Song 4 u is nice, a bit too game/anime-ish for me but it's a theme song so that's no surprise XD
Missing is nice too, I like the build-up. It's not her best to me as some people have been saying, but it's nice.
Melody is bland to my ears. The melody and lyrics don't stand out to me.
Overall, it's an alright single to me (I refuse to call this an album XD). I don't understand why some people call these songs reminiscent of the 'old' Ayu though, but to each his own I guess
