To ensure Arthur Pendragon becomes the next king of Terage, Sophie Clemont, and Lonan, a child of Satan, must adventure through a world filled with deception, dead-ends, and uncertainty at every turn.

Arc 1: The Time-Traveling Serial Killer
Sophie Clemont, after having finally gained control of her magic abilities, is sent on a mission to investigate the mysterious killing of several noble families. She is soon joined by Lonan, her supposed guard, as the two work behind the scenes to ensure the future of Terage is entrusted to Arthur Pendragon.