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 anscestor 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 swallowed the pitch black burning flames up but was threatening to swallow his student. Naruto tried to struggle against the Kamui's force but it was just too a 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 Kamui and Naruto ended up in our favourite pirate Luffy's world.

-With Naruto-

Naruto's eyes hurt for some was on the shore of an island he did not know.
"Oww..feels like the time I fell into the sack of chili powder.", he peeked and saw a glimpse of crawled over to the
water and tried to wash his he could finally look, what he saw shocked him like hell.
"What the fuck happened to my- my eyes?"
He saw what looked like Nagato's Rinnegan but he also had tomoe on the background of his eyes were black with red rings and white tomoe.
'Is this some form of Rinnegan?', he wondered.
'No, Kit.', said a all too familiar voice from within him.

He was in his Nine-Tails was in front of him, sealed in it's cage.

'What is it , Kurama?', he Nine-Tails, known as Kurama, was smiling at 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 no longer fought against each other but had joined forces 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 a few more days.
'Kekeke...', cackled the beast, causing Naruto to sweat drop. No matter if they were new allies, Kurama still managed to creep the life out of Naruto.
'Would you stop that?', snaped a mad Naruto.
'Kekekekeke...it's something beyond the Rinnegan, seems Kakashi's Kamui altered your Senju blood and fused your dormant Rinnegan with the Sharingan...'
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.
'And more.'
'...I can finally beat Madara.'
'Umm about that...'
'Hm?', asked a confused Naruto.
'Well,', Kurama sighed,'Kit we are no longer in the same place, remeber?Kakashi's Kamui swallowed you up.'

Naruto was shocked remembered being hit by the Kamui.'No! I'll- I'll just warp my self back!'
But Kurama told him how his Rasengan had changed his destination and how he ended up here randomly.
'What do I do now?', asked a depressed Naruto.
'Well Kit, don't be so upset,' Naruto looked up and glared at 't be so upset?How the FUCK did Kurama think that he couldn't be worried? '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 something better than being a person who looks for hope in nothingness.'
'Hm, but first I have to find out where I am.'
'Are you that stupid?No- sorry I take that back- you're somebody for your location!'