During the Big Bang Grand Prix, the warrior Bun Red, Taiya Hando, witnesses the tournament being interrupted by the emergence of the enigmatic villain Universe No-One, the self-proclaimed number one monster in the universe. This entity unleashes a phenomenon called Universe Fusion, causing multiple parallel universes to overlap, putting the existence of many worlds at risk. It is in this context that the Gozyugers and the Boonboomgers find themselves embroiled in a decisive battle that could determine the fate of all realities.