It was the 4th Great Shinobi War, Naruto was trying in vain to hold off Uchiha Madara.
"Foolish boy, you can't hope to defeat me.I am the founder of one of the most powerful clans in shinobi history.", said a bored Madara.
"Shut up, old man!I'm Uzumaki Naruto, future Hokage of the Leaf!It's my mission to defeat you!", The Uzumaki retorted.
"It's time to end this foolishness.", the Uchiha ancestor said, brushing Naruto's declaration off."Amaterasu!"
"H-huh!?"
"Naruto!Watch out!", Yelled his sensei Kakashi, " Get out of the way!Kamui!"

Kakashi's Kamui succeeded to swallow the pitch black flames but threatened to swallow his student. Naruto tried to struggle against the Kamui's force but it was just an attempt to change his doomed fate he used his favourite technique at the vortex.
"Rasengan!"
The vortex swallowed him up but the Rasengan's energy altered the destination of the blonde ninja.

-With Naruto-

Naruto's head was spinning and for some reason his eyes hurt.

He could make out the shore of an island.
"Oww..feels like the time I fell into the sack of chili powder.", he strained his eyes and crawled over to the water and tried to wash the dust away from his saw his own reflection and froze.
"What the fuck happened to my- my eyes?!"
He saw what looked like Nagato's Rinnegan but the background was black with white tomoe.
'Is this some form of Rinnegan?', he wondered.
'No, Kit.', said a all too familiar voice from within him.

Suddenly, he was in front of the Nine-Tails, in his mind-scape, sealed in it's cage.

'What is this , Kurama?', the Nine-Tails, known as Kurama, was smiling at him in its creepy way.

"Why are you smiling?", said a enraged Naruto."We're trapped in the Kamui Realm and my eyes look weird."

Kurama had told Naruto all about it's past, about the Ten-Tails, The Sage of Six Paths, about The Senju and Uchiha rivalry and much more about the history of no longer fought against each other but had become had also promised that after the war was over, he would free the great beast but as you can see, they were no longer in the Elemental Nations , so they were pretty much stuck together, for the the time being.
'Kekeke...', cackled the beast, causing Naruto to sweatdrop. It didn't matter if they were allies, Kurama still managed to creep the life out of Naruto.
'Would you stop that?', said a maddened Naruto.
'Kekekekeke...it's something beyond the Rinnegan, seems Kakashi's Kamui altered your Senju blood and fused your dormant Rinnegan with Sharingan power...'
Naruto stood gaping at the beast.
'In short,', Kurama, still smiling, continued,'it's both.'

For a moment, Naruto stared at the fox with his jaw on the floor.
'You mean I can use Pain and Itachi's techniques?At ONCE?', said the blonde.
'It sounds lame when you say it like that but yeah.'
'...I can finally beat Madara.'
'Umm about that...'
'Oh!I forgot!We're trapped in the Kamui Realm right?', asked a confused Naruto.
'Well not exactly,', Kurama sighed,'Kit we are no longer in the world of ninja,Kakashi's Kamui swallowed you up along with your Rasengan and Madara's Amaterasu ."
"So?He'll probably send a clone here to get me back."
"First, do you see horrible black flames trying to burn you to ashes?"
"No."
"Second, did you expect the Kamui Realm to be this pretty?"
"Um, pretty?" Naruto looked around. "Er, no."
"Don't you understand?This is a COMPLETELY different place!If Kakashi sent you the Kamui Realm then there would have been bones and dead bodies all over the place!This however strikes me as a separate world."
"But..but...but…but…."
'What?!', asked a furious Nine-Tails.
"How do we get back!?",
Naruto looked up and glared at Kurama.
Kurama sighed.'Listen you were unconscious,I did some 't you see Kit?This could be your only chance for a happy life!You know your life was hell anyway.'he continued,'Your childhood destroyed, the girl you loved didn't care about you, your best friend wanted to kill you and don't get me started on on your family!'
Naruto had to admit, Kurama had a life WAS like a twisted soap opera+tragedy+action film.

'So... what do you think I should do now?'
'Start a life that revolves around relationships that have true meaning and for the sake of Kami, STOP being USED like a tool!'.
Naruto pondered these things and looked up after a while. 'You're could be a new beginning for me, but first I have to find out where I am.'
'Then get up. We've got a lot of asking around to do.'
" I wonder how the ramen here must be."
"COMPLETE asshole." Kurama sighed.