Two millennia before the series' events, humans created black-blooded androids to accomplish tasks to facilitate their lives.

Koto (コト), a red-blooded, Yoki (ヨキ), a black-blooded, and Kiku (キク), a machine, collectively known as "The Three Magi" (参賢者, San Kenja), create the Guardian Statue (護神像, Gojinzō) to gather the wishes of its wielders, the seven Guardians (防人, Sakimori), who by fusing with the Gojin-zou gain supernatural powers to fight against the machines, whose wishes are also stored into the Gojin-zou, when they are destroyed.

Along the way, Shio befriends the robot Plasty (プラ, Pura), the Guardian Leonard Hediard (レオナルド・エディアール, Reonarudo Ediāru), and the wannabe ninja Fran (フラン, Furan).

Wāqwāq, written and illustrated by Ryu Fujisaki, was originally serialized in the magazine Weekly Shōnen Jump from August 30, 2004, to May 9, 2005.

[6][7] Later, on November 18, 2008, Shueisha started to rerelease the series in a bunkoban edition, which spawned three volumes, with the last one being published on January 16, 2009.

[28] On the contrary, Active Anime's Holly Ellingwood,[2] ICv2's Steve Bennett,[29] Anime News Network's Carlo Santos,[30] and a Publishers Weekly's reviewer praised its art;[31] it was said to be imaginative,[2][31] and its character designs "full of unorthodox curves and lines ... look unlike anything else in the genre", according to Santos.

"[36] On the other hand, Kusek asserted "I don't really think Shio is that strong of a lead",[28] and Bennet criticized the non-development of the characters' relationships.

"[3] Tarbet wrote that its mithology is the most appealing characteristic of the series and praised the battle scenes involving other characters than Shio.

[25] The action was also praised by Publishers Weekly,[31] Ellingwood,[2] Maeda,[24] Santos,[30] and Zakaria, who said "They are mandala-like battles of gorgeously drawn mechs straight out of the game Zone of the Enders, and of Gurren Lagann heights of crazy.