Hey Everyone. So as you know. A Ben 10 X Elfen Lied crossover has been going on in my mind for some time now. I read a story called Ben 10 Multiverse One-shots by Humantrix-X-24, and one chapter had Lucy from Elfen Lied. And I have been thinking to myself. "This would be a good story. What would happen if Ben was sent to an alternate version of Kamakura Japan? With the Diclonius?" So I have been thinking about it for some time. And after reading Ultimate Fairy by Ultimate10 and Ultimate Ga Kill by MegaRdaniels. It made my inspiration for the story even more. So as you know. Ben will be in Kamakura Japan, and in an alternate one as well. I mean sure I could have had it take place in the same universe, but it would have made things too complicated. Also, Ben will be paired up with Lucy, Ben will have the new Omnitrix, but will have the Evolutionary Feature added, because seriously, those Ultimate forms were badass and it was ridiculous that Omniverse never bothered using them again. So anyway sit back, grab some popcorn, and let's dive into the story :)

Ben 10 Belongs to Man at Arms and Cartoon Network

Elfen Lied belongs to writer Lynn Okamoto and Weekley Young Jump, and the Anime was produced by Arms and licensed by Sentai Filmworks

Ben Tennyson, the teenage superhero was at the Burger Shack one night chowing down on some delicious Chili Fries and a Burger. After saving the world from Vilgax (again) and getting the new Omnimatrix from Azmuth. There haven't been any reports about alien activity recently, so Ben has been sticking to stopping robberies. That has been pretty much life so far for our young hero, his girlfriend Julie had broken up with him due to the fact that his hero work had made it difficult for her, but they still remain friends though.

"Thanks for the food!" Ben called out to the workers with a smile. They offered to let him have it for free, but he declined and happily paid for them. Oh yea, speaking of...The world was now aware of Ben using his aliens, and that made life difficult at first, what with mercenaries and bounty hunters coming after him. But luckily it hasn't happened for a while now.

As Ben was walking home from the Burger Shack, he noticed a weird glowing light coming from an alley. He got into a defensive stance as he had his hand over the Omnitrix.

"Better be careful." He said as he walked slowly over to the light, thankfully it wasn't an alien monster or anything, but a weird portal. Ben looked at it with awe. "I wonder if Professor Paradox saw this." Ben said, as he got a closer look, he instantly got sucked in with a YELP. And with that, the portal closed up. The hero of Bellwood and the world was gone.

Yuigahama Beach

Two teenagers were standing on the shoreline, one boy, and one girl. One was a boy who had dark hair, wearing a blue long shirt underneath a white shirt, blue jeans, and green sneakers. His name was Kouta, and he had come back to his home of Kamakura, Japan for college. The girl was about his height and had dark brown hair, and wore a pink shirt underneath a brown dress, had knee socks, and brown shoes. This was Yuka, Kouta's cousin.

"Hey, Kouta..." Yuka began as she was looking down. "Do you remember when we used to come here and play as kids? All three of us?"

"Yea...you, me, and Kanae." Kouta then crouched down and looked at the sand. "I remember that on our last day here, she was collecting shells." He remembered that Kanae had shown him some shells, but he brushed them off as not looking so pretty, much to her irate. As he was still thinking about it, Yuka called him to look at the ocean with worry. Kouta looked up and his eyes widened, there was a girl possibly around their age with long beautiful pink hair standing in the ocean...and she was NAKED.

After wondering what was going on, the pink-haired girl rubbed her eyes and looked around with confusion as she let out a noise.

"Nyu?" She said in a soft voice. Kouta and Yuka's expressions became one of confusion, as Kouta was trying to get her attention, the girl looked frightened and she tried to ake a run for it, but she fell face-first into the sand, when she got back up she started crying, like a little kid who fell down for the first time. Kouta didn't know what do, but Yuka grabbed him and dragged him away for a littel bit.

"Kouta, take off your clothes." She said to him. This caused teh boys eyes to widen.

"What? Why?" He asked.

"Just do it!" Yuka said sternly, Kouta sighed and relented.

Nearby Ben was laying down in the sand, he was groaning to himself as he pushed himself up and took a good look at his new surroundings.

"Where am I?" He asked himself, he got up fully and brushed the sand off his clothes. He took a good look at teh beach and sighed. "Litterbugs." He muttered under his breath. "Still though, wonder where that portal sent me, looks like just a regular beach, maybe it transported me to the beach?" He then looekd at teh Omnitrix to get in contact with Gwen, but to his horror and surprise, he wasn't getting any feed or connection. "Crap, whatever this place is, I can't get in contact with Gwen, Kevin, or Granpa."

