The narrative focuses on Marika, a lively high school student. She occupies her time with the space yacht club and a part-time position at an upscale retro café. Suddenly, two men arrive, asserting they are subordinates of her deceased father. They insist she take command of the space pirate vessel Bentenmaru. A privateer agreement established during a war of independence a century ago dictates that the ship must pass to the captain's direct heir. Consequently, Marika begins a new existence as a space pirate.