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.
A re-release of her debut indie single track. Cultural Impact Good-bye Days - YUI
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. Initially signed to Sony's GR8
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". Initially signed to Sony's GR8! Records