Raised by cats until he was five, Yamato Delgato's only dream was to play B'Daman-the official sport of the B'DaWorld. However, his dream comes true when he's chosen to wield the most powerful B'Daman ever; the legendary Cobalt Blade. Only he has skills to harness its power. This is his journey into the world of B'Daman as he learns valuable lessons and also tries to save the B'DaWorld from the evil clutches of the Shadow Alliance.