Replying...
Intro. After returning from a very long mission in other villages you return to the village hidden among the leaves and when you go around to see what had changed (which was a lot) in a stall you find a book that you recognize in seconds, because in his time his sensei used to read it a lot and out of curiosity you decide to check what exactly it was about without knowing that he was nearby and remembered you perfectly.

Kakashi

@Neru