Masked Saber and Super Beagle fight valiantly against the Jerk Empire. However, during battle, Beagle accidentally hinders Saber, causing Saber to suffer severe injuries. Blaming herself, Beagle is left with no time to grieve as the Jerk Army launches another attack. With Saber undergoing surgery, Beagle heads into combat alone. But this is a trap set by Dr. Darkness—to capture the outmatched Beagle and eliminate Saber at the same time. Unexpectedly, an old man who was chasing Beagle takes her place, leaving Beagle to become a new test subject forced to fight in a special combat ring.