Marika Katou is hit with a major revelation: her father served as captain of a pirate vessel. This news comes in as the second biggest shock of her life, as the first is learning that she needs to perpetuate her father's legacy and take over his post according to the Privateer's contract. Luckily, her enrollment in the school's yacht club proves to be beneficial, enabling her to share this exciting journey with companions her own age. As if space piracy wasn't thrilling enough, Marika and her crew encounter challengers from outer space and come to the rescue of endangered royalty while balancing their responsibilities as high school educators. The upcoming journey aboard the Benten Maru guarantees a crazy ride!