He traveled to another world and became the adopted son of the Fourth Hokage, and the older brother of Uzumaki Naruto. He missed the day of his brother's birth due to his mission. After returning, he originally planned to make it up to his brother, but what he saw was his brother's miserable life. 

A childhood labeled as the demon fox, messy clothes, expired milk... 

Sato Akira was furious, "Sarutobi Hiruzen, is this how you fulfill my parents' instructions?" 

"This is the Konoha that my parents fought to protect?" 

"What is the need for such a Konoha to exist?" 

"Protect Konoha? How ridiculous!" 

Sato Akira looked at Naruto and sneered, "Let's turn evil, Naruto." 

At that moment, Naruto completely turned into a tailed beast. From then on, Konoha lost a genius ninja and a Nine-Tails Jinchuriki, and gained two terrifying avengers.

Main characters: Sato Akira, Hinata

Chapter 47 - Author