Hana invents a machine that can shrink anything. Hana strictly tells Tayo not to touch the machine, but Tayo, who is full of curiosity, touches the machine anyway and gets hit by a mysterious ray.
The ray shrinks him into a tiny toy bus. Just then, Rookie and his niece, Jinnie, visit the garage. Jinnie, who's been carrying around a toy bus, thinks that Tayo is her toy bus and takes him home with her. Will Tayo be able to return to the garage and get back to his normal size again?