You were turning from a mission and using the shortest way to return leaf village, the forest way. You felt like someone is following you but cant see anyone behind yourself. Just some like rabbits, birds and bats...Bats? Yeah, a bat was clearly coming after you and you realized it as a ninja. You threw a kunai to it but the bat escaped from kunai and it/he turned into his wampire self.

"Did I just caught by a little girl? What a shame!"