Ben sighed and realized that if he was indeed in a new world, he would have to make due by himself. Plus being the hero he was, there might be some people to help as well. As he started walking away from the beach he noticed three teenagers coming this way, when he saw them, they seemed to be normal teens, when he got a view of the pink-haired girl, his eyes went wide.

"She looks lovely." He thought. But then a questionable look on his face, why sis she only wearing a shirt? And was she wearing a cat headband? He was a littel nervous to approach them, but suddenly swallow dit and went up to them.

"Hi! Sorry to bug you three, but I am kinda lost and want to know where I am at." He said. He was expecting them to go all fanboy and girl on him, but to his surprise, they didn't and instead, the brown-haired girl smiled warmly at him.

"Sure. you are Yuigahama Beach." She said with a smile, the boy nodded his head and the pink-haired girl just looked at him. "Are you a foreigner?" She asked. Ben looked at her like she was confused.

"What do you mean?" He asked.

"Well, you are in Kamakura, Japan." She said to him. Ben was surprised, the portal he was sucked into led him into Japan? He has never been to Japan before, she was nervous. He simply launched nervously and rubbed his head.

"I guess I am. My names Ben Tennyson." He said as he extended his hand, Yuka, Kouta, and teh pink-haired girl looked confused until they realized that this must be how he meets people in his own country.

Yuka smiled and took his hand. "I'm Yuka, this is my cousin Kouta." Kouta gave a small smile and shook Ben's hand as well. Teh pink-haired girl looekd att he hand curiously and started to hold it and play with it. Ben looekd to them and gave a look as if to say "What is her deal?"

"We don't know exactly, we actually found her a little while ago." Yuka said. Ben looked at the pink-haired girl, who was giggling as she was still playing with his hand he noticed the blood coming down her had a little bit and the horns on her head.

"What happened to her?" Ben thought to himself

Maple Inn

Ben was walking with Yuka, Kouta, and the pink-haired girl. Because he was new to the area, Yuka offered him a place to stay for a littel while. Ben told her that she didn't have to worry aobut it, but she insisted. As Ben was walking with them he took a good look at all his surroundings, he had never been to Japan before, nonetheless city in Japan, and he was blown away by the beautiful scenery and architecture. Also, he was amazed by all the Cherry Blossoms that were scattered through the wind. After a few minutes, they had arrived at their location, which looked like a large house.

"I knew you guys were going to rent me a house. Is this it?" Kouta asked while looking at it.

"It was a traditional Japanese restaurant, but they went out of business a while ago." Yuka explained. Ben was looking at the place with awe.

"Did your mom explain why they closed down?" Ben asked. Yuka put her finger on her chin and thought about it for a while.

"Not really, but either way my mom said that Kouta can stay here as long as he cleans the house every day, he doesn't have to pay rent."

Ben sweatdropped at this a littel bit, he doesn't have to pay rent? Cool, but for the price of cleaning every day? Ben was thinking that maybe it was a good idea that Yuka was allowing him to stay awhile, Ben could help Kouta out with the cleaning.

Meanwhile, he was looking over at teh pink-haired girl as she was looking at teh Cherry Blossoms falling on the ground in awe, he was looking at the horns on her head and was wondering if they were really headbands. He would have teh Omnimatrix scan her to see if she might be some new form of alien. But there was no doubt that he thought she was cute though. He immediately shut those thoughts off though. Not ready for a relationship yet, plus he doesn't even know her that well enough.

"So I'm really just a free caretaker?" Kouta asked disbelievingly. Yuka looked at him and smiled.

"Well, people always say that there is nothing worse for a building than being neglected!" She said chirpingly.

"Who sais that?" Kouta and Ben thought to themselves sweatdropping. Yuka turned to Ben.

"Ben, you don't mind helping Kouta out with the work do you?" Ben would have said something, but she was letting him stay here for the time being, and he was grateful for it as well, since he still can't get in contact with the others, so he smiled.

"Don't worry, I'll do it." He said giving her a thumbs up, prompting the girl to smile at him, as they were walking inside. Ben noticed teh pink-haired girl still looking up in the sky at the Cherry Blossoms, he smiled and patted her on the shoulder and she looked at him with curious eyes.

