Disclaimer: First Chapter
Story Start!

A new partner.

While Naruto had been assigned to a job with Dulio, the two of them taking on a mission to the US in order to stop some experimentation that was going on there on the creation of false humans. It was an important mission, and she didn't know why she and Naruto were being seperated. For months now, since their first mission, they had been together for every mission after that.

"Why couldn't I go with Naruto?" Xenovia asked with an unhappy look to her face, one that was noticed and ignored.

"As an exorcist, you won't always be teamed up with one person. Naruto is on an important mission. You'll be taking a mission with Irina today, she has been chosen to wield Excalibur Mimic, a good match for Excalibur Destruction." A higher ranking official stated to her warmly, as a teacher. While there was no coldness or strictness to his spoken word, she could tell that she wasn't going to be allowed to argue either.

This was just how it was, this was her duty.

Still, why was Naruto chosen to go with Dulio?

-With Naruto-

'... It's getting stronger... this odd ability of his... it's inhuman...' Dulio thought as he walked behind Naruto, and felt a burning heat coming from Naruto's skin. When Naruto was a child, he was always more energetic when the sun was up, and when the sun was at it's highest, he had seemingly boundless energy. They noticed that when Naruto was training, he also seemed to get stronger with each passing second while under the sun as well. Since they mostly trained at night after they discovered that fact, and the fact that Naruto became far harder to deal with during the day.

At the moment, only Xenovia and Griselda could stop Naruto using their words at least, and they had never tested Naruto's strength.

That was all that this was.

This high-class mission, a mission only given to top levels of exorcists like himself, was a way to gauge how strong Naruto was getting while under the sun. The difference between Daytime and Nighttime Naruto was already vast enough.

Daytime Naruto - Quick Temper, Simple Minded in Solutions, Unforgiving towards Enemies, Unable to Hold Back, More Likely to Cause Destruction
Nighttime Naruto - More Controlled, Willing to Think Up Plans, Willing to Listen to Enemies, Unable to Use Full Strength, Doesn't Cause Destruction

Naruto's hand started to reach up to use Gram.

"Naruto, don't use Gram, you've got to use only Galatine." Dulion reminded Naruto.

"Tch, fine..." Naruto put his back on Galatine's handle and he walked up towards the front door of the facility.

Dulio looked at the dead guards at Naruto's feet, their flesh starting to burn from being too close to his body. The smell of blackening flesh was horrible, but these false human guards were suppose to be disposed of anyway. They were part of an enemy sect, a division of their people who had gone rogue and made a mockery of God by allying themselves with Stray Devils to create monsterous false humans. Dulio raised his arms as Naruto destroyed the doors with a slash of his sword, and he ducked as part of the door came flying at him.

Naruto had planned on using Gram to just destroy the entire enemy base with one attack.

'I've got to see what he fights like when Xenovia isn't around to control his temper... and... it's getting even hotter...' Dulio stepped back further from Naruto when the heat started to increase even more. Even now, he could still feel Naruto's power rising at a consistent rate of growth. His power's connection to the sun, the white sun on his right palm, he looked as his right palm seemed to glow even brighter as his fingers twitched in desire to use Gram.

More guards showed up, emotionless guards created for a purpose.

"If you want your death to be painless, stop moving forward." Naruto gave the false humans one warning as they approached him with their own exorcist swords. Naruto walked towards them while they ran.

'Their movements are flawless, working together in perfect sync.' Dulio thought as he watched the two guards jump onto the walls and jump again to attack Naruto from both sides.

A pincer attack that didn't work.

Naruto didn't block it or dodge it, with an utter arrogance that Dulio had never seen of Naruto, Naruto had taken the attack as the two blades sank into his skin. Naruto bled very slightly though, and the false humans had their eyes widen.

"Swords without the desire to kill, I won't even dodge such a thing. If you don't come at me with the raw emotion of a warrior, then the most basic of scratches is all you will ever hope to manage." Naruto had a blade piercing either side of his neck, but only slightly. The blades only cut on a surface level, and they were stuck in the muscle of his neck. Naruto flexed his neck, and the guards were unable to pull the swords out of his body.

Naruto swung his sword, and both guards were sliced in half at the waist, in one destructive swoop that cut the walls, ceiling, and floor. Everything that was in the path of the sword was cut, even walls 50 feet away from Naruto had been cut by the slicing wave of the sword.

