What was the name of that manga?

I remember while I was reading Full Moon wo Sagashite on Manga Fox.com there was always this little bonus manga. It was featuring this guy who wears glasses, and he was a piano student. He was entered in this piano competition, but he was angry because someone pre-choose the song he was playing. The songs name was Kanon, I think. So he's worried because he doesn't think he can get it up on time (Or something like that) and because also in the competition there's this amazing piano player. So he's practicing, then he heads out and sees a girl. The girl tells him she's a tree sprite but actually isn't. And that's all I can remember. I would try to read it again, but Full Moon wo Sagashite got licenced and now I can't see it anymore.