I first saw this video years ago and was quite moved, especially when I saw a now-deleted comment in English describing the story behind this. From what I understand, the two piano players are a comedic duo called Utchan Nanchan, and the reason people are crying is because they practiced really hard to play this song on their show with the singer, Yumi Matsutoya? Does anyone have the rest of the story? When did this happen? How did the collaboration come about? This is one of my favorite videos on KZbin, and I have always wanted to understand the context behind this beautiful performance. Thank you!