In the land of Torititsu, the renowned knight Callias and his childhood companion Fiana stumble upon a mysterious young girl during their journey to ancient ruins. To protect the girl, who possesses unusual abilities, Callias and Fiana pretend to be a married couple! As the leader of the knights, the Pope, and the villagers get entangled in their charade, they embark on a heartwarming adventure, savoring a leisurely life as a 'family' filled with exploration and joy.