Zero's Familiar: 3 volumes 1-3, 4-5, 6-7

In a world where sorcery reigns supreme, bumbling witch-in-training Louise Francoise le Blanc is known by her classmates at the Tristain Academy of Magic as Louise the Zero. During an important coming-of-age ritual, when each student must summon a lifelong familiar, Louise proves herself inept when she mistakenly conjures a teenage boy from Earth.