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There were some side-story manga, but they're different interpretations of the show's storyline.
Of course there's staggering amount of world-building material that could've allowed for deeper exploration to answer about how and why it came to be a cold war between DGTO and the Protection Sphere factions over FTL technology and dualium, but given the tepid sales (too easy to blame a couple of certain similar shows), further expansion (and the remote possibility of a third season) has become more unlikely, and thus some questions are left unanswered (only to be filled out by fanfic and doujinshi authors).
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