The mystery has been solved; the hand belongs to Risa. 
Okay, I squealed at reading that and then went into a large phase of happy silent joy! That has made my day! I'm now in a state of bliss.
I knew it, I just knew it had to be Risa and no one else! *insane cackle*
So EYN has retained the status' of my favorite song as well as being my dream song.