is the fifth single by Japanese singer-songwriter YUI , released on June 14, 2006, under the artist name "YUI for Kaoru Amane" . The song served as the theme for the film Midnight Sun ( Taiyou no Uta ), in which YUI also made her acting debut as the lead character. Production and Release
The song was written specifically for Midnight Sun to reflect the story of Kaoru Amane, a girl with a rare skin condition (XP) that prevents her from going out in the sun. Good-bye Days - YUI
It became YUI’s highest-selling single, with over 200,000 copies sold . Its popularity significantly boosted her subsequent releases, such as "I Remember You". is the fifth single by Japanese singer-songwriter YUI
Initially signed to Sony's GR8! Records, YUI moved to the main Sony Records label after her debut, eventually releasing "Good-bye Days" through their STUDIOSEVEN Recordings label. Tracklist Details All three tracks on the single were featured in the movie: Good-bye Days: The main theme song. Skyline: A lively, upbeat track. It became YUI’s highest-selling single, with over 200,000