Volume 12: Mouretsu Shuusen Kousaku
Following the clues left behind in the time capsule as to the missing Bentenmaru's whereabouts, Marika and the yacht club have followed the trail in the Odette II back to the space-time anomaly, and have gone back in time to the War of Independence.
However, though they may have found the Bentenmaru, another serious problem has arisen - events appear to be differing from those of recorded history, and the Galactic Empire shows no signs of intervening in the war, even though it is less than a week before the war is supposed to end.
Facing the prospect of a changed timeline and the war not ending on time, Marika and her crew have to consider taking drastic action in order to get back home. With six days left, they have to act fast...