I would have to say that my favorite drink there was was 午後no紅茶 or gogo no otcha or afternoon tea. It's a brown milk tea, soo good! I liked it so much actually that I started buying a big bottle of it everyday
It cost 188 yen in japan thats about 2 dollars here. much cheaper here because at the store where i used to buy it in columbus it cost 5 bucks.
it was in a different type of container though, that one is weird looking
