As a high school student, Marika Katou faces unique challenges as the captain of a space pirate vessel. Unable to resort to the usual tactics of her trade, Marika must rely on her ingenuity and leadership skills to command the Bentenmaru. She eschews plundering and raiding in favor of staging fake boardings of space cruise ships while prioritizing the safety of all involved. However, when Marika sets her sights on robbing the luxury liner Begin The Beguine, things take a dark turn. An unsuspected passenger with hidden motives is kidnapped, making the Bentenmaru the target of competing warships, all eager to claim the ultimate reward.