Tamiya makes an announcement to the Nekomi Tech Motor Club that they will be entering a race which uses Honda Supercub bikes. Furthermore, Tamiya decrees that Belldandy will be the team girl. To Keiichi's dismay, Tamiya has bet with Etsushi Ohtaki that should they lose, Belldandy will be Etsushi's team girl. Etsushi comes by the NTMC's house to check out Belldandy and to gloat. Belldandy is annoyed as she readily agrees to the bet. She then orders Etsushi out by mixing a spell with her speech. Keiichi is concerned and promises not to let Etsushi near her. Belldandy isn't concerned and shows her appreciation of Keiichi's remarks by embracing him and falling asleep in his arms.

The day of the race, the club members draw marbles to see which race they will participate in. Keiichi draws the marble which places him into the Ultimate Class - a class where you can use a custom-built bike providing a major part in the bike is a Supercub part. Otaki has built a bike with only the brakes and front rim being a Supercub part. This has Keiichi freaking out that he won't have enough braking power.

Meanwhile, Belldandy becomes aware of an unlucky star working against Keiichi. As Keiichi's race begins, Otaki and Tamiya discuss the bikes build and the corners taken to make the bike lighter. The unlucky star begins to work forcing Belldandy to cast a spell which causes the unlucky star to be eclipsed by a lucky star. Keiichi wins the race just as the unlucky star reappears causing the bike he is riding to begin to fall apart. He uses the drag chute only to discover it is a useless, tiny parachute. Tamiya and Otaki think this is very funny and Keiichi survives the bikes destruction. Belldandy rewards the race winner with a happy embrace.