2005年12月14日発売 15th Single ( ゲームソフト『KINGDOM HEARTS II』テーマソング)。PVは北京で撮影された。宇多田ヒカル自身の振り付けはダンサーの振りを見て、自ら考案。アニメパートはUtadaでもコラボした森本晃司氏が担当。
-----
Utada Hikaru - Passion ~single version~
Hikki's 15th single, released on Dec. 14, 2005 (also the theme song for the "Kingdom Hearts II" video game). Shot in Beijing. Hikki observed the way her backup dancers moved to choreograph her own movements. The anime part was done by Koji Morimoto, who had collaborated with Hikki in the past.