The tankōbon usually contain short gaiden, which tell the stories of other characters. Some have little relevance to the overall plot of Episode.G, with characters that play no part in the main story.
In October 2007, a new Gaiden series started being published with Episode G. This new Gaiden series is situated a few years before the main plot, and details the exploits of Saggitarius Aiolos in Egypt. A younger Aiolia and Garan also appear in this story. The story about Aiolos will appear in special volume of Episode G called "Volume 0" that is set to be released on May 20th from 2008. The "Volume 0" will also contain an encyclopedia of all the manga from Episode.G.
Gaiden Episode:
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