For those who noticed why I deleted the other two? It's because this collection fic will be the place where I post the prompts I made so far.

Note this will be crossposted in Ao3 so it might take some time to prepare.

Anyway, let's stop talking and enjoy the collection.

Heroes come in all shapes and sizes. Some Double up, and some swing alone, but no matter where they find themselves, they'll always be true to their duty.

What would happen when they meet a certain resident team of valkyries?

—-

On a peaceful day in Japan, Peter wandered around the streets helping anyone along the way, luckily for him, he learned Japanese a couple of months ago so he had no problem communicating with other Japanese people.

After helping an old lady crossing the street, he was about to leave the area when his Spider-Sense was tingling, he turned his head to the source of the danger and spotted a short black-haired girl walking in the pedestrian lane when a truck was speeding up nearby.

Peter quickly rushed to the girl and when he got close to her, he pulled her away from the truck's direction, nearly avoiding getting run over.

"Hey, are you okay?" Peter asked in Japanese.

"Y-yeah, I'm fine…" The girl replied.

"Watch the road next time." He advises the girl and lets go of her "Anyway, I'll be leaving now, I have other things to do."

"W-Wait-"

Peter quickly left the scene before the girl could talk to him more, she just hoped this won't be the last time they met each other.

—-

"Excuse me, miss. Have you seen this lost cat?"

A man in what could only be described as a detective held up a photo of a cat. He was quite handsome, and had a sharp fedora.

"No. My apologies." The woman said, before walking away.

"Man, another dead end." Shotaro Hidari fixed his hat as he stared up at the sky. "This city is so different from Futo. But it still has a good wind blowing through it…"

He pulled out a phone and put it to his ear. "Hey Philip. Anything new?"

"Nothing yet, Shotaro." His partner said. "I can access the Gaia Library here, but all the info we need is cut off."

"Well, keep working at it." Shotaro said. "I'm eager to get back home."

"But learning about this new world is thrilling." Philip said. "I wonder what knowledge we can take back."

"You're always like this." Shotaro sighed, as the call ended. He looked at the cat photo again.

"Ah well, time to get back on track. Got to find that kitten. Maybe if I act like a cat…?"

—-

Although there is less crime rate in Japan, Peter never let his guard down and always prepared his Spider-Man costume hidden inside his casual clothes just in case something happens. Not even this country is safe from any special threats.

He kept wandering around the streets until his Spider-Sense tingled again, he quickly dodged an oncoming car by rolling down to his left side.

Peter fixed himself up and shifted his eyes to the person responsible for the mess, when he saw it, his eyes widened in shock. The one who threw the car at Peter wasn't a human, but rather than the…

Noise, alien beings who wreak havoc almost anytime without a warning, no ordinary human can handle this all by themselves and worse, they can get killed if they get in contact with them.

Not wanting to see people dying at their hands, Peter rushes to the area where the chaos started, and while he doesn't have the equipment to fight them, he plans to evacuate the people instead.

He quietly wishes there are no casualties this time.

—-

"Philip, are you seeing this?" Shotaro had called his partner again.

"I'm looking at the news report, yes."

The Noise were wreaking havoc through the streets. When they had come to this world, they had realized just how dangerous these creatures were. Philip tried looking it up, but the info he needed was cut off.

"First things first." Shotaro said. "We'd better evacuate the people here."

"Good call." Philip responded.

Shotaro placed an odd device on his waist.

"Let's go, Partner."

Elsewhere, in their place of residence, a similar device formed on Philip's waist. He held up a green USB-like object and pressed the button.

[CYCLONE!]

Shotaro held up a black one and pressed the button as well.

[JOKER!]

"Henshin!"

—-

Peter just finished changing into his Spider-Man costume, then he immediately leaves the alleyway and tries fighting them back, but he remains cautious.

He saw a group of Noise approaching him, but Spider-Man jumped in the air and shot his web at a manhole cover, he pulled it out and used it as his only weapon.

Spider-Man carefully defeats the Noise one by one using the manhole cover while maintaining his distance between them, he then finishes it off by spinning his web attached to the cover, wiping all the remaining Noise who tried to attack him.

Just as he was about to leave, he spotted someone from a tall building, the victim was now surrounded by a group of Noise, and what's worse is that he knew what's gonna happen next since he experienced this scenario twice.

"No, not this again." Spider-Man mutters in his own breath before he swings his way towards the building to try and save this person for the second time.

However, it was too late as the person accidentally slipped and ended up falling down the building "NOOOOOOOOOOOO!" Spider-Man wasted no time grabbing the person and taking it to a safe spot.

But what surprised him is that the person he saved was the same girl he saved as Peter.

"Are you okay?" He asked. "I'm fine, thanks for saving me." The girl thanked him "Who are you anyway?"

"I'm Spider-Man, you?"

"Miku Kohinata."

Spider-Man fixed her clothes "Listen Miku, you better get out of here before things will get worse." He gave her a warning "Now go, I will take care of this."

