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 Benten Maru. 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.