The story follows Ryukishi Yamamoto, a legend of the battlefield for the kingdom of Kaimino as he sets out on a journey to escort a young Rivian girl to the kingdom of Enden by trespassing through the borders of Camelot. Throughout the story, many foes try to stop him from accomplishing this mission, yet he persists for the sake of Kaimino and the other kingdoms. Will he succeed in taking this mysterious girl to Enden? Or will he succumb to the hand of the Kingsglaive, Camelot's most powerful warriors?