16 years after the defeat of the Demon King, the Supreme Deity and the disbandment of the Seven Deadly Sins, the story follows Perceval, a kind boy by nature, who lives with his grandfather in a small isolated house. However, their fate changes abruptly when a mysterious knight arrives who seriously injures Perceval and kills his grandfather. This knight in the service of King Arthur is looking for the “Four Knights of the Apocalypse” who, according to a prophecy, are a threat to the world. Now alone, Perceval then undertakes a great journey in search of his father, without suspecting what awaits him...