In the turbulent land of Halkeginia, various kingdoms, princedoms, duchies, and lordships vie for territory, while nobles engage in schemes and intrigues to increase their influence over rulers and foreign powers. At the heart of this complex landscape lies the modest but crucial kingdom of Tristein, home to the prestigious Tristein Academy of Magic. Here, young nobles from different regions gather to learn the art of magic and develop into skilled magi. Though friendships may form across borders among students, it remains uncertain whether these bonds will survive the political maneuvering and power struggles beyond the academy's walls.
Louise Françoise Le Blanc de La Vallière, a student at Tristein Academy, is notorious for her inability to cast spells successfully. During a familiar-summoning ritual, Louise unexpectedly summons a young man named Hiraga Saito, who has been mysteriously transported from another world. After the ceremony, Saito becomes Louise's familiar.