Tamago Tosaka is a fifth-grader who loves nothing more than a B-Daman battle. One day, Ganma Nishibe, a talented bead-warrior, is transferred to Tamago's school. Their B-Daman battles set the stage for this story. Beginning as rivals, the two come together to prepare for the B-Daman championships. The two boys come to trust and help one another as they work toward their shared goal.