Tayo is nervous as he goes to take the city bus license exam. He overcomes his nervousness with Nuri the taxi's moral support and passes the exam with flying colors. He follows a double-decker bus Cito to his new home, the garage. Tayo meets Speedy on the way, who lures him into a race on the riverside road. Speedy ends up having an accident and gets towed away.

Cito gives Tayo a tour of the garage. From the repair shop to the car wash to the training center, Tayo finds everything fascinating and fun. Tayo is left by himself when Cito and Rogi go off to work. Curious about the city, Tayo leaves the garage but ends up getting lost. The buses set out on a search for Tayo but to no avail.

Tayo is struggling to become a good driver. One day, a bus breaks down and Tayo is chosen as the substitute. Tayo makes mistake after mistake and becomes discouraged. He starts making rounds again with Lani's encouragement, but he's put in an awkward situation when he meets a child who is scared of buses. Tayo thinks on his feet and soothes the child by playing a song by breaking wind.

Tayo can't wait to start working. Cito notices his earnestness and suggests Rogi take Tayo along to work. However, Tayo keeps getting distracted and gets Rogi in trouble. To make things worse, Rogi breaks down and becomes immobilized. Tayo offers to help Rogi finish his rounds by hauling him. Although uneasy, Rogi decides to trust Tayo and lets him take the lead. The two help each other out.

Rogi's scary story about the Legendary Ghost Car causes Lani to have a nightmare and become scared of the dark. She mistakes Big for the legendary vehicle while passing through a dark tunnel the next day. Luckily, the misunderstanding is quickly sorted out and the two safely leave the tunnel. When Lani returns to the garage, Rogi and Tayo confess to her that the story is not real.

Cito the tour bus is hard at work as always, driving tourists around. Curious about whether the young buses are doing well, he checks up on them whenever he can. Cito spends a busy day helping the buses: Lani, who couldn't change lanes because of other cars; Big, who was stuck in a road under construction; Rogi, who was helping Big out; and Tayo, who was put in danger because of an old truck.