The theme song used for the Japanese release of the GameCube version
was sung by then up-and-coming Jpop group, day after tomorrow.
 The song talks about young love and the promise young couples make, to 
keep their love strong.

 The mid-tempo song is written by the group's vocalist, misono, aka Misono Koda
and is composed by the keyboardist, Daisuke Suzuki.
 The song is included in the group's sixth single entitled, "moon gate," and serves
as the first track.