Toshokan Sensō(図書館戦争, lit. Library War) is a Japanese light novel series by Hiro Arikawa, with illustrations by Sukumo Adabana. There are four novels in the series, though only the first novel is called Toshokan Sensō; the subsequent novels are named Toshokan Nairan, Toshokan Kiki, and Toshokan Kakumei. The novels were published by MediaWorks between February 2006 and November 2007. Two volumes of a spin-off series entitled Bessatsu Toshokan Sensō(別冊 図書館戦争, lit. Supplement: Library War) have also been published by ASCII Media Works. As of April 2008, the original four novels and volume one of the spin-off series have sold over 1.25 million copies in Japan. The story was inspired from the Statement on Intellectual Freedom in Libraries of the Japan Library Association.