Shiro Bom and Ao Bom serve in the B-da cops, the force that keeps the peace across the B-da Union. One day they spot a spaceship fleeing space pirates, and the ship comes down hard in the wilderness. At the crash site they find Princess Aka Bom, whose kingdom has come under attack, lying next to a glowing gem with mysterious power known as the Crysmond. The enemy wants that gem. Teaming up with Kiiro Bom and Kuro Bom, the B-daman set out to keep the Crysmond out of the hands of the Devil Veders. A 50-episode science fiction sequel to B.B-Daman Bakugaiden, based on the Hudson Soft game.