Thirty year old Kakashi was supposed to have been killed by Pein during the Invasion. Instead, he wakes up in the body of his twenty year old self. (It gets a lot more complicated.) Time travel.

COMPLETE. Sometimes, even the softest breath on still water can create tsunamis. Several weeks before meeting his genin team, Kakashi is sent to find a bounty hunter responsible for the deaths of five missing-nin, all rumored to be part of a secret organization. But Uzumaki Kurama is far different than anyone expected, and ripples are starting to spread. Slash/yaoi, time travel