Sixteen years after the fall of the Demon King, the Supreme Divinity and the dispersal of the Seven Deadly Sins, the story focuses on Perceval, a pure-hearted boy who lives with his grandfather in a modest, secluded home.
However, their destiny unexpectedly changes with the arrival of an enigmatic knight who inflicts severe injuries on Perceval and murders his grandfather. This knight, in the service of King Arthur, is on a quest to find the "Four Knights of the Apocalypse", who, according to prophecy, represent a threat to the world.
Now alone, Perceval embarks on a long journey in search of his father, without the slightest idea of what lies ahead...