Main Story
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This series is drawn by Auto Taguchi and published by Kodansha. In addition to this, according to Baka-Updates it is serialised in Magazine Z. It shares its name with another Gundam 00 manga drawn by Kouzoh Ohmari and published by Kadokawa. The two series essentially follow the plot of the anime, however they vary both in artistic style and in the sequence of events that take place. The first volume was published on 17th January 2008, and at present the series has reached four volumes. (Vol 2 - 2008/05/23; Vol 3 - 2008/08/22; Vol 4 - 2008/10/23)
Sequel
Parent Story
2307 AD. The nations of the world are split into three major power blocs, each striving to further their own prestige and prosperity. Despite the precariousness of the situation, these groups of nations insist on playing a grand zero-sum game. To stand up against the state of the world, a private organization calling themselves Celestial Being declare that they will end all war on Earth...they will be armed with the Mobile weapon Gundam. (Source: Bandai Entertainment) Minor changes are present compared to the anime, such as the use of more visually comedic facial expressions.
Side Story
A graphic novel serialized in Dengeki Hobby Magazine, featuring events before the main story. Story by Tomohiro Chiba, model conduction by Dengeki Hobby Magazine. The first Volume was released in May, 2008 by Dengeki Hobby.
Other
The story takes place in unnamed timeline, where humanity has highly advanced technology. However, the human population is decreasing and it seems that they're on their way to extinction. The protagonists are Leos Alloy, Sthesia Awar and their Haro. They work on a Jupiter base called "Jupiter X", using "General Answer" (or "GA") which contains a massive repository of data about the alternate history of Humanity, Leos travels to the Earths' of the alternate timelines in an effort to collect data that might give them a hint for the evolution of mankind. (Source: Gundam Wikia)