Yamato Delgado dreams of playing B-Daman and his dream came true when Gray Michael Vincent interrupts Yamato's birthday by challenging him. Then, an incomplete Cobalt Blade comes out of the wall and then Yamato battles Gray. After the event, Yamato sets out to find all the parts of Cobalt Blade while battling other B-DaPlayers all over. Yamato then gets trained by Armada then competes in the Winner's Tournament to battle all other strong B-DaPlayers. (bdaman.fandom.com)