A boomer-eating monster is stalking underground Tokyo- but the AD Police have been told not to go after it. Determined to do their job, Leon and Daley decide to track the beast down anyway. Meanwhile the Knight Sabers are also on the trail of the creature, and Nene for one can't afford to mess up this battle, or she will be out of the Knight Sabers- for good.

As the Knight Sabers set about escaping from the boomer invasion of the Silky Doll, they come to realise that Galatea has used the Dragon Line to absorb the whole city, creating a boomer ecosystem. Desperately needing a respite, they head to the one place that the Dragon Line doesn't reach- a park by the sea. But they aren't the only ones to take refuge there…

With Linna and Nene adrift in space and on a collision course towards Earth, it's up to Priss to face Galatea by herself. But when Galatea sets her sights on absorbing not only the hardsuit, but also Priss herself, it seems as if the battle is already lost. Can the Knight Sabers pull through and emerge victorious from this final showdown, or has Galatea already won?