Just because the song is on an album doesn't mean it isn't a b-side on its respective single.
Wings by Utada Hikaru is the b-side for her "Keep Tryin'" single and it's on an album. It's just the lesser promoted song. Same thing with her Devil Inside single with "Wonder 'Bout" being the b-side/on the second side of the record and it's also on the album. (although it doesn't have to be on a record)
So going by that. I think these are Ayu's B-sides.
Friend
Two of Us
Love ~since 1999~
ever free
Theme of A-Nation '03
GAME
alterna
Will
Beautiful Fighters
Secret
decision
Life
Red Line ~for TA~
Seven Days War
also keep in mind that just because it has a video doesn't mean it isn't a b-side. I'm not including teens because it was a cover she did for an album, and they tossed on an acoustic version on the startin' single.