So ... It probably was a romance, and a shoujo and i'm pretty sure it was about some music band. I don't remember much about it but there was a girl with a guitar case. She was listening to music while shoping with her boy friend.
Second thing i remember is this band (and i think the girl was a fan of them). They were on the roof waiting for the helicopter to pick them up. (i'm not sure if they were waiting but the helicopter certainly was there ).