"Hey, let's catch up with them." He said as he grabbed her hand and they started walking to follow Kouta and Yuka. When Ben felt the girls hand his face felt warm, her hand was really smooth and warm. Ben quickly shook his head in order to get those thought out of his head.

When Yuka opened the door, they all walked inside, but also took their shoes offa t teh door, Ben was confused, so he took his sneakers off as well.

"Home sweet home I guess." Kouta mumbled. Ben, however, looked at him and smiled.

"Don't worry man, as long as I am here, I'll help you out." Ben said with a grin. Kouta returned the grin and thanked him, he then caught sight of a Grandfather clock and walked over to it.

"Wow, this must be an antique!" Kouta said with fascination. Yuka called out that the clock won't' work and that it must be broken since it won't work even if it was winded. "Oh, that's too bad."

Ben smirked however. "Seems like a job for Brainstorm." He thought to himself, maybe at some point while they are asleep, he can turn into Brainstorm and see if he might be able to fix the clock. But then he heard some whimpering and found the pink-haired girl tugging the sleeve of his jacket. "Hey, are you ok?" He asked concerningly.

"Nyuu!" She said. "Nyuu!" She was looking at all three of them and whimpering out the same thing.

"I don't know what to do." Yuka said concerningly. "And we don't even know her name."

"Well all she keeps saying is Nyu...hey, that sounds like a good name for her." He said, with Yuka giving him a questionable look. "What do you think Ben?"

Ben was studying Nyu's habits, it resembled much like that of infants, did something happen to her that caused her to act like this? Accident? Trauma? Ben didn't know, but he wanted to find out so he could help her. Ben was also thinking aobut the name, he guessed that they can call her that...until they figure out her real name.

"I agree, at least till we figure out her real name though." Ben said. Nyu was sighing of relief and joy as she was sitting down. "I guess she likes it." Ben said while smiling, but it quickly faded as soon as he saw yellow liquid coming from underneath "Uhh, guys?"

(Eyecatch of Ben looking out to see a view of Kamakura)

(Eyecatch of Nyu playing with Grey Matter, much to his annoyance)

Maple Inn

Ben was currently sitting in his room settling in, he looked inside his wallet to find that he still had some money left over. He was hoping that this place had a bank so that he could convert is dollars into yen. Ben sighed a she looked up to the ceiling.

"They seem nice enough, but I am really curious about Nyu..or whatever her real name is. I am also very curious about those things on her head, are they accessories? Or are they real horns? Only time will tell." He said as he looked up. "When everyone is asleep tonight, I'll possibly use the Omnitrix to scan her, just to see." He said, he wasn't doing this out of spite or malice, he was curious, and he felt it in his instinct since he is a superhero after all. His stomach then grumbled and he groaned as he rubbed it. Oh, what he wouldn't give for some chili fries and a smoothie right aobut now.

At that point, Yuka opened the door, with Nyu close to her. "Hey Ben, we are aobut to have some rice balls, would you like one?" Ben contemplated this for a moment, but he felt like there wasn't that much for everyone so he declined.

"No thanks Yuka, I'm good." He said reassuringly.

"Are you sure? I bought enough for everyone." She said with a pleasant smile.

Ben looked surprised and smiled. "Well, I guess I will try one afterall." He said iwth a smile as Nyu suddenly grabbed his arm and lead him out to the dining room.

Ben was marveled by the lovey area and the small table. Since he was new to Japan, he was wondering where the seats were. Yuka told him that he can kneel down to the table. Something he thought was kinda strange but nonetheless he kneeled down a nice pillow. Yuka got the rice balls from her purse and gave one to everybody. Ben opened up and saw that it was rice wrapped in seaweed. Ben didn't want to eat it, but since Yka bought it, it would be rude of him not to try one.

Kouta showed Ben how to hold it and Ben did it as he was taught, he took a bite out of it and smield.

"This is pretty good, the first time I ever have eaten one." Bens aid as he kept eating hsi rice ball. Yuka then realized somehting.

"Oh that's right, hey Ben, what country are you from?" Yuka asked. Ben held up a finger and waited till he swallowed.

"Sorry aobut that, had to swallow. But I'm from America." Ben said with a smile.

"I always wanted to visit America." Yuka said. What's it like?" She asked.

Ben was nervous a little bit, he didn't think they would believe him if he said that he had to deal with aliens on a regular basis. "It's pretty ok for teh most part, there is a crime, but most of the time, it is pretty nice." Ben simply said. Yuka smiled.

