I do not own Naruto or Gantz, this story is purely for the enjoyment of the fandom.

I was searching for some crossovers between the Naruto and Gantz's universes and was quite disappointed to find that there was barely any fiction in the fandom. After some thoughts, I decided to write a crossover myself. I don't know if there's a big community willing to read a GantzXNaruto crossover though, but I certainly hope so.

By the way, English is not my native language so please remain indulgent on the matter.

Enjoy!

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Shinobi in the world of the Black Sphere

Chapter 1 : Encounter with the Black Sphere

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"Have a nice day," Naruto exclaimed cheerfully. "I hope you'll like the cinnamon bears".

A huge smile was stretching the blond lips in the candy shop 'Gama Candy'. No matter how much time had passed since he opened the business, he was still glad to provide such great treats to any of his customer. The fact the old man he just served strangely made him remember of one Hiruzen Sarutobi with his positive and generous attitude also helped in the matter.

Now 20-years old ‒he was closer to 21 in fact‒, Naruto stood at one meter seventy five centimeters tall. He still had his short blond hair, deep blue eyes and the three whiskers marks on each of his cheeks ─the scars were quite the eye-catcher and Naruto was sure they were responsible for at least half of his store's popularity─. He was wearing a single-color pale pink apron over a long-sleeved white T-shirt ─it served to keep his arms clean for his job─, a light blue trouser and regular white closed shoes.

"I'm sure I will," the old man simply answered with a keen smile. "It's not often I can satisfy my greed of sweets with my health and I planned to fully enjoy it. Expect me to come back soon!"

"Yeah. Not many candy shops make their sweets while taking into account people health's problems. Thankfully when I opened this store I promise myself that I would be able to satisfy any person no matter their food restrictions".

The old man approved enthusiastically.

"I'm sure glad you did!" he mused aloud before passing the door and finally exiting the shop.

The bell rang once the door closed and Naruto could finally be found alone inside the two-storey house. The 20-years young man sighed tiredly, a touch of melancholy gaining his sky blue eyes.

Four years already that he came into this strange but pleasant dimension. After having the Kyuubi extracted from within his belly, he later woke up in this new world. He did not know what happened to Sasuke and the others… The Rabbit bitch probably took care of them and they were each living in their own dream. Who knew, maybe the life he was currently living was a dream too? Although the Mugen Tsukuyomi had been supposed to erase his memory of it being an illusion which it did not. He was pretty sure the life he was currently living was real but he sometimes wondered. In any case, no matter how many times he tried, he never succeeded shattering an illusion if there ever was one nor did he managed to find any clue indicating how he ended up into this place.

He missed his friends. He got a good situation here as a shop owner and made few friends but none of them were really close. The fact he decided to keep his story and skills secrets from all had not helped but he did not want to end in asylum or on the run. He read the stories people here called fictions and it was plenty enough to warn him about the dangers of being an 'abnormal human'.

After some more seconds of self-meditation and a quick check on his watch, Naruto decided to call it a day. It was almost five in the afternoon already and he was growing quite tired.

He went in the front of the store and turned the sign from 'OPEN' to 'CLOSED'. He closed the blinds placed to prevent the heat from coming inside and then pulled the shades at the front. He finally went to the air conditioning and set the right program for the night. Summer was particularly intense this year and he was forced to maintain a cool temperature to prevent the sweets from melting and/or deteriorating. He finally went to the staircase in the back of the shop, cast a last glance around the quiet room before clicking off the lights and climbing to the first floor.

The upper level of the building was his home. It made things easier living at his workplace and he really liked the location. Shinjuku was a lively place with many different people passing by. His house was right at the end of the main street and business was good. He did not really need the money, having stolen ─hum, borrowed─ a lot of it during the first month he arrived into this world but he enjoyed the job. He hesitated at first in opening a ramen stand ─Teuchi and Ayame would have been so proud─ but decided against it in the end. There were already lots of them in Shinjuku and he wanted to start something new.

He made his way to the living room upstairs, dining quickly before taking a shower. His living place was pretty casual but efficient with two bedrooms ─you never knew what might happen and being a shinobi required a lot of foresight─ a bathroom with bath and shower and a very large living room, probably able to welcome at least twenty people. The kitchen and living room were in fact one same space with a bar making halfway the width of the room being the only separation between both. Huge and comfortable sofas and chairs ─a couple of each─ were disposed around a wooden coffee table. In addition, a large bay window connected the living room with the balcony where various plants and a dining table stood.

In two words, the place was comfy but well-organized. There was no sign of Naruto's job on the upper floor, the desk he was working on and the kitchen to make the sweets being downstairs. Naruto made a point to clearly separate the two ─it was already enough living and working in the same place─.

