The note can be found in Tanagra Town, in a house at the top of the tree structure in the middle of town.
Look at this place. I'm king of the god damned world up here! Who threw the magic beans under my childhood town? Guess a little radiation goes a long way around here. Well, maybe that and some government bullshit. Not sure how you end up in a world like this without the good old government bullshit.
You know, I came here to say my goodbye's and fuck you's to the world, but now maybe I'll stay a little longer. I got a room with a view, and I can't wait to take a piss off this thing.