Part I - Nope, Not Happening

A self-insertion into the Narutoverse. No one just falls into another world. It just doesn't happen. Not normally, at least. Not even rarely. It's an effect, not a cause. And I should have known that. The signs were there. The warnings were clear. I should have paid attention. No one just falls into another world. No one just falls into another world, and returns, I should say. Because I fell. And returning was impossible. (Rated T, Complete)