Welcome to my best crossover that isn't Supergirl X Flash related. This is a Supergirl and Kamen Rider crossover and the rider I've selected Kamen Rider Cross-Z from the series Kamen Rider Build.

Now summary time: Kara meets a stranger in Noonan's and the two start talking, she finds out his name is Ryuga Banjou and he's recently moved to National from Japan for a fresh start. The two start to get along but it seems Ryuga is hiding a few things, will Kara find out herself or will someone else tell her? Based after 3x14.

Hope you enjoy.

Noonan's:

Kara was in the restaurant eating a bun with her sister Alex as they wanted to spend some sister and sister time before heading off to work. They were eating chocolate chip muffins when Kara noticed a guy standing by the bar and waiting for something, something inside Kara clicked as she kept on looking at him.

"See something you like?" Alex asked and Kara blushed, Alex looked in the same direction as Kara and she too noticed the same guy as he picked up a takeaway cup and a small box of donuts. "Why don't you talk to him?" Alex suggested which almost made Kara split out her drink.

"Are you serious?" Kara asked as she placed her cup down and looked back at the guy, she checked out his dress sense; black skinny jean, blue running trainers, a red and black checked shirt wrapped around his waist and a white t-shirt which the words "I can't lose!" on it. "Look at him, a guy like that probably already has someone." Kara told her sister and with that, picked up her coat and handbag as she was going to late to .

"See you tonight for movie night?" Alex asked and Kara nodded, the sisters hugged then parted ways but what Kara didn't know was that she would be seeing that guy sooner than she thought.

:

Kara had arrived at work and was about to head over to her desk when she saw the same guy sat in James' office, he looked like to be as if he was waiting for an interview. Kara decided to walk over and see if the visitor wanted anything, she walked over and the visitor sat back and looked at the ceiling.

"Excuse me, would you like me to get anything?" Kara asked, the guest looked at Kara and gave her a smile which made Kara blush.

"You could keep me company, I don't really know here." The guest told Kara and so, Kara sat down next to him and they started talking. "I never got your name, may I ask what is it?" Kara smiled as he moved her glasses up her nose as they had started slide down.

"I'm Kara, Kara Danvers and what's your name?" Kara asked, the guy looked down then he looked back up at Kara. "If it's something funny or unusual, I promise you I won't laugh or wind you up." Kara promised as she used her hand to draw a cross across her chest.

"I'm Ryuga, Ryuga Banjou but my friends back used to call me Banjou," Ryuga told Kara and she smiled. "I was thinking about changing my name so people don't make fun of me." He told Kara and straight away, Kara shook her head in disagreement.

"Don't, I like it," Kara told him which made Ryuga smile. "So, what can I call you?" Kara asked and Ryuga smiled.

"Either Banjou or Ryuga, it's up to you," Ryuga told Kara which made the young journalist smile. "But personally, I got used to being called Banjou." He added which made Kara's decision easier.

"Then the decision is made, I'll call you Banjou," Kara told him which made Banjou smile as now he had a new friend and she was very kind. "Look, me and some friends are having a film night at my place, would you like to come over and join us?" Kara asked, she wanted to help Banjou feel at home and welcome him to the city.

"I would love to, thank you Kara," Banjou thanked then took out a pen and a piece of paper and wrote on it, Kara looked over his shoulder and saw that he was writing down a series of numbers. "Here's my number, if you wanna meet some time." He offered and Kara accepted it.

"Thanks Banjou," Kara then gave Banjou her number. "If you stay behind after the chat with my boss, we can walk over to my place together." Kara offered and Banjou nodded, he liked that idea but then, James arrived and saw Kara and Banjou talking.

"Kara, what you doing in here?" James asked, Kara stood up and was about to explain but Banjou did the explaining for her.

"Sorry Mister Olson but Miss Danvers was keeping me company until you arrived," Banjou told James and that made the boss happy. "Thank you, Miss Danvers." The pair shook hands then Kara walked off to her desk then she watched Banjou and James chat, but now her heartbeat was beating so fast it felt like Barry Allen was punching it with his speed.

