nice work, I agree with the other comments. Although maybe I've been jaded by the stuff that pops up on newgrounds, but the first thing I thought when he got the note was that the tree was anthropomorphic and had sent it. Then the weird shit starts happening...

Anyway keep it up

That was a cute animation, it was cheesy and it had some fun sound effects. The animation could use some work here and there, but overall, I liked it and I like how you went with this. By the way, the girl's book keeps changing colors from blue to white, I don't know if that was on purpose, but its something I noticed.