Yasutaka Tsutsui
The novel was adapted in 2004 into a two-volume manga called , illustrated by Gaku Tsugano, and story by Yasutaka Tsutsui . The manga was released in English on October 2008 by CMX Manga. A manga adaptation of the 2006 anime film was serialized in Kadokawa Shoten's "Shōnen Ace" manga magazine between April 26 and June 26, 2006, illustrated by Ranmaru Kotone; the chapters were later collected into a single bound volume which went on sale on July 26, 2006. Another manga, known as , set as prelude to the 2010 film was serialized in "Young Ace" magazine.