Arale and her friends learn of a World Grand Prix being organised by the Radial Kingdom. The prize is marrying Princess Front (a dead ringer to Ms. Yamabuki) or 1 million dollars. Of course they decide to enter for the money. Not so for Dr. Mashirito; he is going for the princess and will stop at nothing to win! The princess though has her own plan, which involves Ms. Yamabuki, and that of course means even Dr. Slump decides to enter with his trusty Borobo. Let the race begin...

Kennosuke, an old-fashioned samurai kid in midcentury Tokyo, gets invited on his first-ever date by his classmate Oden. To prove he's up to the challenge, Kennosuke and his friend Shinobimaru conduct a dry run.