Naruto: The Uchiha Turn Back Time to the Night of the Clan's Downfall

Bad news: He's transmigrated into the Uchiha clan, and the massacre is only three days away! Good news: He's awakened a System that lets him lead the whole clan through unlimited regression! When Uchiha Xuan regresses for the first time, he tries to prevent the massacre, only to be killed by Itachi and the Masked Man working together! What he doesn't realize is that every death makes the entire clan's combat strength skyrocket! The battle experience of a hundred elite shinobi is shared by everyone! When the entire clan awakens the Mangekyo Sharingan and everyone can manifest Susanoo, they fight their way from the Night of the Nine-Tails back to the Warring States era! This time, standing before Madara Uchiha is the entire Uchiha clan, having undergone ten thousand cycles and transformed into the ultimate think tank! "Madara, this time, someone else gets to dance!"