Killer B took Naruto along when he left.
"Nine-Tails Jinchuriki brat, from here on out, yours truly will teach you how to use tailed beast chakra and all the tricks that go with it."
"Tch, quit calling me the Nine-Tails Jinchuriki brat, okay? I have a name too! I'm Naruto Uzumaki, you dumb old man!"
Killer B said nothing to that and simply told Naruto to follow him.
The two arrived at the Waterfall of Truth, where Killer B had once trained to use tailed beast chakra.
Killer B briefly explained how the Waterfall of Truth worked. Put simply, a manifestation of all the person's dark thoughts would appear inside the waterfall.
As long as you could defeat him, you would gain better control over the tailed beast chakra inside you.
"All right, Naruto. Sit there and close your eyes. You might see a few truths for yourself."
Naruto sat on the ground. Before long, another Naruto emerged from beneath the waterfall opposite him, muttering over and over.
"Why? Why did those people treat us like that? What did we ever do wrong?"
Dark Naruto had arrived. Seeing someone who looked exactly like him, Naruto found it a little unbelievable. The moment that thought crossed his mind, he gave himself a hard slap to snap himself out of it.
"How could I say something so brainless? What do I mean, someone who looks exactly like me? Doesn't my big brother look exactly like me?"
"Hahaha! I'm you! I'm the real you! Thanks to this Waterfall of Truth, I finally get to come out and see the sun."
The version of "himself" before him left Naruto utterly confused.
This dark version of Naruto was the truest Naruto. He was the part that could resonate with the Nine-Tails, a manifestation of all