All credit belongs to Namco.

Vocals by Saki Kabata (Courtesy of For Life Entertainemnt, Inc.)
Lyrics by Yoshihito Yano (Namco Ltd.)
Music by Yoshihito Yano (Namco Ltd.)

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From a comment, years ago:

This song is about two lovers. The singer is singing about how it's in her lover's nature to roll and wander around, and eventually apart from her. She accepts this and waits for her lover, because she knows that her lover will always



eventually



come



rolling



back



to her.