Princess Front rules the Radial Kingdom and orchestrates the global World Grand Prix race. She offers victors a stark choice: become her spouse or claim one million dollars. This prize attracts diverse contenders, including Dr. Mashirito, driven by matrimonial ambitions, and Dr. Senbei Norimaki. Norimaki enters the race piloting his Borobo vehicle, spurred by Princess Front's uncanny resemblance to Midori Yamabuki, his beloved and Arale's teacher. Princess Front herself harbors an undisclosed plan concerning Yamabuki, a scheme that directly motivates Norimaki's participation. Her narrative role revolves entirely around this race and its consequences.