Robot is an all-color manga compilation compiled and edited by the elite manga artist Range Murata, character designer for Studio Gonzo's Last Exile and Blue Submarine No. 6. Murata's hand-picked contributors come together in a mind blowing experiment of what happens when top manga artists work in the unusual medium of color. Robot was partially published in English, the first three volumes by Digital Manga Publishing from September 19, 2005 to December 1, 2006, after which the license was taken over by Udon Entertainment, who published volumes 4 and 5 from December 1, 2007 to May 1, 2008, before they too dropped the license. It has been published in its entirety in French by Glénat.

It's 217 AD, several decades after the end of the "Pax Romana," and the Roman Empire is still the most powerful empire in the world. However, between corruption in the government, increasing attacks from savage hordes, and continuing resource-draining foreign campaigns, the power of Rome is on the decline. With the recent assassination of the emperor Caracalla, many things are about to change…