Ah, like the sister thread, this one is tough too, because I really love all of Ayu's songs, but let's see (the songs I chose are the weakest ones - in my opinion - but I still love them):
A Song for XX: from your letter
LOVEappears: LOVE ~refrain~
Duty: girlish
I am...: NEVER EVER
RAINBOW: Close to you
Memorial address: it's my favourite album and I LOVE all the songs on it dearly!!
MY STORY: HOPE or PAIN
miss(understood): Beautiful Day
Secret: Born To Be...
GUILTY: (don't) Leave me alone
NEXT LEVEL: Sparkle
Rock*n*Roll Circus: didn't hear the new songs yet!
Misc tracks: Two of us