Now I know why I love ED4 so much... it's practically the thoughts of an osananajimi. Well, that's not necessarily true, since the 'singer' of the song could simply be a 'best friend' character, but c'mon now, this is Japan; the 'best friend of the opposite sex' character is almost always the osananajimi lol.
In any case, I really like the lyrics regardless. Kinda ironic its a bit sad considering the very upbeat tempo of the song. XD
Thanks to Sub Smith for the entire translation of the song. The translation (and soft sub for the matter) is
here, and I'm sure if you can get fansub anime, it should be trivial getting the original PV itself.