On the run from his troubled past, Juuzou is forced into competing in a deadly underground fighting tournament. Skilled in the respected martial art Takemiya-ryuu, Juuzou must navigate a path filled with formidable foes and his personal demons — all while dealing with a bounty of three million yen on his head and a detective on his trail.

Two siblings were happy on Mt. Olympus, until they fell in love. Deimo's sister Venus got imprisoned in the Swamp of Death. To save Venus's life, he must find a human reincarnation so that they can continue their love.

A.D. 2040—Thirty years have passed since the battle between the Earth and Zentraedi forces changed the lives of both races. On planet Eden, a top-secret project known as "Supernova" is being held to determine U.N. Spacy's next-generation variable fighter. Competing to win the funding are Shinsei Industries' YF-19 and General Galaxy's YF-21. Piloting the YF-21 is Guld Goa Bowman, a half-human, half-Zentraedi. Shinsei receives its new test pilot in the form of the unruly fighter pilot Isamu Dyson, who was once a friend of Guld. Meanwhile, as Isamu and Guld furiously battle to see which of their fighters is superior, a Virturoid Idol named Sharon Apple is to perform her debut concert on Eden. In charge of Sharon is producer Myung Fang Lone, another former friend of Isamu and Guld. When the three meet each other, old disputes spark from a troubled past. Little do they know that their past incidents—along with the Supernova Project and Sharon Apple—will somehow bring them together.

On her first day of junior high school, Mato Kuroi meets Yomi Takanashi. Though Yomi is initially taken aback by Mako's straightforward personality, the pair quickly becomes friends and begin to spend time together daily. As a sign of their friendship, Mato gives Yomi a cell phone charm—a blue star, identical to her own. However, when the two enter their second year, their relationship starts to change. Placed in a different class, Mato begins to spend more time with Yuu Koutari instead, a girl she met through the basketball team. In fact, the former best friends drift apart so much so that Mato cannot find Yomi anywhere, as if she had disappeared entirely. Elsewhere, Black★Rock Shooter is on a quest to vanquish the Dead Master. These two, while opposed, bear a connection not unlike Mato and Yomi. As their stories begin to cross, it seems Yomi's disappearance may have to do with the blue star-shaped charm and the legendary gunslinger herself.