Ayu doesn't have many B-sides. She always put almost all songs on her albums so A B-sides would have a few tracks if it was released recently.
Well some songs that could be included:
-Two of us
-LOVE~destiny~ (it surely isn't a B-side but was never featured in any album)
-LOVE~since1999~
-ever free
-Someday My Prince will come (?) (I never listened to the whole version hahaah I wish I could...)
- A (with m.C.A.T)
-Endless sorrow (Original track) (also it surely isn't a B-side but the version on I am... is not the original....and the original is a whole lot better hahahah)
any others?!?!?....
Most JPOP artists though have tons and tons of B-sides...I think Ayu is one of the few exceptions out there!
btw that's one cool cover!!