and the "Heart of Origin" buried in ancient times...
When the final dusk falls, how will Randall choose? Will he become the darkness that swallows everything, or hold on to the last light for the world?
