Doppio again, and Anime set in a specific provincial city

I like the story of “Doppio” in the animation Nichijyo (=Daily ).The story is about the protagonist who struggles to order coffee at a coffee shop and fails even more. When Starbucks coffee was made in Japan, I think everyone Japan had this experience.Now there are cups lined up with the letters “short” and “Tall” written on them, but at first they only had “T” and “S” written on the menu.　( ｉдｉ ) I don’t know!In Japan, there were often Starbucks in the highway service area, and the restaurants were full, so I got entered.　What is “T”? I remember asking