I was inspired to do this story by two things.

1) The only existing Ben 10 and JJK story at the moment; Ben 10 Curses is pretty good in terms of potential, but in execution it could be better. Despite that I find the author's effort,user; Bountyodst, to be very admirable, as it has given me the confidence to try my luck as well.

2) Nobara Kugisaki: She's a great character no doubt. Plus she bears traits that are similar to Kid Ben, and I'd definitely love to see how they would interact with that knowledge.

Disclaimer: I do not own Ben 10 or Jujutsu Kaisen in any way. They are both owned by Cartoon Network and Shonen Jump respectively.

Enjoy!

Chapter 1: Far From Home

Location: Unknown, Somewhere on Earth

Time: Mid-day

It was a calm, sunny day. The weather was cool, and the breeze that came with it brought a soothing feeling to the skin. The surroundings were filled with low but audible murmurs. Our attention is brought to a park, filled with lush green grass and flowers. Though they weren't many trees in sight, they were still a marvel to behold,as they added to the overall beauty of the park.

A butterfly would land on the back of the right hand of an individual who seemed to be male. His face laid flat on the ground, and his arms were outstretched, almost like he was sleeping. This individual was positioned in the middle of the grass but no one else was around him. With a stir and a mild groan, the individual gradually got to his feet, causing the butterfly to leave. Now standing with his left hand scratching his head lightly,the individual's appearance was more evident.

He was a young man, no older than 16. He had combed brown hair, green eyes, slightly pale skin, and had a semi-athletic build. He wore a a black shirt, blue jeans and a green jacket with white stripes on his left sleeve and the number 10 on the right, white socks, and black and white Converse-style shoes. As he brought his left hand to the bridge of his nose, on it is an object that can grab one's attention easily. A gauntlet-like band with a dark green color scheme. It contains a black rectangular button and wrist couplings, extending up to almost half of the boy's arm or forearm. In the middle was a central core that took the form of a green hourglass symbol with black outlines.

This boy was none other than Ben Tennyson and his rather strange device was known as the Ultimatrix,a device of alien origin that grants it's wearer the ability to transform into various alien species. Ben then suddenly groaned.

"I thought waking up in the afterlife was meant to be pleasant. Instead it feels like I barely got enough sleep." Ben eyes which were once squinted, were now opened normally. Upon taking in his new surroundings however, his eyes widened considerably.

"Ok, this is definitely not the afterlife. Looks more like Earth. Question is, where on Earth am I?" Asked Ben to no one in particular. He then began to look around but saw no one nearby.

"Plus isn't it supposed to be nighttime? Huh, something's definitely not right." With a defeated sigh,Ben began to walk away from the middle of the park.

"Might as well look around. Hopefully I'm still in Bellwood."

After a minute of walking,Ben came to a stop at sidewalk where he saw people walking by.

"At least there's people nearby. Though,I don't think I'm exactly in Kansas anymore." As he said this, he looked up to spot a few billboard signs written in Japanese Kanji. Each of them either had a product on it or a female on it.

"Great" Began Ben with a sigh.

"I'm halfway across the world. Though I might as well call in Gwen and Kevin. Make sure they know I'm alright." Ben then cupped the thumb and index finger of his right hand around the core of the Ultimatrix, and twisted it slightly,causing it to glow a light green light.

"Gwen, Kevin, you guys there?" Asked Ben. All he got in response was static.

"You guys, it's me... Ben" Once again,all that was heard was static.

"That's new. Normally one of them answers almost right away. Maybe I should try Grandpa Max." Reasoned Ben. He twisted the dial once more.

"Grandpa Max? Come in Grandpa. It's me Ben." Not only did the familiar static still remain, but a hologram in the form of a 'DANGER' icon displayed on the core.

"I'm having trouble getting through to him too? I've got a bad feeling about this." Said Ben with a tone of worry.

"Might as well try Azmuth, hopefully he picks up this time." He twisted the dial once more.

"Azmuth, you there?" The 'DANGER' hologram still remained.

"No luck getting through to anyone. Might as well do this the old fashioned way." He then brought his left hand back down to his side and put his right hand into his pocket, bringing out a relatively big green phone. He activated the phone, but what he saw put a look of shock on his face.

"No signal? Oh this is definitely not good." Ben then put the phone back in his pocket.

