A B-da factory where Liena, Armada and Mie are located is destroyed by the twins Ferreus and Equus. They manage to escape barely but the twins insist on making trouble for Yamato and his friends. The twins arrive to where the gang is training and defeat Gunnos and Terry easily with their advanced Cartridge system Bdamans. Yamato, Grey and Shin arrive to the scene and Yamato demands a battle. Grey and Yamato tag team to take them on. However the twins excellent cooperative play turns the tides to their favor, pushing both Cobalt Blaster and Chrome Harrier to the brink of defeat. At the end, however, Grey remembers a promise he had made to Liena and regains his composure. With one of Bull's special reloader part and both strike shots (his sister's hop shot and his speed shot), Grey begins to counter attack. Aided by Yamato's power they defeat both Ferreus and Equus in their own game.