The little buses and Hana are invited to the countryside by Nana. There they meet new friends Ractor, Champ, and Coco. Everyone is having a good time except Nana's childhood friend Coco who's upset that Nana seems to be praising Tayo all the time.
Tayo and the other buses agree to help Ractor with a few things, but when Tayo repeatedly makes mistakes, Coco jumps at the opportunity to criticize him. But Nana only comforts Tayo more, which makes Coco get angrier. Because Coco keeps telling him off, Tayo slowly gets angry himself.