Luna decided now would be a good time to transform back to her original form.  She'd stayed in her idol form for too long, and was getting tired.  Since there were people nearby who didn't know she had an alter ego, she meandered off when no one was looking, and upon finding a safe spot, reverted to herself.  She leaned against a wall and let out a sigh. Something was troubling her, that much was certain, but she wasn't about to let the others know that.  Instead, she was going to wait nearby until she had cheered up a little. She was close enough to Ace and the others that it wouldn't take long to find her at all. and she'd be able  to join them when they leave.