I don't own Kamen Rider Kuuga or the Quintessential Quintuplets, those belong to their creators. This is for fun, not profit.

Kuuga and the Quintessential Quintuplets

In Asahiyama High School the students were in the cafeteria hanging out with their friends and eating lunch together.

One student was a teenage young man with black hair styled in a bowl cut with two strands sticking up from the back of his head with the bangs covering his forehead. He also had black eyes. He also had a stern look on his face.

He was wearing the typical uniform of Asahiyama High School, which consists of a short-sleeved white shirt tucked in long dark blue trousers, and a white belt.

This is Uesugi Futaro.

He was standing in front of the lunch lady as he requested his usual in the cafeteria.

"One barbecue beef bowl. Hold the barbecue." Futaro told the lunch lady.

"Sure thing."

With that Futaro was carrying a tray of his lunch, one bowl with rice along with miso soap and pickled veggie.

'You'd think the cheapest item on this cafeteria's menu would be rice, but no. Subtract 200 yen for the beef from the barbecue beef combo, and you get rice plus miso soup and pickled veggie for the price of rice. You get free, unlimited water, too. School cafeteria for the win.' Futaro thought as he walked to his usual table.

As he was walking some of the students were talking about Futaro but in a somewhat mocking tone.

"Usegi-kun's on his own again." A female student said as she chuckled.

"Oh, man." Said a male student.

Futaro was able to hear that but didn't mind their words as he just smiled.

"But still, it's wonder how a hot guy like Godai-kun can become friends with a loser like him." Said another female student.

Futaro flinches to hear that though.

Futaro soon arrived at his table and placed his tray on it, but at the same time another student did the same.

Futaro turned to that student and saw it was a girl.

The girl was around his age with medium-length hair and an expressive ahoge. She has reddish-orange hair colour with a pair of star-shaped hairpins near both of her eyes. She has dark blue eyes, an average height, and a well-endowed figure.

She was also wearing a different school uniform from the other female students.

"What are you doing?" Futaro asked.

"I should be asking you that. I got here first. The next table is available. Move, please." The girl told him.

"This is where I sit every day. Now would you please go. I would rather not have another annoyance here." Futaro told her before he heard a familiar voice.

"Yo, Futaro!" Said a man standing behind Futaro with a smile and cheery voice.

Futaro flinches when he hears and recognizes it.

"And speak of the devil." Futaro grumbles as he turns to the man behind him.

It was a teenage young man wearing the same uniform as Futaro. His white shirt was completely unbuttoned as he was wearing a red T-shirt underneath it. For his hairstyle, the sides of it was a buzz cut while the top had a large mohawk that was colored blonde as the sides were black. He also had a few ear piercings on his ears, and has sky blue eyes.

This is Godai Yusuke. Futaro's best and probably his only friend in school.

"Let's have lunch together!" Yusuke said before he notices the girl standing next to Futaro.

"By the way, who is this girl and why is she…" Yusuke said as soon saw that their lunches were on the table. "Oh I see now. So you made a girlfriend today."

Both Futaro and the girl blushed to hear that.

"She's not my girlfriend!/I'm not his girlfriend!" They both said at the same time.

Yusuke blinks in confusion.

"Then why are you sharing a table together? Isn't that what a couple usually do?" Yusuke asked.

"It's not like that!" Futaro and the girl said at the same time once again as they eyed each other.

Yusuke just smiles as he hugs onto Futaro's neck.

"Now come on, best friend, you can't keep secrets from me. Oh right, I should probably get to know her." Yusuke says as he let's go of Futaro and grabs hold of the girl's hand. "Pleased to meet you, best friend's girlfriend, what's your name?"

"I told you, I'm not his girlfriend...But I'm Nakano Itsuki." Itsuki introduced herself.

"Itsuki-chan. That's a pretty name. Also please be sure to get along with Futaro, he can be a bit shy at times but he's a great guy." Yusuke said.

"I can't keep telling you, it's not like that!" Futaro told him.

"So...Who are you?" Itsuka asked.

"Oh right, how rude of me." Yusuke said as he let go of her hand and pointed his thumb at himself. "My name is Godai Yusuke! The man who has mastered…"

Yusuke paused before he counted with his fingers.

