Zero No Tsukaima, Volume 1 by Noboru Yamaguchi

Louise the Zero

In a world where magic is a common practice, Louise, a young and inept magician from the prestigious Tristain Academy, struggles with her spellcasting abilities, earning her the nickname "Louise the Zero." During a summoning ritual meant to call forth a magical familiar, she unexpectedly conjures Saito Hiraga, an ordinary Japanese teenager from Earth. As Saito grapples with his new reality, he discovers a mysterious power within himself, while Louise must come to terms with her feelings and the responsibilities of being a mage. Together, they navigate the challenges of their unlikely partnership, uncovering secrets and forging bonds that transcend their worlds.

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