"Passion" is a song by Utada Hikaru, which was released as a single in 2005. It is the theme song for the video game "Kingdom Hearts II." The song reflects on memories and the limitless and bright future that was once cherished. It describes how under the beautiful blue sky, there was a slight fear and hesitation. The lyrics also touch upon the changes in time and the desire to witness them under a big signboard. The song expresses nostalgia and the longing to remember and hold onto things that couldn't be forgotten, such as a person from the past or things that couldn't be achieved. The lyrics evoke a sense of reflection and appreciation for the past while yearning for the future.
