Song: get real
Artist: moumoon
Album: Flowers
imeem: Link
Lyrics: Link

It's in Japanese.

I've also been listening to this:

Song: AINOOTO English ver.
Artist: moumoon
Album: EVERGREEN
imeem: Link
Lyrics: Link

I like the song, but I'm not so sure I like the anime. Also don't ask me why the song with the English title is in Japanese and the song with the Japanese title is actually in English.