is a Japanese fantasy light novel series written by Noboru Yamaguchi, with illustrations by Eiji Usatsuka. Media Factory published 20 volumes between June 2004 and February 2011. The series was left unfinished due to the author's death in 2013, but was later concluded in two volumes released in February 2016 and February 2017 with a different author, making use of notes left behind by Yamaguchi. 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.

Between 2006 and 2012, the series was adapted by J.C.Staff into four anime television series and an additional original video animation episode. The first anime series was licensed by Geneon Entertainment in English, but the license expired in 2011. Sentai Filmworks has since re-licensed and re-released the first series and released the other three series in North America. A manga adaptation illustrated by Nana Mochizuki was serialized in Media Factory's manga magazine Monthly Comic Alive between June 2006 and October 2009. The manga was released by Seven Seas Entertainment in North America. Three additional spin-off manga were also created (one of them also localized by Seven Seas Entertainment), as were three visual novels.

The Familiar of Zero

Synopsis

Setting

Halkeginia

is the continent that the story of The Familiar of Zero takes place on. Halkeginia's social structure is similar to the feudal class systems of Europe in the Middle Ages, with magic-users being considered nobles. The continent itself is vaguely reminiscent in shape to western Europe, with many of the countries carrying ancient and Roman names.

The Familiar of Zero

Tristain

is the nation in which the majority of the story takes place. It is a small monarchical country located in the northwest of Halkeginia and has come under threat from Albion. Tristain is home to a highly acclaimed magical academy known as the Tristain Academy of Magic, which attracts students from nearby countries. Militarily, the country is weak, with only a small permanent force, which forces it to make marriage alliances with other countries. The capital city is . The country resembles Belgium.

The Familiar of Zero

Germania

is the largest kingdom in Halkeginia, and is also regarded as the strongest in terms of military might. It is regarded as a more barbaric and down-to-earth type of country, with its men considered to be brutish. Germania is located to the northeast of Tristain. Germania is the ancient Roman name for the region that is now Germany; the natives were at the time considered by the Romans to be barbarians. The country resembles Germany.

Gallia

is another kingdom in Halkeginia, located to the southeast of Tristania. Germania is on its eastern border, in the Alden Forest. It is the second largest country in Halkeginia. Within the Gallia Royal Family, murders and assassination attempts have led to an unstable royalty. There is a city named La Rochelle in the mountains, which is a major port. The capital city is Beautis. Gallia is reminiscent of modern-day France, which in the Roman era was called Gaul (Gallia in Latin). One of its palace/fortresses is called Alhambra Castle, named after the palace/fortress complex in Granada, Spain.

Albion

, nicknamed the white country, is an island nation which is in a period of political strife. According to the storyline, a group of nobles known as Reconquista initiated a coup d'etat against the royalty, and over the course of the story, succeed in killing the entire Albion Royal Family. Cromwell, the leader of the Albion rebellion, seeks to spread his power elsewhere, and begins by attacking Tristain. Albion is the ancient Greek name for the main island of Great Britain upon which are the modern nations England, Wales, and Scotland. The capital city of Albion is Londinium.

Cromwell is named after the leader of the Roundheads during the English Civil War, Oliver Cromwell, who successfully ousted the Monarchy, establishing a brief reign as Lord Protector until his death in 1658 prior to the return of Charles II.

Romalia

is a holy empire, located to the south of Gallia. There lies a city called Aquileia. Reminiscent of Italy, and specifically the Papal States (and the Vatican City; it is mentioned that they have a pope and officials who are bound to celibacy), which once controlled much of central and northern Italy.