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"Sanctuary" is the theme song of Kingdom Hearts II and Kingdom Hearts 358/2 Days, and is used as the ending theme in Kingdom Hearts 3D: Dream Drop Distance. It is sung and written by Utada Hikaru. Its Japanese counterpart is called "Passion", and it reached #2 in the Oricon Singles Chart in 2006.
Both versions of the song contain reversed lyrics, voiced by Utada herself. The reversed lyrics are in English in both versions. They include; "My heart's a battleground" which is played in English even in the Japanese version of the song. The reversed portion of the songs are "I need more affection than you know"; in the "Battleground" sections, "So many ups and downs" and "I need true emotions" are the two other examples of the reversed lyrics.
"Passion" is the original, Japanese version of "Sanctuary"; it was originally released on Utada's Ultra Blue album.
At the end of Kingdom Hearts II, Kingdom Hearts 358/2 Days, and Kingdom Hearts 3D: Dream Drop Distance, a different version, called "After the Battle" is used. This version is much quieter for most of the song until the ending part of it, which uses a faster instrumental than the rest of the song.
There is an instrumental version of the song that is used for the menu trailer of Kingdom Hearts II called "Passion -KINGDOM Orchestra Instrumental Version-".