"It definitely looks like Earth. But might as well be sure. Ultimatrix: Activate Universal Translator." The Ultimatrix core glowed a bright green in response.

"Now to get some info from the locals." Ben then walked towards a man on his right who was about to cross the road. The man wore a black business suit,had a mullet cut and had slight wrinkles on his face.

"Excuse me sir, sorry to intrude but if I can just ask you a question. Where exactly are we?" The man looked at Ben quizzically,as he was taken aback by the question. After a few seconds of silence, the man spoke up in response.

"That's quite simple, Young man. We are in Sendai City, the capital city of Miyagi Prefecture,Japan." Answered the man with a small smile.

'That definitely clears up any doubt of if this is Earth, plus he's definitely speaking Japanese as well.' Thought Ben.

"Alright, thank you very much sir." Said Ben with a bow.

"You are quite welcome, Young Man. Say,I didn't catch your name."

'He doesn't recognize me. That's already a bad sign'

"Ben Tennyson,sir." Said Ben with a smile.

"It's nice to meet you, Tennyson. My name is Akihiro Takahashi." Takahashi then stretched out his right hand to shake Ben.

"It's nice to meet you too,Mr Takahashi." Ben shook the man with his left hand, ensuring that the Ultimatrix was covered with his sleeve.

"I assume that you are a foreigner. Judging by your clothing and uncertainty about your whereabouts. Though I will say that your Japanese is quite stellar. I can't even hear the accent in it." Commented Takahashi.

"Thank you,Mr Takahashi. And yes I am,I come from a city called Bellwood somewhere in the United States. I'm actually here to visit my Aunt, but i wasn't quite sure of where I was at first." Said Ben with a nervous smile,as not all of what he said was true.

"I see. Good to know that you have a relative here. I'm also guessing that this is your first time here?" Said Takahashi with a warm smile.

"Yes sir. My family have been planning to have me visit her for quite sometime now, but we never got around to it. At least now I know that all those extra classes learning Japanese are finally paying off." Said Ben with a slightly forced laugh. One that fortunately Takahashi didn't catch onto.

"Indeed. I am quite certain that you'll enjoy your stay here, Tennyson, however long it may be. The city is full of wonders and it's people are just as interesting." Said Takahashi.

"I don't doubt that for a moment,sir." Said Ben with a light-hearted laugh.

"I must be on my way. Once again it was nice meeting you, Tennyson. Take care of yourself and enjoy your stay." Said Takahashi with a smile as he began to cross the road. Once on the opposite side of the road,he waved at Ben.

"I enjoyed it too sir, and thank you. Goodbye." Waved Ben with a smile.

"I'm happy the first person I met turned out to be a nice guy. Though I can't shake this strong feeling of uneasiness I'm having." Pondered Ben to himself.

"Only one way to find out if it's valid." Said Ben as he lightly stoked his chin with his left hand. As he turned around,he saw a woman who looked slightly older than him. She was fair in complexion, had black, shoulder length hair,wore a thick cream long sleeved shirt and a brown skirt reaching her knees. Beneath them were black stockings along with black shoes. She was walking towards Ben, but her attention was not placed on him.

"Excuse me miss." Ben called out to the young woman, causing her to stop.

"Sorry to disturb you but I could really use your help. You see my phone's been giving me a bit of a problem." Ben then brought out his phone from his pocket and turned it on.

"It's been without service ever since I got here, and I really need to check something online. Can you please help me? I promise I'll be quick." The young woman looked at Ben inquisitively, pondering his words.

"Ok, but don't take too long." The woman answered as she offered Ben her phone. It was the same size as his and was pink in color.

"Thank you very much miss. I promise it will only take a moment." Said Ben with a smile as he accepted the phone.

'If I'm not mistaken, the universal translator also allows me to read and write foreign languages so I should be able to search up what I need.' Thought Ben as he opened the woman's 'Google' app and entered the Search engine. The keyboard that appeared was in Japanese Kanji.

"'BELLWOOD, U.S.A." Was what Ben typed with the Kanji.

'NO RESULT' Was the outcome of his search.

'Oh no...Ok,this one to settle it.'

"BEN TENNYSON"

'NO RESULT' Was what met Ben once again. His facial expression was one of utter horror. One that he immediately masked with an uneasy smile as he handed the phone back to the girl.

"Thank you once again miss, greatly appreciate it." Said Ben with a bow.

