The Familiar of Zero is a fantasy and comedy-oriented series of Japanese light novels written by Noboru Yamaguchi and illustrated by Eiji Usatsuka. The story features several characters from the second year class of a magic academy in a fictional magical world with the main characters being the inept mage Louise and her familiar from Earth, Saito Hiraga. The series has been adapted three times as an anime series by J.C. Staff. The first season aired in Japan between July and September 2006 and was directed by Yoshiaki Iwasaki. The second season, entitled Zero no Tsukaima: Futatsuki no Kishi, was directed by Yū Kō and aired in Japan between July and September 2007. A third anime adaptation, titled Zero no Tsukaima: Princesse no Rondo, was directed by Yū Kō and aired between July and September 2008. A fourth and final anime season titled Zero no Tsukaima F will air in January 2012. The first anime series was licensed by Geneon Entertainment in English, but the licensed expired in 2011. A manga version drawn by Nana Mochizuki was serialized in Media Factory's manga magazine Monthly Comic Alive between August 2006 and October 2009.
PLOT
The Familiar of Zero follows the adventures of the protagonists Louise and her familiar Saito. Louise is a second year student at the Tristain Academy of Magic. In this world, those who can use magic are either mages or nobles, and those who cannot use magic are known as "commoners" or "plebeians".

Louise and Saito's relationship develops during the course of the story to the point where they risk their lives to save the other. Though, Saito is usually the one to do so since Louise is almost always the one in danger. Together they face many mysteries and uncover unexpected truths, including the nature of Saito's mysterious power, and the truth behind Louise's inability to cast magic.