一头名为博达奇（Bodacious）的凶猛公牛成为了牛仔竞技冠军。

A fearsome bull by the name of Bodacious, becomes a rodeo champion.

Marika is a high school student living on a planet known as Uminoakeboshi. One day she finds out that her deceased father was the captain of the space pirate ship called the "Bentenmaru". More importantly, the one to inherit the captain's title has to be a direct descendant—meaning that Marika is now the captain of the ship.

Marika Katou, 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, a boy who owns a "galaxy pass". Thus, an adventure featuring a hyperspace race between pirates and one young boy begins.