Blood Sucker: Legend of Zipangu(夜刀の神つかいYato-no-kami Tsukai) is a horror themed Japanese manga series written by Saki Okuse(奥瀬 サキOkuse Saki) and illustrated by Aki Shimizu. It is twelve volumes long and was serialized in Gentosha Comics' Comic Birz magazine, and licensed by Tokyopop in the west. The manga is rated 18+ due to its scenes of violence and nudity.