"Let's see...I mastered skill number 606 in the start of this year. I mastered skill number 614 in spring. Then I mastered skill number 623 last month...Oh I remember now!" He pointed his thumb at himself again. "Once again, my name is Godai Yusuke! The man who has mastered 624 skills! But soon, I will master a thousand skills!"

There was silence between the three of them.

"Huh?" Itsuka said in confusion.

After school, Yusuke had returned home as he walked inside and headed into the main room of his house.

"I'm home, nee-san!" Yusuke calls out.

"Welcome home." Said a woman's voice.

Yusuke looked at the table and there was a woman seated on the kitchen table typing on a laptop.

She appeared to be in her mid to late 20s. She had long black hair and matching eyes, and was quite beautiful. She was wearing glasses over her eyes, and was wearing a sweater with a skirt.

This is Godai Saki, Yusuke's older sister.

"Working on your research again?" Yusuke asked as he walked to the kitchen's fridge.

"Yeah, I am." Saki said as she lightly tapped on her shoulder.

Despite her age, Saki is an accomplished archaeologist and has made quite a name for herself in the community. The pictures of her discoveries were on a shelf.

She discovered the fossil of a new type of extinct dinosaur. A treasure that belongs to Cleopatra the last queen of Egypt. And even a viking ship that contains a large treasure chest filled with gold. There were several others like them.

Now Saki was on the work of her latest and quite possibly her greatest discovery yet.

"So I'm guessing you won't be home for a while again?" Yusuke asked as he opened the fridge and brought out the milk and picked up a glass cup.

"Yeah, I'm sorry, Yusuke. But if I'm right about this, it could be the discovery of the century." Saki told him as Yusuke poured the milk into the cup.

"Don't worry, I get it. Your work is important to you. And I'm proud to have a sister like you, I really am." Yusuke told his sister before he drank his milk.

"Well I'm glad to hear. But once I'm done, how about we go on a trip, just the two of us." Saki offered.

"Really?" Yusuke asked and Saki nodded. "That sounds great."

Yusuke then walks behind her to look at her laptop to see what was on the screen.

There were several strange symbols with words on the bottom of them which is probably the translation that his sister was able to decipher.

Out of all the symbols, there was one that really got Yusuke's attention as he looked at it.

The symbol almost resembles a beetle's face with horns on the head.

"So what are those symbols?" Yusuke asked.

"Don't worry about it. I'll explain later." Saki said as she closed the laptop. "Anyway, are you hungry? I'll cook dinner."

"Sure." Yusuke said as his sister stood up and headed to the kitchen before he looked at the laptop as his mind was still interested about those symbols. "I wonder what those symbols were about."

(Days later)

After school was over, Yusuke had received a call from his sister and told him she was now back in the city and wanted to show him her latest discovery.

It was the first time Saki had invited him to show off her discoveries. Excited about it, he invited Futaro to join him along with Itsuka. Yusuke had told Futaro this would be a chance to get closer to her if he was going to be her tutor along with her four sisters, story for another time.

While reluctant Futaro and Itsuki decided to join Yusuke to meet up with his sister.

When they arrived at the building where Saki's research team were studying the artifacts they found, a police car smashed through the wall and exiting the car was a human-shaped creature.

The creature's body was colored pale-green with bronze colored armor around its neck and spider legs attached on its head, and was wearing dirty bandages around its forearms along with a loincloth with a black belt and a bronze buckle that resembles a monster's face. It also has six large and black spider eyes along with a mouth that resembles a spider. It also had claws on the tips of its fingers and on the top of his hands and had three toes with claws on them.

This is the Grongi, Xu-Gmun-Ba.

The people in the building screamed to see the monster before Yusuke noticed it was looking at a stone belt which was one of the artifacts that Saki had found.

"Si taht Kuuga's tleb?" Xu-Gmun-Ba said and they weren't able to understand him.

The stone belt gives off a bright light and as Yusuke closes his eyes he could see images flashing in his mind.

The images were of an armored warrior fighting against monsters like Xu-Gmun-Ba.

"Nee-san…" Yusuke mutters as his sister turns to him. "I-I think he's after that belt."

"What?" Saki said as she noticed that Grongi was also looking at the belt. "Wait...It can't be…"

Xu-Gmun-Ba walks to them to the stone belt as one of Saki's research team members grabs onto it.

"Saki-san! Yusuke-kun! Run!" He told them before the Grongi easily tossed him to the ground.

