After the invention of B-Daman machines that propel marbles, individuals began competing in the thrilling sport of B-DaBattles. However, these machines possess covert abilities that can be exploited for hostile intents. In a restaurant, a mysterious entity concealed within the walls summons Yamato Daiwa, a feline-raised boy who has been haunted by visions of a contraption resembling a known machine. Unbeknownst to Yamato, the enigmatic object is not merely a machine but holds the destiny of the entire world.