WaqWaq

Waqwaq (ワークワーク, Wākuwāku) is a manga series written and illustrated by Ryu Fujisaki. It was serialized in Shueisha's magazine Weekly Shōnen Jump from August 2004 to May 2005. The series individual chapters were collected into four tankōbon (collected volumes) and published from January to July 2005 by Shueisha. It was later licensed in Northern America by Viz Media for an English-language publication, which was released from August 2009 to May 2010. It has been re-published by Shueisha, distributed as digital media by Viz Media, and localized in other countries.

Plot
Wāqwāq is set a world where humans have black blood and fear belligerent creatures known as "machines", entrusting their salvation on the Guardians—humans who possess weapons that give them supernatural powers—, and on the red-blooded Kami. The series focuses on Shio, a Guardian who meets Matsuda, who is believed to be Kami, and starts a journey in which he faces other adversaries who wants Kami's power. Its art and story was initially said to be confusing by some critics, but others stated that these aspects get better as the manga progress.