Zero no Tsukaima by Yamaguchi Noboru

Translated from Japanese Action Comedy Fantasy Romance Adventure School Life Military Transported to Another World Harem Magic Ecchi Loli Swords Familiars
At the Tristain Magic Academy, her classmates call bumbling witch-in-training Louise Francoise le Blanc de la Valliere “Louise the Zero.” During an important coming-of-age ritual, when each student must summon their own witch’s familiar, Louise confirms her classmates’ opinion by accidentally conjuring up a normal teenage boy from Japan. Whether the two of them like it or not, the laws of magic bind them as master and servant forever! A hilarious novel with romance interwined.

Alternative names :

1: Zero no Tsukaima