The people of the B-Daworld have been using B-DAMAN marble-shooters in sport since ancient times. Yamato is a headstrong boy who has been given Cobalt Blade, the most powerful B-Daman. Yamato must use Cobalt Blade to fend off the members of the evil Shadow Alliance in his quest to become the B-Daman champion.

Ce synopsis est en anglais : nous ne l'avons pas encore traduit.