...is actually a fairly common trick in the circus. It's also the closest equivalent to going backwards in time. So why should only one person go back in time if anyone who knows how can do it? It's just like walking backwards on a tightrope. And more than one person in a war-torn world of Ninja wants to change things. To fix things. Time travel fic.

Orochimaru didn't stop the fight at the Chuunin exams, wanting to see the potential of the young shinobi present. But he had no idea just what kind of effects his decision would have.