「Utada Hikaru SINGLE COLLECTION VOL.2」のリード楽曲としてデジタル先行配信リリース。宇多田ヒカル(宇多田光)初監督作品。表現者としての「宇多田ヒカル」がコンセプト。 ----- Utada Hikaru - Goodbye Happiness Pre-released digitally as the lead single of "Utada Hikaru SINGLE COLLECTION VOL.2." This is also Hikki's directorial debut. The concept is "Hikki as creator."