Naruto! I Infiltrate Konoha to Raise Naruto and Tear Danzo Apart

[Redemption + high intelligence without making characters act stupid + addressing the original's regrets]

My name is Uzumaki Ye, a Konoha shinobi personally “brainwashed” by the Third Hokage and assigned to care for the “Child of the Nine-Tails,” Uzumaki Naruto.

I clumsily cook for him, shield him from every bit of garbage when he's bullied, and take him to eat the best Ichiraku ramen.

I'm the only light in Naruto's life, his most dependable big brother, Ye.

…

That's how I want the world to see things.

But my real identity is Uchiha Obito, a dead soul who should have stayed dead, a sinner seeking redemption.

In public, I spend my days playing with Naruto in Konoha. In secret, the subordinates I've gathered, the Akatsuki, are fighting for me on the other side of the world.

I've deceived everyone for one insane goal: I will unite the entire shinobi world and reshape it into a perfect world where she can return without fear.

They call me a demon, or a savior.

But everything I've done has been for one thing alone… redemption.

On the battlefield, the shinobi of the world are no match for the mysterious masked man. Just as everyone falls into despair, Naruto, the perfect Jinchuriki, turns the tide and fights the mysterious masked man evenly, shattering his mask with a single strike.

But the face beneath the mask makes him tremble.

“Big Brother Ye…!”

Obito looks at him calmly and points a finger at his forehead.

“I'm sorry… Naruto… This is the last time.”