Later on:

After work and they had left, Kara and Banjou decided to walk to Kara's flat and they talked along the way. They talked about family, jobs and hobbies but when it came to loved ones, Kara could tell that was a bad topic with Banjou.

"What happened?" Kara asked, Banjou put on a brave face and smiled as he explained to Kara what happened.

"She was killed, someone had mutated her into a monster but then, it took her life and she died in my arms." Banjou explained to Kara, she hugged him to comfort and cheer him up. "So what about you? Do you have someone in your life?" Banjou asked, Kara shook her head and looked down at the ground.

"I did but now he's married," Kara told him, Banjou shook his head which confused Kara. "Is there something wrong?" Kara asked and Banjou nodded.

"I honestly thought a pretty lady like you would have a boyfriend," Banjou admitted which made Kara blush as no one had ever called her pretty. "How far are we from your place?" He asked and Kara pointed up to the top floor of a block of apartments, the pair decided to race each other to Kara's apartment.

Kara's apartment:

Kara and Banjou arrived at the front door at the same time, Kara unlocked the door and let Banjou in who looked around and checked out her place. Kara hung up her coat and handbag on the coat rack then walked into the kitchen and made a phone call to Alex to tell her that she was home and ready for film night while Banjou looked out the windows to look at the view.

"I've just told my sister that we're all set," Kara told her guest, Banjou looked around her apartment and smiled. "It's not much but it's home." Kara told Banjou who shook his head.

"My last place in Japan was the top floor of a café," Banjou told Kara who laughed a little. "I was too busy helping them that I never had time for a social life." Banjou sat down then Kara sat on the arm of the couch and placed her feet on the the pillows.

"You made a good choice moving to National City, it's never dull here." Kara told Banjou who nodded. "I'm guessing you've heard about our personal guardian hero, Supergirl?" Kara asked and Banjou nodded.

"It was the one thing everyone here everyone talks about," Banjou said as he smiled and looked at Kara. "We had a hero where I was, he called himself Kamen Rider Cross-Z," That news interested Kara so she decided to look this Cross-Z on her laptop and straight away, she'd found a video clip fighting some red armored person with spider legs on the shoulders. "That's Killbus, he wanted to turn the world into a desert world to leave but he stopped him with help from an unlikely ally." Banjou explained to Kara who was fascinated about this Cross-Z person.

"Do you know the name of this ally he fought alongside?" Kara asked and Banjou nodded, he wrote the name down on Kara's notepad.

"He called himself Evolt, he always called Cross-Z his partner or buddy even though I think they didn't really get on," Banjou explained more to Kara and she was writing it down because she was interested to know more and knew just the place to get more information.

Next day:

Supergirl was fighting some alien bank robbers and she was about to call it in when one of the robbers shot a pair of gravity cuffs and held Supergirl down, they were about to make their getaway when everyone heard a loud noise and a blue light on the roof of the bank.

"Wake Up Burning! Get Cross-Z Dragon! Yeah!" Shortly later, a blue and black figure landed behind the robbers and now Supergirl was looking at what Banjou described to her; Kamen Rider Cross-Z was in National City. Cross-Z was black and blue with yellow flames on the chest and shoulder pads, white fangs on the arms, shoulder pads and the black and mirrored blue dragon heads on the helmet with a gold dragon head in the centre of the helmet.

"So, you like to beat up heroes?" Cross-Z asked, he kicked one robber who flew and landed inside a DEO van. "Why don't you two join him?" Cross-Z asked sarcastically then he punched the last two into the same van, Cross-Z then ran over to Supergirl and tore the cuffs as if they were paper.

"Thanks for the assist," Supergirl said as Cross-Z helped her up. "I've heard of you, you're Kamen Rider Cross-Z, right?" Supergirl asked and Cross-Z nodded.

"You are, I was in the neighbourhood and I thought you could use a hand," Cross-Z explained then he remembered something. "I wish I could stay and chat but I got to run. See you around, Supers." And with that, Cross-Z jumped over Supergirl and disappeared but odd thing was that Supergirl couldn't find him with her x-ray vision so Supergirl decided to take off and get to her human job as Kara.

And that's chapter 1 done and I hope you like it as this is just to see what people think of it. I'm not changing any words from the Kamen Rider unless I have to.

See you all next time!