During the intro the piece modulates briefly to B major at bar 20, F major at bar 22, and finally gets to the tonic D major at the start of the verse.
The “unlimited” section is in G major, then it goes back to D major when it returns to the chorus.
The following andante section (“well, are you coming?”) returns to the chromatic melody of the intro.
It returns to D major for the final verse (“so if you care to find me”) The final maestoso section is in B minor, before finishing on a D major chord.