Magician's Academy revolves around Takuto Hasegawa, who attends a magic academy.

Magician's Academy revolves around Takuto Hasegawa, who attends a magic academy that is not marked on any map. During a summoning spell exam, he accidentally creates a girl named Tanarot, who happens to hold enough magical power to destroy his country, but fortunately Tanarot professes undying loyalty to her "creator."—Anime News Network

Takuto Hasegawa is an Ordinary High-School Student, but his high school is of a different sort. The Magician's Academy, a place dedicated to training mages and mystical creatures of all sorts. It is insane. During a summoning exam, Takuto accidentally summons an insanely powerful familiar in Tanarot, a girl with the mind of a child and enough power to destroy a country. Luckily, Tanarot is loyal to her creator/"husband".—TVTropes