Gunslinger Girl is a manga series written and illustrated by Yu Aida. It first premiered in Japan in the November 2002 issue of the monthly Dengeki Daioh magazine; as of November 2009, 69 chapters have been released. The chapters are also being published in collected volumes by ASCII Media Works, with the first volume released November 27, 2002. Fourteen volumes have been published in Japan as of December 11, 2011. The manga is set to end with the release of the fifteenth volume on December 17, 2012.
When ADV Manga was formed in 2003, the Gunslinger Girl manga series was one of the first titles the new branch of ADV Films licensed for an English language release in North America. The first volume was released on November 18, 2003 with the next two volumes not released until 2005. At the 2005 Anime Next convention, the ADV representative David L. Williams said the slow schedule was due to ADV Manga feeling the market was too saturated with new manga titles at the time and that they had rushed into the manga market. However, after the third volume was released that year, the series went on a two year hiatus. The series was restarted in July 2007 with the publication of the fourth volume and six volumes were released through April 2008. On April 8, 2010, manga publisher Seven Seas Entertainment announced that it has licensed Gunslinger Girl and will be re-released, with a new translation and in an omnibus format.
A thirteen-episode anime adaptation produced by Madhouse aired in Japan on Animax and Fuji Television from October 8, 2003 to February 19, 2004. A sequel created by Artland premiered in Japan on Tokyo MX TV on January 7, 2008. Titled Gunslinger Girl -Il Teatrino-, this sequel spanned thirteen episodes, concluding on March 31, 2008.