After exiting the shower, he went to his bedroom, the larger one of the two in the house. He cast a quick glance while entering toward the door at the left leading to the sole room in the whole building that was protected with invisible seals and contained what was left of his past. Some kunai and various shurikens, the contract with the toads ─after coming here, the scroll became ineffective and he just kept it as a reminder─, his old clothes that were ripped apart mostly, the total collection of the Icha Icha Series that he never dared to publish here and two forehead protectors ─one with the leaf symbol and the other with 'Shinobi' engraved on the metal plate─. There were also various seals as failed attempt to go back to the Elemental Countries but he had already burnt most of them.

Naruto sighed and glanced away, his gaze traveling across the bedroom. A double bed, a desk next to a very large closet and a bedside table. The room was an image of the entire house, effective, simple and comfy. He went to the desk in the bedroom and took on it the sole book there was. He applied a touch of chakra on the cover to reveal its real content.

Since he came here, he decided to write down his story in something akin to a diary but with much more information about his world. He was afraid that one day, he would forget it all and think that all that happened to him was nothing more than a dream. Even after finishing the part of his shinobi career he kept writing about his days in this world, adding a line or two nearly each passing day.

For today, two short lines were enough.

Monday. The new method for cooking salted butter caramels is a success. Not as many customers as usual but it had to be expected considering the rainy weather.

Nothing major. Just the regular.

Then, he went to bed.

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The week passed without incident and soon, week-end was here. It was a beautiful day with a sunny weather and warm temperatures. Naruto opened the store earlier than usual the Saturday but closed it at noon and did not work the rest of the week-end.

The sells had been good this morning. The old man from last time came back to buy more sweets, having greatly appreciated the previous ones. Some kids and many strangers also passed by and the blond took pleasure conversing with them. He always liked meeting with people with different cultures and learning their stories in a few words.

It was almost noon when it happened. The first sign were the cries rising through the air that reached Naruto's ears. The former shinobi raised his eyes and saw the second sign through the windows. Many persons were running in one specific direction in the streets.

Something was definitely off.

Two kids were still in the store and turned quite nervous regarding the situation. He ordered them to stay in the shop while he took off his apron and made his way outside to have a look on what was going on in the main street of Shinjuku.

The sound of a machine gun reached his ears once he stepped out of the building. Warning bells rang in his mind and he immediately noticed that people were not running in a specific direction. They were running away from one specific direction.

It was certainly not some kind of event to attract people.

He frowned and let his instincts took the lead. The ninja immediately sprung into action. He quickly went the opposite way of the fleeing people, following the sound of bullets being shot and cries of fear and pain.

While on his way, he noticed several people bleeding with open bullet wounds. The more he went on and the less there was people in the streets.

A minute after leaving his shop, Naruto finally came upon the reason of this situation at a crossway. Lots of people were lying dead on the street. It had been a long time since the former jinchuriki had not seen that many dead bodies.

In the middle of the copious amount of lifeless corpses, only two were standing.

One was pretty tall, a black coat covering his entire form and the machine gun in his hands informing the blond that he was the perpetrator of this carnage. Only his face could be seen, revealing his black skin and sunglasses over his eyes.

The other one was young, probably no more than 18. A high-school student perhaps. He had short red hair, brown eyes and particularly thick eyebrows ─not as much as Gai or Lee though─. He was wearing a large white jacket and a black backpack. Considering his posture, the boy was obviously trying to fight the other one.

It was courageous of him but also stupid. What could a civilian boy do with his bare hands against the might of a machine gun and without surprise effect?

Despite the situation, Naruto allowed a small smile to grace his lips. He was already fond of the boy and would try to not let him die. He was further surprised when the kid suddenly charged at his opponent. The kid was soon shot in the shoulder and forced to his knees before having the machine gun pointed directly at his head.

Naruto decided to immediately intervene before anything permanent was done. However, what happened next completely stopped him in his tracks.

The red-haired boy suddenly raised an arm as if he was trying to grip the man in spite of the distance separating them. Naruto's eyes widened with incredulity when the black guy began rising straight into the air, losing the machine gun in the process. However, it did not appear like he was doing it on purpose considering the surprise spreading over his face the same way it did on Naruto's. No, it was the young boy's doings.

Like magic, the red-haired kid was lifting the murderer with the sole strength of his mind.

Standing still, the Uzumaki could barely believe his own eyes in front of such a feat. Did this boy also had a chakra circulatory system? He had never met anyone in this dimension who could do something like that yet but this boy was obviously different from the others. Perhaps he was not the only shinobi here like he had previously believed.

It was because of his surprise that Naruto did not react early enough to stop what happened next. Still in the air, the black-skin guy had managed to reach for another gun inside his jacket. With an impressive twist, he oriented the barrel of the gun at his opponent and fired.

The boy did not even have time to look surprised before the bullet penetrated then crossed his skull. He instantly lost his focus and collapsed to the ground.

The man suspended in mid-air brutally fell down toward the hard floor and crashed with it. He had not been high enough to break something but he still felt the shock with the concrete.

