A platonic friendship develops between Renna and Maia. Their group, which includes Naroin, is later overtaken at sea by pirates (pirating being a tolerated, legal activity). During the ensuing boarding fight, Maia is shocked when she encounters her sister, one of the pirates. The pirates win, with the help of traitors planted in the rads' group. They strand many of their female prisoners, including Maia and Naroin, and one young male sailor named Brod on a deserted island and take Renna, their prize, to a secret base.