I own almost all of Ayu's singles between 1999 and 2003. One of my most played releases out of anything I own is A. I would strongly recommend the A single. I love it. It has such a mysterious, 21st century vibe. It comes with a lot of songs too.
My second recommendation is SEASONS. You get acoustic orchestra versions of SEASONS and TO BE, then you get the badass D-Z BLUE SUNBEAM remix of SEASONS, and then the grand finale of ever free HAL's mix 2000. I consider those the highlights.
I have to say, I recently obtained the M single and I was disappointed. I didn't really enjoy anything on that single.