"You're welcome. I hope you were able to find what you were looking for?" Asked the woman.

"Yeah I was, thank you." Replied Ben.

"Alright then. Goodbye and take of yourself." Said the woman as she waved at Ben with a smile before walking past him.

"Thank you once again, and you too." Waved Ben with a smile of his own. Once the woman was far out of sight, Ben's expression changed into one of dismay.

"It happened again. For the second time in my life." Said Ben nervously.

"I'm in another universe."


Location: Sendai City,Japan

Time: :3:30PM

Ben was seen sitting on a bench in a park far away from a set of individuals who looked his age. His head was slumped down as he looked at his knees. His expression was downcast, and his sadness was evident.

"First,I find out that my Ultimate transformations have been alive all this time, and saw me as their unjust jailer. Then I sacrifice myself to set them free, but instead of ending up dead, I'm still alive. Only in a world so similar to my own but also so different." He then raised his head up slightly.

"And just like before,I can't get in contact with any of my friends and family,nor can I leave to be with them." He rested his head on the bench as he looked at the gradually dimming sky with sadness.

"But unlike before, I'm completely alone."

"You're never alone, Young Benjamin." Said a new voice, causing the teens head to spring forward. His eyes widened as they fell on a man with fair skin, grey eyes, and black hair.He wore a white lab coat over a white shirt with a brown vest and black tie, black pants, and black shoes. He also wore goggles with green lenses around his neck.

"For your friends are always there for you. And they are closer than you think."

"Professor Paradox." Said Ben with a wide smile as he got up from the bench enthusiastically.

"I don't think I've ever been happier to see you Professor."

"The feeling is mutual Ben,as it is good to see you as well." Said Paradox with a light-hearted chuckle,a wide smile plastered on his face.

"At least I know I'm not so down bad on my luck. Now that you're here,I can..."

"I'm afraid that you cannot leave this place Ben. Not anytime soon,at least." Interrupted Paradox with a somber look.

"I don't understand. What do you mean by that?" Asked a shocked Ben.

"When you sacrificed yourself to save the Ultimates, the Ultimatrix was intended to go through a system reboot that would not only free the Ultimates from their captivity but also free you as well."

"Wait, you knew about t...?" Asked Ben only to cut himself short.

"Nevermind. Forget I ever asked." Said Ben, causing a small smile to dawn on Paradox' face.

"Indeed. Moving on then. A malfunction caused by outside forces affected your Ultimatrix and caused you to appear in this world instead. I have reason to believe that the person responsible also bears the ability to walk between numerous realities, but I haven't the faintest idea who at the moment."

"I thought you were an expert on this stuff?" Questioned Ben with a tone of disappointment.

"I possess an in-depth understanding of the space-time continuum, which allows me to travel to any point in space and time, as well as slowing down or speeding up time as i please, correct. However, as I've said before,there are places i cannot go and things I cannot do. And as you can imagine, with those limitations,they are individuals that I cannot fully account for,at least not initially." Answered Paradox.

"Guess I forgot about that, my bad." Apologized Ben with a sigh.

"Oh, your plight is quite understandable Ben, and I hold no ill feelings towards you for it. Now on the matter of whom sent you here, this person has made it so that if I were to extract you from this reality at the moment,it could have untold ramifications as a result." Explained Paradox.

"Really? Why is that?" Said Ben with a worried expression.

"With the efforts of the being that brought you here, alongside your presence here and mine,the fabric of reality is being stretched dangerously thin. If I were to either extract you before it can even itself out now or cause any more alterations to this reality than what I'm about to do now,it could cause a rupture. One that at the very least will cause both of us to exist outside of reality itself." Explained Paradox.

"So I'm like the glue that's holding everything together until it can eventually stick together on its own?" Theorized Ben.

"A rather unique choice of words, but they do bear with them the desired understanding. Excellent choice indeed Ben." Answered Paradox with a smirk.

"Heh" Scoffed Ben with a small smirk.

"Guess I'm not going to be home anytime soon." Said Ben with a now somber tone.

"Wait a minute. You said something about making any more alterations, what do you mean?" Asked Ben, his expression now one of utmost curiosity.

"To better help you adjust to your new life in this reality for however long it may be, I've taken the pains to ensure that records of your existence are credible." Paradox then brought out from his coat pocket a blue ID card. It had a portrait picture of Ben in a white background. It had details such as:

His Name: Benjamin Kirby Tennyson.

