A light novel based on the series, written by Toshihiko Tsukiji and illustrated by Kenjiro Hata, was released on May 24, 2007, published by Shogakukan under their GAGAGA Bunko label. The novel includes a doppelgänger and barrier that Maria encounters, Isumi Saginomiya's magic that happens in front of Nagi's eyes, and the corruption of the building of the Film Analysing Club (You Tobe) that Izumi Segawa, Miki Hanabishi, and Risa Asakaze were members of.
A second light novel entitled Nagi is the Familiar!? Let it ★ World Conquest(|ナギが使い魔!?やっとけ★世界征服|Nagi ga Tsukaima!? Yattoke Sekai Seifuku) was released on March 18, 2008. The title is the combination of Zero no Tsukaima" and the phrase which is similar to Lucky Stars first opening theme, "Take It! Sailor Uniform"(もってけ!セーラーふく|Motteke! Sērāfuku). The cover of this novel features Nagi wearing Louise's costume. Insert images are drawn by Kenjiro Hata and Eiji Usatsuka, the illustrator of Zero no Tsukaima light novels.