Based on Tani Kosyu's novel and novellette series,"Koukuu-utyuugun-si (history of space army ?)", this game covers the most important episode in the novel.
Outer planets has made a revolt against the Earth. But, it could not be successful according to the novel.
This game simulates this revolt with "War at Sea" system.

1 map (separated into 4 pieces)
2 countersheets
1 rulebook (12 pages)

The website (Japanese) is
http://solger.sblo.jp/article/1087769.html