What makes the second movement even more sad is that Yoshimatsu wrote it while his sister was dying from cancer. I now completely understand where the the whole movement's mood comes from.
The term classical comes from a 50 years long era, which doesn't really represent the musics that came after, which are often named "classical" by extension.
Oh, wait, I was thinking about the Fuzzy Bird sonata x) oh my god, you must think I'm fooling with you. I was in a masterclass last week, so my head wasn't working as it should (because of the fatigue). This piece is available for rental, with the orchestra part, at the website of the composer's publishers (I don't remember the name). If you want this piece with piano, there is a version of it somewhere in Japan (in the site of the publishers also, it think). Rumors say it's not very good.
Oh my god, I'm so stupid! I was completely absorved when I answered! It's Nobuyo Sugawa! Sorry for the confusion! As for the piece, I bought mine (even in Portugal, it's not very expensive).
Interestingly, Yoshimatsu dedicated a wide variety of "bird" works to his late sister. On her death bed, she told him "in my next life, I'll be a bird." To me, his music becomes much more powerful knowing that.
Following on from this, he actually wrote the second movement (Bird in Grief) of this concerto whilst his sister was dying in hospital. He never left her side. The second movement is dedicated to her.