If you are looking for this track, it is widely available on major digital platforms:
: You can listen to it on Spotify, Apple Music, and YouTube Music. YUI - Good bye Days MP3
by the Japanese artist YUI is most famously known as the theme song for the 2006 film Taiyou no Uta (A Song to the Sun), in which she also starred as the lead character, Kaoru Amane. If you are looking for this track, it