Dengeki Comics
The manga is written and illustrated by Ryoichi Koga. It was serialized in MediaWorks' "shōnen" manga magazine "Dengeki Daioh" between the August 2000 and March 2006 issues. The chapters were collected into four "tankōbon" volumes under the Dengeki Comics EX imprint between February 2002 and May 2006. The manga is released in English in North America under the title "Ninin Ga Shinobuden" by Infinity Studios, who released the volumes between May 2006 and April 2008. A sequel manga titled "Ninin ga Shinobuden Plus" began serialization on Kadokawa Corporation's "Comic Newtype" website on June 26, 2020.