"I do hope I can visit America one day." She said, with Kouta agreeing with her. Yuka saw Nyu and turned to the boys. Where do you both think she came from?" Yuka asked. "I mean what do you think she was doing there?"

Kouta was at a loss for words as Ben gave them a questioned look. "Oh that's right, we found her in the ocean standing up." Kouta explained to Ben. This prompted the boy to raise his eyebrow.

"Huh?" He asked, but then noticed that Nyu was eating the rice ball sloppily, which also didn't go unnoticed by Kouta.

"You never had rice balls?" Kouta asked as he was getting teh pieces of rice off the table. "You hold them like this see?" He said as he was showing the girl how to hold it. Ben grabbed another and opened it and took her hand.

"Just like what Kouta is showing you." Ben said as he adjusted Nyu's fingers to show her how to hold it. Nyu looked at her and to see teh rice ball and opened her mouth, and looked at Ben and Kouta with pleading eyes.

"*sigh* you're hopeless." Kouta said as Nyu took another big bite from her rice ball, and she squealed in delight. Ben and Kouta saw teh littel rice balls stuck to her cheek and they both rubbed them off, causing Nyu to smile brightly, causing Kouta and Ben to smile at her childish antics. Yuka simply impatiently looked away as she was tapping the table, and it didn't go unnoticed by Ben.

"Oh boy..." Ben said as he knew what that face meant.

Diclonious Institue

A man was watching several men in Special Force uniforms load into a helicopter. He was a young man who had dark hair, wore a blue suit jacket over a yellow button shirt, with a purple tie. This was Chief Kurama, the General Director of this institute, it is the goal of this institute that they study the Diclonius, a race of newly evolved humans with deadly telekinetic powers. He turned to see one of the men laughing to himself.

"And what do you find funny Bando?" Kurama asked the man, who smirked at him.

"I am going to have fun on this mission, I get to kill this Diclonius on sight, this will be fun." Bando said while chuckling some more, he didn't notice that a timid woman was coming up to him.

"Mr. Band-"

PUNCH

Bando punched the girl har din the face, that she was sent tumbling back. Kurama saw this and sighed and shook his head with displeasure. Bando looked down at the woman and sneered.

"You should never sneak on me like that, you stupid bitch." He said. He then walked onto the ship and Kurama went over tot eh woman and helped her up.

"I hate his attitude, but he is the only one who can kill Lucy." Kurama thought

Maple Inn

It was now night time and it was raining outside. Kouta and Nyu were both in the dining room as Kouta was looking through his bag, with Nyu watching with curiosity. Yuka came in with a broom.

"Hey, I just gave the place a quick one." She said. At that moment Ben walked out wiping his hands.

"Just got done with the dishes." Ben said.

"Oh, thanks." Kouta said as he was still going through his bag. Yuka took notice of Bens watched and was in awe.

"Hey, Ben? What kind of watch is that?"

Ben immediately froze on sight. Oh No! She saw the Omnitrix, what was he going to do? As he was trying to figure out what to say, Kouta looked up and wanted to know as well, Nyu saw the watch and was walking and trying to touch it, that is when Ben saw and backed away.

"It's nothing special, just something I got from a friend of mine." Ben said lying, Nyu saw the watch again and tried to touch it but Ben told her no. "Sorry Nyu, but you can't touch it." Ben said sternly. Nyu looked confused as Ben sighed.

"Well, it looks cool." Kouta said as he was going through his bag. Yuka looekd over at Nyu with some worry and whispered some stuff to Kouta, Ben couldn't make it out but he saw Nyu going through Koutas bag, as he was about to tell her to stop, a box came out of it, and the lid fell off, inside was a pink seashell. Kouta niced this and picke dit up to look at it.

"Wow, it looks pretty." Ben said. Yuka looked at Kouta sadly.

"Was this...from the last time you went to the beach?" Yuka asked. Kouta nodded his head.

"It wasn't long after that...when she got sick and died." Yuka and Ben both gasped at this.

"Oh...I'm sorry for your loss Kouta." Ben said while patting the fellow teenager on the shoulder.

"You said she was sick?" Yuka asked curiously.

"Yes, this seashell...it's been like a memento of my sister, and since I have come back here...it made sense...that I bring it with me." Kouta simply said.

Ben looked at him sadly, he lost his sister and he has a memento of her. It was sweet of him, Ben saw Nyu look at the seashell and took it. "She acts like a toddler...I am still wondering what could have happened to her that is making her act like this." He thought, he then saw Nyu break Koutas shell in half, and she was smiling about it. "Not good."

