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, 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. Good-bye Days - YUI
The song remains one of the most iconic J-Pop ballads of the mid-2000s. It is widely remembered for its acoustic guitar melody and emotional lyrics about saying goodbye and the uncertainty of feelings during a final moment together. Over the years, it has been covered by various artists and featured in numerous tribute performances. Good-bye Days - YUI (Indonesian Cover by Dwi P. Ramanatha) It became YUI’s highest-selling single, with over 200,000
