Eager to B-DaBattle other B-DaPlayers, Yamato learns of the B-Coliseum, a place where all B-DaPlayers can play all sorts of B-Daman games. When he gets there he soon realizes that he still has a lot to learn about the sport. But when a mysterious member of the Shadow Alliance shows up, it's up to Yamato to put his skills to the test and stop the evil Battle Crow from destroying the B-Coliseum.