The deceased brother became the fourth generation Hokage in the world of Naruto.
The younger brother who was still alive made a machine against the will of heaven to resurrect him.
But in the end, people cannot fight against the sky, and they end up failing.
However, in another space,
The brother who fights to protect Konoha with only a lone soul left of the Nine-Tails,
But he rescued his younger brother and said:
Go to Naruto World, that's my favorite world!
So the protagonist was born in Konoha - and became... Sakura's younger brother? !
(The male protagonist is a bit in love with his brother)