The Bentenmaru watches as the ship carrying the information they need is attacked by its own fleet. The princess makes the Fleet stand down, and they get the information they need. The "Golden Ghost Ship" they seek is plotting a dangerous course through nebulas and black holes, and they've got no choice but to go straight after it.
Marika Kato, a third year student at Hakuho Girls' Academy, is a legitimate space pirate with a Letter of Marque. Between her studies, leading her school's space yacht club, working part time at Cafe Lamp, and being the captain of the space pirate ship Bentenmaru, Marika's days are very busy. One day, Marika gets a job to rob a high-class passenger ship, and she discovers that on the passenger list is Kanata Mugen (played by Asami Shimoda), a boy who owns a "galaxy pass." Thus, an adventure featuring a hyperspace race between pirates and one young boy begins.