The song that is most nostalgic for me is Fly high. It was the first Ayu song I'd ever heard and I found it by complete accident, funny how that spawned nearly 11 years of fandom for me

. I'm still in love with it today as much as I was then.
evolution was the first song of hers to really blow my mind (I listened to it not too long after Fly high). I remember having that song on repeat whenever I had the chance. It was also the first PV I saw, too!
RAINBOW. Because it was the first Ayu album I actually bought. I remember being SO excited for it to arrive and listening to it non stop when I got it. I actually managed to damage that copy a few years ago and had to get a new one... Can't have it ruining the look of my collection...
And lastly... Arena Tour 2003-2004. Once again, it was the first concert of hers I'd ever watched and I loved every bit of it. I can never forget that epic performance of Memorial address... It just solidified me as a fan.