"Y-Yes! Be careful Spider-Man." Miku listened to his words and quickly left the chaos, now there are no civilians in danger, Spider-Man continued to fight the Noise.

—-

"Now, count up your sins!"

A masked figure in armor punched and kicked apart the Noise. Half of his armor was green, while half of it was black. Split down the middle to make two sides of the suit. The attacks generated some sort of purple energy, as well as powerful green bursts of wind. Whenever one of the monsters were about to reach a citizen, the masked hero was there to protect them.

"Hurry, get out of here!" The black half shouted, before turning to the Noise again. "Philip, can you get an analysis on these guys?"

"Already did so." The green half answered. "These are the Noise. Man-made alien-like creatures that are capable of carbonizing normal people on touch. However, these ones seem to be slightly different since they don't have that feature and can be destroyed by simple firearms."

"So we can handle them with no problem." Shotaro said, as he punched apart another one.

"On our left." Philip said.

"Huh?" Shotaro asked.

The masked figure turned to see a huge explosion in the distance.

"That's where we should go." Philip said.

"Go to the big explosion. Smart call." Shotaro agreed. "We'll probably get more answers there."

The masked figure snapped his fingers, as a massive truck rode onto the scene. He hopped into the vehicle and drove towards the explosion.

—-

Spider-Man meanwhile, observes the masked figure driving in his truck "Looks like I'm not alone here." He mutters before he skydives from the building and swings his way to the explosion.

This day gets weirder since his first experience of being in another universe.

—-

"Hah!" Hibiki smashed her fist into the Noise, obliterating it in one shot. She took a few steps back, looking around at all the Noise surrounding her.

She had to hold out as long as she could, before backup could arrive. She could handle herself mostly fine, but there were a lot of them, and trying to control the numbers of a large group like this wouldn't be easy.

Just before she was about to attack once more, she heard the revving of an engine. She thought it was Tsubasa for a moment, but then saw the huge truck mowing down a good chunk of the Noise. It pulled to a halt next to Hibiki, and out jumped a masked hero. He landed next to Hibiki, his silver scarf flowing in the wind.

"Huh?" The masked hero turned to look at Hibiki. "What's a cosplayer doing here?"

"I uh, can say the same to you." Hibiki said.

"Careful, Shotaro." Said the green half. "Looks can be deceiving. I think I read on her before…"

"Who are you?" Hibiki asked.

"Us? We're the two-in-one Kamen Rider!" Both of the voices said, holding up a hand. "Kamen Rider Double!"

"Kamen Rider Double?" Hibiki asked.

"We're here to help out." The black half said.

"You seem pretty strong, so watch our backs, okay?" The green half said, as he turned to face the Noise.

"Um… okay." Hibiki said, turning back to the Noise. "Weird, but I think I can trust them-"

"Alright! Let's-! Huh?"

Double looked around to see Hibiki was gone.

"Eh? Where did she go?"

—-

Spider-Man, who just arrived at the site, shoots his web at Hibiki's arm and yanked her in time to avoid her from getting attacked by the Noise. He turned his head behind and saw Chris boarding a missile "CAN YOU HOP OFF THE MISSILE MAAM?" He asked loudly

"WHAT ARE YOU GOING TO DO WITH THAT?!" Chris shouted in question "JUST DO IT!" he shouted back "OK, FINE!" Chris had no choice but to hop off from her missile, Spider-Man took this opportunity by shooting his web at the missile and pulling it towards the group of Noise.

When it made contact with the ground, all the Noise that was near the missile were now caught in the explosion, causing them to obliterate and create a large crater in the process.

"Does the government pay for collateral damages?" He asked, "That depends." Chris landed on the ground and aimed her revolver at both masked heroes "Now who the hell are you?"

—-

"Whoa, easy on the trigger there." Double said, holding up his hand.

"I don't know if she'll listen to reason. Also, we don't know who this other masked guy is." Philip said.

"Oh yeah, that's true." Shotaro said, turning to the red hero. "Who are you?"

"Me? Uh… I'm Spider-Man." Spider-Man said.

"Why did you pull me away?" Hibiki asked, as she landed next to Chris.

"Oh, I thought you were a civilian." Spider-Man said.

"She was holding herself quite well." Shotaro said. "Maybe check before you do that."

"Fair enough. Who are you, by the way?" Spider-Man asked.

"Us? We told that girl already, but we're the two-in-one Kamen Rider. Kamen Rider Double."

"We?"

"Oh yeah, we didn't mention that, right." Philip said. "I finished my lookup on him though."

"A lookup?" Spider-Man said.

"Okay… one half of the guy is talking." Chris said, lowering her gun. "Creepy…"

"What are you two doing here?" Hibiki asked. "We've never seen you guys before."

"Well… it's quite simple." Philip said. "The three of us… have no way home."

Here is my very first r/Symphogear Discord Monthly Prompt in March, for those who were on the server will know that there is a collaboration event. And also my first ever prompt to make since I joined this server.

Shoutout to EpicLinkSam for collaborating with me and hope you guys have enjoyed this prompt.

There is more to come out so look forward to it.