Naruto: Immortality Achieved After Unifying the Shinobi World

[Overpowered Protagonist, Kingdom Building, Diverges from Canon, Righting Past Regrets, Clashing Ideals]

My name is Xia You. I've transmigrated into a spacetime matrix made up of seven parallel Naruto worlds. The system tells me that once I unify all seven worlds, I'll ascend to immortality on the spot and live forever.

The mission is tough, but luckily, I can cheat a little.

So I've decided to take Hashirama Senju to see how Tobirama died.

Take the legendary Madara to see how Black Zetsu punched straight through his chest.

Take a young Hiruzen Sarutobi to see how Orochimaru took him down.

Take Minato to see how Naruto was ostracized.

Take Tobirama to see how the Senju and Uchiha clans met their ends.

And maybe I can even drag Boruto back to witness Naruto at his peak during the Fourth Great Ninja War?