The show is about Yamato Delgado (Daiwa in the Japanese version), who gets the legendary Cobalt Blade. He and his friends use the sport of B-Daman to fight the Shadow Alliance. This show takes place in the B-DaWorld where its inhabitants are humans, anthropomorphic animals, and robots. Using the legendary B-Daman, Yamato enters the Winners tournament organized by a group (the JBA in the Japanese version and the IBA (International B-Daman Association) in English version) to become the B-DaChampion. However, he also ends up in fights against the Shadow Alliance.

After the defeat of the Shadow Alliance, Yamato is in search of special B-Da Balls called Strike Shots, which originated from shooting stars. After a fight with the mysterious Haja and obtaining his Strike Shot, the Drive Shot, Yamato then met Gunnos, a rookie B-DaPlayer. He got his own Strike Shot to participate in the Winners Tournament along with Yamato's old friends and rivals. But little did they know…..a terrible evil is about to put the B-Da World in peril once more.