Naruto: I Told You to Learn Ninjutsu, So Why Did You Unlock Bankai?!

(PS: The timeline before Naruto's birth has a lot of continuity errors and is a mess, so this story follows a timeline of my own making.)

Yu Dao transmigrates to the Naruto world and unexpectedly befriends the trio of Yahiko, Nagato, and Konan.

During a standoff with Hanzo of the Salamander, Yu Dao unexpectedly awakens a Bankai System.

And so, a brand-new Akatsuki is born.

Yahiko: "How can we bring peace to the Shinobi World?"

Yu Dao: "Easy! We just need to unify it!"

Madara Uchiha: "Oh? You say you want to test your Fire Release against mine? You're the gutsiest ninja I've ever met! When it comes to courage, I, Madara, am willing to call you the strongest!"

Yu Dao: "Is that so? Bankai: Zanka no Tachi!"

Ōnoki: "Akatsuki lacks a destructive force comparable to a Tailed Beast. We only need to send a few elite ninja and Jinchūriki to eliminate them!"

Yu Dao: "??? Bankai: Jakuhō Raikōben!"

Otsutsuki: "He's just a beast with a sword. What's there to be afraid of?"

Yu Dao: "!!! Bankai: Shin'uchi: Shirafude Ichimonji!"

Obito: "Next, I'll tell you a story about Kamui finally smiling!"