"Not only is his power rising, but his defense is getting stronger, and his attitude is getting worse... I can see the heat now." Dulio could physically see the boiling heat coming from Naruto, as the blood on his sword started to boil and fade away. The blood on the walls, and on the floor, started to steam away as well. He could feel his own face starting to get red as he himself felt the burning heat, and he raised his hand up and cooled his body down by creating floating ice around him.

The ice sizzled and melted, so he kept creating more so that he could keep walking behind Naruto, and keep him under control.

"I'm sick of walking it's going to be so much quicker to just end this quickly." Naruto stated as he slammed Galatine into the wall, and destroyed both that wall, and every room in that direction. Half of the research facility started to collapse as screams could be heard for only a brief moment, before Naruto slammed his sword into the ground, and cause the very ground underneath them to collapse.

"Woah!?" Dulio jumped and created a strong enough wind to stand on, while Naruto fell down into the darkness, and the other half of the building that hadn't been destroyed collapsed and started to fall into the darkness below as well. "... He's reckless during the day... but this physical might... this facility had to be a good 250 meters wide... and the sun isn't at it's peak yet." Dulio landed on the ground nearby and looked around.

Naruto's power was still growing, even from who knows how far down Naruto fell, the strength of his power growing could still be felt.

Naruto's power doubled.

Naruto's power doubled again.

Naruto's power tripled.

Naruto's power tripled again.

Naruto's power was exponentially rising to the point that not only was Dulio starting to feel it approaching dangerously high levels as they continued to rise. The rubble of the building started to melt around Naruto as the darkness that Naruto was inside of started to fill up to the brim with molten hot lava. Dulio put both of his hands on the ground and created so much ice, but all the ice instantly turned into steam. It didn't melt into water, it changed from a solid to a gas as instantly as he was making it.

'This doesn't happen when Naruto's just walking around during the day... shit, I told him to go all out, is this a hidden ability of that... the sun reached it's peak!' Dulio thought as Naruto's power stopped growing higher, and he saw a bright flash, before Naruto was on the other side of the hole, holding in his hand the charred remains of a stray devil. Naruto tossed the body to the ground, and Dulio glanced up at the sun and saw it move out of position slightly.

Naruto's power dropped dramatically, back to his somewhat normal levels as the heat levels in the air started to drop to manageable levels as well.

It wasn't a Sacred Gear, Naruto didn't have one of those, and that power felt just like Naruto's power as well, so it wasn't a power not belonging to Naruto either. Instead, with each passing second Naruto was starting to lose small amounts of strength. His power was still massive while the sun was out, but now that it was going to start getting closer to night, his power was beginning to go with it.

'... what is worse is the fact that his body heat when he isn't restraining it was able to sublimate my ice... my ice can freeze even fire... his body heat also turned the rubble of the building into lava and that lava had started to evaporate... he evaporated my ice and lava... the wounds he got earlier are also healed. He's only 13... I should request that he only ever be allowed to fight at night until he can control himself.' Dulio thought as his ice started to finally begin to take effect, and rain started to fall from the sky as well by his hand. The lava started to quickly cool and harden, the melted rubble of the facility flattening out the giant crater.

There was no trace that there had ever been a facility on this location now.

"The mission is done... and I didn't use Gram, like you asked... can we go home, I want to be with Xenovia again." Naruto stated as he smiled a little at Dulio, who breathed a sigh of relief that Naruto seemed to be out of mission mode. While the smile was small, the fact he was smiling and his body heat was low enough that he could stand next to people again (though, his body was still heated far more than the above average person right now) meant that Naruto was safe again.

Naruto's power was only going to keep growing, and that was scary.

He was human, but there was no way he could be called that.

'... It's like he's a Super Human, something greater than human but still human... not just that... but he's more akin to the sun itself. A guiding sun for humanity... still, for a second, I saw a glow before Naruto's power exploded like that...' Dulio thought critically as he grinned at Naruto and rubbed the back of his head. "Yeah little guy, but lets get a bite to eat, I bet a nearby city has some awesome food to try out." Dulio offered Naruto.

*Grrrrrrrrr*

Naruto's stomach agreed with that idea.

Chapter End!
Please Leave Me Lots of Nice Long Reviews, But No Flames Please!

Naruto's Power is a Combination of Escanor's Sunshine and Six Paths Sage Mode.
The abilities of Sunshine (without the muscles), with the raw power of Six Paths Sage Mode.
(Lets be honest here everyone, as hype as Escanor is, he doesn't hold a candle to canon Naruto in actual power, but giving Naruto the abilities of Six Paths Sage Mode without serious limits would just make him too OP. While I can easily write a good plot for that type of story, I want this story to take a different direction.)