Wow, I love the sense of nostalgia invoked. The tasteful music, the peaceful tea shops, and the well-written dialogue work in concert to create a great atmosphere.
I think the story can be extended upon, and perhaps more hints on what exactly happened and how people reacted would be great. Introducing more movements in the environment can make the scene feel more lively as well. Some restaurant ambient sounds maybe?
Very lovely. Makes me want to get some good warm tea and reflect on my past now.