Naruto mentally cursed himself for not acting sooner. He had been so shocked that he had not reacted immediately to the threat. Was he rusted as a shinobi? Or had he expected that kid to move aside from the obvious bullet coming his way? If he had been a shinobi, there was no doubt that the kid could have dodged the shot. Even Naruto could not track bullets but every shinobi worth his salt could have predicted its trajectory looking at the cannon of the gun.

The red-haired boy was now lying down motionless on the floor, a hole in the head. The man to blame for this carnage carefully brought himself to a sitting position, wincing all the while and then let out a long sigh. When he raised his head, his dark eyes finally landed on the figure of the candy shop's owner.

Surprise and slight panic reached his face. He cast a glance around, noticing the machine gun that he had dropped earlier and seized it. He immediately directed the weapon toward the newcomer and pressed the trigger to deliver a barrage of bullets.

None of the shot hit their intended target. In front of the man, the shinobi simply vanished. He blinked owlishly and a second later, could sense sharp metal upon his throat.

"Any last word?" Naruto whispered from behind.

The murmur was cold and devoid of any emotion, serving to bring fear in Izumi's stomach. Was this man another freak? First, a gorilla-type guy, then two men who could stop bullets with their bare hands along with being some kinds of telekinesists and finally this blond guy who seemed able to teleport? What was wrong with this neighborhood?

Were they monsters like the ones he remembered in the Gantz room? But he was Izumi. The man who reached a hundred points. There was no way he could lose like that.

With his free hand, he reached for the pistol still hidden in his coat and pointed the barrel toward the man. He acted fast. He could do it.

The next instant and before he could even blink, Naruto simply sliced his throat.

"I suppose you don't".

As a puppet whose wires had just been cut, Izumi fell to the ground, dead. Oceans blue eyes followed his fall until his head hit the hard ground in a resonant sound.

The shinobi inspected the kunai he had used to end the man and was surprised by what he found on the blade. Blood was on it, obviously, but there was also a brown coloration. The blond narrowed his pupils and knelt down just above the dead black man. He turned him on his back and expertly passed his hand over his face. His finger turned chocolate.

The guy's face was under an impressive layer of make-up. The shinobi quickly pulled back the hood and the sunglasses before removing the fake moustache and others cosmetics.

Under all the make-up, he unveiled a handsome white young-man, probably not much older than the red-haired boy who had been killed earlier. He had long dark hair with mesmerized black eyes. He had a lean but muscular build and was taller than Naruto by a few inches.

The former jinchuriki inspected a few more seconds the young killer and let out a tired sigh. He had been just a kid.

"Such a waste," he uttered under his breath while closing the killer's eyes.

He did not know if there had been a goal for this rampage or if it had just been driven by a mad teen. He was just glad it was over. What could drive a kid to do such a thing…?

Naruto then stood up and made his way toward the red-haired boy. He needed to confirm some things before policemen and others law enforcement officers came by.

He crouched on his knees, placed a hand glowing with blue chakra over the boy's forehead and immediately confirmed it. The dead boy had not had any chakra. Naruto ignored how he had managed to do what he did, but it was not chakra related. He searched a bit further but did not find anything indicating that this boy had been in any way different from the other human beings on this planet.

It was on that thought that something completely unexpected and out of the blue occurred. The body of the red-haired kid began to slowly disappear. The phenomenon started with the head but quickly spread over the rest of the body, revealing inner organs and red flesh in the process.

As far as he knew, it was not a common thing for bodies in this world to disappear after death.

Naruto grabbed the corpse and moved it with the intention to stop its evaporation. When he noticed that his own two hands that were connected with the red-haired kid started to disappear too, he grew exponentially worried. He immediately retracted his hands but to no avail. His body kept disappearing, slowly but surely.

It was not a disintegration process though. He could still feel his missing parts. It was more something akin to a transportation or teleportation, a little bit like a Reverse Summoning Technique but gradually.

He kept a kunai ready for use just in case there was something waiting for him at the other end of the teleportation. This was clearly the first time Naruto witnessed something unnatural in this world. A few minutes ago, he had seen a kid lifting another one with the sole force of his mind and now, his body was disappearing.

His instincts and the experience he had gained as a ninja had been awoken and brought back to their peak.

The next time he blinked, Naruto found himself in a room with many persons around. The red-haired kid was with them and, despite being still lain down, appeared, inexplicably, very much alive.

Then he inspected the vicinity with a quick glance and his eyes landed on a large and perfectly black sphere.

What the hell…

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End of Chapter

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I hope you enjoyed. I don't know how well this fiction will be received considering that the fandom NarutoXGantz is nearly inexistent so I hope to receive at least a few reviews.

Chapter 2 is coming in a few days. It's already finished but I need to do some check-ups first before I released it. It's a big one with more than 18000 words.

See you.