Date of Birth: December 27th

With slight reluctance, Ben accepted the ID card.

"You'll also need these." Suddenly, out of seemingly nowhere, several documents in brown envelopes manifested from thin air onto Paradox' hands. He then gave them to Ben.

"What are they?" Asked Ben.

"Records such as your birth certificate, evidence of your guardians, evidence of your education up to this point in time, and many more." Explained Paradox.

"What's my cover story?" Asked Ben.

"The same as your normal background story, only that your family is deceased and that the only surviving relative you have is a family friend."

"Wait... what?" Ben could barely comprehend the thought of living without his friends and family existing. To then have to pretend that they're not alive felt like it was too much for him to bare.

"I understand how this seems Ben but know that this is for the best. The only other alternative is to enlist in the services of select individuals to act as your adopted family. And that would be very unfair to you." Reasoned Paradox.

Ben hated to admit it, but he knew Paradox was right. Having a family pretend to be his own not only sounded highly distasteful to him but he also knew that it could very much upset him even further. And when he considered any other alternatives, this was the best one. After a few moments of silence,Ben began to speak with a sigh.

"Mind telling me who this family friend is?"

"Unfortunately that, along with the many things that exist in this reality are things that you'll have to come to learn on your own. My time in this universe is stretched thin, and I cannot waste a second further." Answered Paradox.

With a bright blue light enveloping the two of them,Ben found himself in front of a cream colored house in the shape of a bungalow,two stories high and with blue roofing as well.

"This will serve as your temporary abode. I believe that it will serve it's purpose quite well during your stay. Before I depart,I must leave you with a few parting words. One of encouragement, and one of warning." Said Paradox.

"What are they?" Asked Ben.

"As I have said before, your stay in this universe is not a temporary one. Once the fabrics of reality even out to a state akin to what they were before your arrival,it should be safe to return you back home. Your friends and family are aware of your predicament and will do their best to support you during these trying times." Encouraged Paradox.

"Really? They know I'm ok?" Asked a very hopeful Ben. His expression then changed into a soft smile and his eyes became slightly watery.

"Though it's going to be a while before we see each other again, I'm glad that they've always got my back." Said Ben softly.

"Indeed they do. Now,on the final matter,it is more of a warning Ben." Said Paradox, his expression changed into a stern one.

"What is it? Asked a puzzled Ben.

"Beware the treachery of the Two Faced Specter" Warned Paradox.

"What?" Asked a dumbfounded Ben.

"Unfortunately this is where we say our goodbyes. Though it will be a while,we will surely meet again. And hopefully then,it will be to bring you home." Said Paradox with a smile as the blue light washed over him. Once it died down, Paradox was nowhere to be seen.

"Guess this is goodbye for now." Said Ben as he then walked towards the door of his new home.

"Might as well start making myself comfortable." Once he entered inside the house,he found the interior to be mostly covered with white and coupled with red floral designs. The furniture consisted of a set of chairs and a table, making up the dining table. A set of couches and arm chairs placed around a flat screen Tv placed on the wall. And a small but well furbished kitchen.

"Not bad." Said Ben as he then placed his documents on the dining table. As he did so,he saw a oval shaped object with the Ultimatrix hourglass symbol placed on the faceplate.

"A Plumber's badge? Why did Paradox leave this here?" Asked Ben as he picked up the device. Once it was in the palm of his left hand,it lit up,showing the hologram of an individual feminine in nature. The individual gasped upon seeing Ben,who in turn also looked completely shocked.

"Ben?"

"Gwen?"

To Be Continued


Thank you so much for reading all the way to the end, it means a lot to me. Sorry if this chapter was a bit short,I wanted to get this story out before the day ended. I hope it did it's purpose of setting up Ben's arrival in the JJK world well.

The next chapter will expand more on how Ben is adjusting to his new life and will also see him meeting one of the members of the main cast in JJK.

Hope you guys liked the reason I gave for why Paradox can't remove Ben yet,or are at least somewhat content with it. I was inspired by the Omniverse episode "Ben Again" on how to go along with it.

Constructive Criticism is always welcome but not flaming.

Thank you once again for reading this far, greatly appreciate it. If you enjoyed this chapter, and would like for more, please let me know, but until then, have yourself a good one.