Naruto: Obito is Reborn, Starting with Double Kamui

That day, five-year-old Uchiha Obito opened his dual Kamui Mangekyō Sharingan.

A beast goes back to the past, even if he changes everything, he is still a beast.

But if a beast goes back to the past and does nothing, then he is even worse than a beast.

That day, Uchiha Obito swore that he would create a world where Rin could live happily!