"Rio-kun!" Saki said in worry.

Xu-Gmun-Ba then turns his attention to the other members of Saki's team before he jumps and attacks them one at a time.

As Yusuke watches helplessly as the Grongi was attacking and hurting the people, he couldn't sit back and watch anymore.

Yusuke soon stood up and picked up the belt before he called out to Xu-Gmun-Ba.

"Hey, freakshow!"

As Xu-Gmun-Ba was holding someone on the neck, he turned to Yusuke as he showed the belt in his hand.

"You're after this right? Then come get it!" Yusuke told him as he was going to put the belt on.

"No, Yusuke! Don't do it!" Saki told him, but it was too late as Yusuke put on the belt.

The moment he did, the belt gave up a bright light as he groaned in pain as he could feel a scorching pain around his waist as the belt sheds its stone-like skin, showing its true form.

The belt was now colored silver with a large red stone on the center of it, it also had black symbols on the side and had several small symbols around the red stone. Beside the red stone were several buttons with most of them being gold while there were two pairs of different colored ones in front of them, on the right were red and blue buttons while the left had green and purple.

This is the Sonic Wave Transformation Belt Arcle.

Upon seeing the belt's transformation Xu-Gmun-Ba let's go of the human he was holding before he jumps to Yusuke and grabs onto him as they jump through a large hole that leads outside.

"Yusuke!/Godai-kun!" Saki, Futaro, and Itsuki said in worry.

Xu-Gmun-Ba had thrown Yusuke to the ground as he rolled on it.

"Itai…" Yusuke groaned.

Then Xu-Gmun-Ba grabs onto his shirt and picks him and begins beating on him starting with punching in the stomach a few times and slamming to a nearby van before the Grongi throws him to the ground.

Yusuke then notices Xu-Gmun-Ba slowly approaching him.

"Am I...going to die…?" Yusuke said in fear and worry, before he sees his sister Saki in his mind, then his Futaro, and Itsuka, and remembers watching Xu-Gmun-Ba attacking all those incident people and starts to imagine him attacking and even killing his sister and his friends.

"No...I refuse to let that happen...I am...I'm going to…!" Yusuke said as he slowly stood back up.

Xu-Gmun-Ba soon charges at Yusuke to finish him.

"I'm going to protect their smiles!" Yusuke shouted as he punched Xu-Gmun-Ba which forced him to stumble back. Then to Yusuke's shock he saw that armor had covered his arm after punching the Grongi. "My hand…"

Then on instinct, Yusuke begins to beat on Xu-Gmun-Ba by punching with his other arm, kicking his legs, and punching with his fists, and during each blow pieces of armor soon appear on each of his body parts before the next attack forced the Grongi to stumble back as he falls on his hand and knee.

Xu-Gmun-Ba looked up at Yusuke while at the same time his sister and friends had arrived and saw an armored warrior in his place.

Yusuke was now wearing a black bodysuit with white armor and the belt he was wearing. He was wearing a chest piece that simulated pectoralis with a golden metal piece around his neck, and had two shoulder pads connected to the chest armor. He was also wearing white gauntlets around his forearms with golden bangles around the wrists and the ends of the gauntlets. He was also wearing golden knee pads with white jewels and was wearing golden bangles around his ankles. Lastly his helmet was colored black with a silver mouthpiece, along with red large lenses with small golden horns that barely extended past his head.

This is Kamen Rider Kuuga - Growing Form.

Saki, Futaro, and Itsuka then notices the belt he was wearing and recognizes it as the same one that Yusuke was wearing.

"No way...Is that…?" Saki mutters.

"Yusuke?" Futaro said in awe.

"Amazing…" Itsuka said in awe.

Kuuga looked at his hands and placed them on his helmet.

"This is…" Kuuga mutters as he is stunned by this.

"Kuuga!" Xu-Gmun-Ba calls out as he stands back up as Kuuga turns to him. "Os uoy evah nrutre!"

"Not sure what you said...But if you still want to fight then bring it on!" Kuuga said as he assumed a combat stance.

Xu-Gmun-Ba roars as he charges at Kuuga as he is ready to fight him, before both Kuuga and the Grongi throw a punch at each other as the screen freezes.

And there you have it, I hope you like it. Review to tell me what you think about the story idea.

And before you ask, yes, I did base Yusuke's design from the Kuuga manga.