It remains one of the most covered and recognized acoustic songs in Japan, often cited as a "must-listen" for fans of the singer-songwriter genre. MP3 Download & Streaming Options

It is widely available for streaming and digital purchase on Apple Music and Spotify in most regions.

This track is widely considered a defining moment in mid-2000s J-Pop. It showcases Yui's signature "dry" yet emotive vocal style, accompanied primarily by an acoustic guitar. The song's emotional resonance stems from its connection to the film, where the protagonist—played by Yui herself—suffers from a condition that prevents her from being in sunlight.

"Good-Bye Days" is a critically acclaimed J-Pop acoustic ballad by the artist Yui, released in 2006 as the theme song for the film Taiyo no Uta (Midnight Sun).

The song features a simple, effective progression that builds from a gentle acoustic intro into a powerful, bittersweet chorus.

If you are looking to purchase or download the MP3, it is available through several official platforms: