The story takes place in year 20XX - in the town of "East City, " where the toy "B-Daman" is popular with children. "Riki Ryugasaki" is an elementary 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.