Kouta then became really pissed and roughly grabbed Nyu by the collar of her shirt.

"WHAT THE HELL ARE YOU DOING!?" He yelled, frightening the girl and causing Yuka to jump in and hold him back. Ben immediately ran over to sperate them as Nyu was hiding behind him fearfully. "I JUST SAID THIS WAS A MEMENTO OF MY SISTER!"

"CALM DOWN DUDE, YOU'RE SCARING HER!" Ben yelled as Nyu was digging her head deeper into Bens back, causing him to turn and see the scared look on her face.

"KOUTA CALM DOWN!" Yuka tried to tell him but he wouldn't listen.

"JUST GO!" Yuka and Ben both went wide-eyed at what Kouta said. "YOU HEARD ME! JUST GO!" Nyu's eyes immediately began to put tears and she let go of Ben and jumped over the table, Ben immediately began to give chase.

"Nyu, wait!" Ben said as he tried to grab her hand, but she simply pushed him away and ran out the door whimpering. Ben sighed and leaned his back against the wall."What the hell just happened?" He asked himself as he rubbed his face in irritation. Sure Nyu broke the seashell, but he remembered that she was acting like a little id, so she just didn't know better. Ben immediately got up and was about to scold Kouta. As soon as he got back to the dining room, he saw Kouta sitting down and muttering under his breath and Yuka looked down sadly.

"I think...she understood that the seashell made you upset." Yuka said. Kouta looked up at her with a questionable glare. "Wherever Kanae is, she wouldn't want to see you like this Kouta." Yuka said. Kouta's glare turned into a soft look as he looekd at the broken shell.

"And besides, you have to remember." Ben said. "She acts like a kid, I don't know why, but something must have happened to her that is causing her to act like this." Ben said sternly. He then got his green jacket. "I am going to go out and find her, I am not leaving her out in the freezing cold."

"I'll come with you." Yuka said.

"No, it might be quicker if we went separately Yuka." Ben said as he then exited the kitchen. Yuka turned back to see Kouta, who was still looking down at the seashell.

"What have I done?" Kouta thought to himself.

When Ben got outside, he made sure he wasn't followed and activated the Omnitrix.

"Ok, let's see here..." He said as he was scrolling through the selections. He then thought he picked out the perfect one for the job, he pushed on the dial and a green light flashed. when the flash faded, standing in Bens place was a red, humanoid, manta ray-like alien with yellow-colored horns coming from his nose, he had gills under his arms, yellow patagia, two black stripes that resembled lightning bolts coming from his shoulders right to the Omnitrix symbol that was on his chest.

"JETRAY!" The humanoid yelled out and he took to the skies. He was flying all over the area looking or Nyu. "Shouldn't be too hard to find." Jetray said. "Just look for a girl with pink hair, and cat ears." He simply said as he looked all around. He then finally spotted her at the beach nearby, he landed far away from her and pressed on the Omnitrix dial, turning him back into Ben. He ran and called out to her.

"NYU!" Ben yelled. Nyu turned around and smiled brightly when she saw Ben. She ran over and gave him a big hug. "Are you ok?" Ben asked concerningly, he noticed some tears still going down her face, and he wiped them away with his thumb. "C'mon, let's go back to the house." He said, but Nyu shook her head as if to say no and Ben was confused as she was digging through the sand.

Ben was looking at her with a confused look. Just what was she trying to dig up? He crouched down and saw what she had, a pink seashell and it looked like the one that she broke. He smiled at her. "I see, you want to make it up to Kouta for breaking it?" Nyu looked at him and smiled as she nodded her head, Ben smiled as he patted her shoulder. "That is very nice of you to do Nyu." He said, Nyu smiled brightly and hugged him again. She then let go and looked ahead.

"Huh?" Ben said as he looked to what she was looking at, and he narrowed his eyes.

Well, that is it, people. Man, that was a lot fo word I typed haha, so I do hope you all liked it so far and I hope I kept Bens personality the same. First time I am doing a Fanfic story with Ben 10 involved so bear with me people, I have only seen the original series and saw a little bit of Alien Force and seen clips of Ultimat Alien, but been doing homework on it. So anyway for the shipping. That won't happen till a littel bit later, I do plan on Ben liking Lucy/Nyu/Kaede at some point, but for now, it is limiting it to blushes and making it only a small crush. Now don't forget to read and review, I am always happy to hear from you guys and happy to answer any questions you might have for me. See you all next time :)