A fantasy light novel series written by late Yamaguchi Noboru with illustrations by Usatsuka Eiji, with a 2006-2009 manga adaptation and a four-season anime adaptation by J.C. Staff. The 22nd and final volume, based on a plot by the late author, was released in February 2017.
During a familiar summoning class at the prestigious Tristain Academy of Magic, Louise Françoise le Blanc de la Vallière, a 13-year-old second-year notorious for her temper as short as her stature and horrible track record at spellcasting (earning her the nickname "Louise the Zero"), manages to summon Hiraga Saito, a human boy from Japan. While initially reluctant to rely on (and often disdainful of) him, Louise has come to accept Saito's role as her familiar, and soon develops romantic feelings for him, even as they help defend Tristain from enemies within and outside.
