"15 years of dreams" ??
I'm sorry, but that's one of the most cliché, obnoxious things I've heard in a long time...
What's wrong with "Ayu's 15th Anniversary" or "15 years of Ayu"? Ayu's always saying how she wants to be true to herself, not to be seen as a product.
"I don't have dreams. How can I say it? I myself am a dream." - Ayu
I don't want to be mean, this is just my opinion. Other than that, excited to see what you're up to