When Koguma lets it slip in class that she owns a motorbike, she attracts the attention of Reiko, one of the girls who sits near her. Reiko insists on seeing Koguma's Cub, as well as showing off her own, and is pleased to meet a fellow Cub rider.

With the arrival of autumn, Koguma and Reiko's attention turns to getting ready for winter. When the class culture festival committee runs into a snag getting what they need for their activity, the pair volunteer to use their Cubs to come to the rescue.