According to Boruto, he burned his life for Naruto and died.
When he opened his eyes again, he went back to when Naruto was six years old.
In this life, he is no longer an ignorant tailed beast.
Carrying the memories of the next few decades, he holds many secrets such as the Samsara Eye and Otsutsuki's bloodline.
But the question is, what should I do if he is still sealed in Naruto's belly?
It doesn't matter!
Taught Naruto the "Spiritual Transformation Technique" with his backhand, carrying the chakra soul out of the body and possessing the yellow dog.
Since then, there has been a mysterious existence in the ninja world, Tengu!
