On the first day of junior high school, Mato Kuroi happens to run into Yomi Takanashi, a shy, withdrawn girl whom she immediately takes an interest in. Mato tries her best to make conversation with Yomi, wanting to befriend her. At first, she is avoided, but the ice breaks when Yomi happens to notice a decorative blue bird attached to Mato's phone, which is from the book Li'l Birds At Play. Discovering they have a common interest, the two form a strong friendship. In an alternate universe, the young girls exist as parallel beings, Mato as Black★Rock Shooter, and Yomi as Dead Master. Somehow, what happens in one world seems to have an effect on the other, and unaware of this fact, the girls unknowingly become entangled by the threads of fate.

In the year Future Century 0060, the many countries that once comprised Earth's surface exist as separate colonies floating in space. Their home planet now uninhabitable, the ruler of all of the colonies is decided by their unanimous participation in the intergalactic Gundam Fight Tournament—a series of battles between the champions of each colony to determine who is most fit to reign over them all. Neo-Japan's champion is Domon Kasshu, a man who accepts the role with some ulterior motives. Domon searches the galaxy for his brother, a criminal who allegedly murdered their mother and made off with the Devil Gundam, a highly advanced weapon with the power to unleash mass destruction across the galaxy. In his quest to bring his sibling to justice, Domon travels from colony to colony, meeting many of the fighters who will become his allies and enemies in the forthcoming Gundam Fight Tournament. Armed with the strength of the Shining Gundam, Domon battles to uncover the truth behind his tortured childhood, suffering great betrayal and crushing blows on his quest toward personal and national triumph.

Yuusei Fudou is out to get back what was stolen from him. The world of dueling has evolved, with Riding Duels becoming the peak of entertainment for the residents of Neo Domino City. They are played on D-Wheels, a hybrid between Duel Disks and motorbikes. After the mechanically skilled Yuusei managed to build his own D-Wheel, his former friend Jack Atlas stole it alongside Yuusei's best card, Stardust Dragon; ditching their decrepit hometown of Satellite, he escaped to Neo Domino City. In the two years since then, Jack has risen to the top of the dueling world, while Yuusei has been making preparations thanks to the help of his friends. With his new D-Wheel finished, he now sets off to Neo Domino City, his only goal to find Jack. Unbeknownst to either of them, there are far bigger things at stake than they can imagine, with puppeteers pulling the strings behind the scenes.

Ryo Saeba is a private detective, but has another face as a sweeper who cleans the city of evil. He is able enough, but has a bad habit of getting over-excited about beautiful women. It is his partner Kaori Makimura's job to protect those beautiful female clients from Ryo's sexual harassment. (Source: Sunrise)