The story takes place in year 20XX - in the town of “East City,” where the newest toy “B-Daman” is becoming more and more popular with children.
“Riki Ryugasaki” is a school boy in this town. He wants to be an adventurer when he grows up and his favorite word is “mystery.” Riki has a lively personality, but can be a bit of an airhead at times - he marches to the beat of his own drum. One day Riki is taken to his first B-Daman event by his friend and classmate, “Sumi Inaba.” Although he doesn’t participate as a player, Riki’s natural curiosity sparks an interest towards B-Daman. And when Riki hears an urban legend about “a secret B-Daman tournament (a tournament that only a very selected group of players are allowed to participate)” spreading amongst the children of the town, he realizes that there is something very mysterious and exciting about B-daman..
Riki is sure that the story is nonsense, but just then a mysterious, unidentifiable voice calls out to him “Boy. There are still many things in this world that you know nothing about.” Along with the voice, a boy, “Samuru Shigami” holding a White Dragon Type B-Daman appears. Riki senses something overwhelming in that cool and mysterious atmosphere. Samuru walks away and disappears. What is the mystery behind the B-Daman?