The Familiar of Zero has been adapted into an anime series by the animation studio J.C. Staff, and it was released in 2003 with forty-nine episodes and had no fillers.
Louise is a member of the nobility who has terrible magic skills, as her attempts usually result in an explosion. She’s nicknamed “Louise The Zero” by classmates because she can never use any form or element from four different types.
Fire spells will always backfire on you; water ordinances don’t work either, not even with boiling stews! Louise ends up getting paired up for life early in school year two at Tristain Academy. They perform this special ritual where everyone summons their familiar creature, which serves them well through all eternity until death does them part.