Sixteen years after the Seven Deadly Sins brought down the Demon King, the boy Percival lives with his grandfather Varghese on an isolated rock called the God's Finger. Their quiet ends when a knight of Camelot named Ironside kills Varghese, who uses his last words to tell Percival that Ironside is his own father. Marked as one of the prophesied Four Knights of the Apocalypse, the knights said to bring the world down, Percival leaves the God's Finger to go after him.