Katanagatari is a Japanese light novel series written by Nisio Isin and illustrated by Take. The series is published by Kodansha under the Kodansha Box imprint. The story revolves around a katanagari, or "sword hunt" for 12 weapons that were created by a single swordsmith. An anime adaptation by White Fox began airing on January 26, 2010, and consisted of 12 episodes. A single episode of the series was aired each month. NIS America have licensed the series and released the first part on a Blu-ray/DVD combo set in July 2011. Part two was released on September 20, 2011. The anime series aired once more on Fuji TV's noitamina between April and November 2013 as the block's first rerun, with a new opening and a new ending song.

A light novel is a type of popular literature novel native to Japan, usually classified as young adult fiction targeting teens to twenties. The definition is very vague, and wide-ranging.