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 M (Mature, Age 18+), due to its scenes of intense violence and nudity. Source: Wikipedia (en)