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Louise, a young noble at Tristain Academy of Magic, struggles with her inability to cast spells successfully, earning her the nickname "Louise the Zero." During a familiar-summoning ritual, she accidentally summons Saito, an ordinary high school boy from another world, and binds him as her familiar with a kiss. Saito, now thrust into the magical continent of Halkeginia, must navigate his new role as Louise’s servant while adjusting to a world of magic and nobility. Their clashing personalities and differing values spark tension, but hints of mutual care begin to emerge. The pair’s unexpected partnership sets the stage for adventures in a realm filled with political intrigue and magical challenges.