Tooth Birthday - Dinobabies Animation

When Taami goes to the city for a few hours, Aami and Taami must find it difficult to spend the time on their own, for they are always together from dusk until dawn. Aami waits for Taami and the latter rushes for her, the duo must find ways to spend the time. Why did Taami go to the city in the first place? Can they overcome this dull and long-lasting period cheerfully?