Infinite Universes, Infinite Worlds. There are many tales that had been told, and others that shall be tell. In some stories, an individual may meet another individual from another story, different from their own. It may intertwine, combining their stories into one. They may share the same world, another time and place it may be, but each of them share the same sky. Some of these individuals may meet each other whenever a crisis so severe, a force far stronger than they have ever faced, brought them together. No matter where or when they are. This tale is one of many crisis that force these individuals to unite against a terrible threat...And it began, when He Who Destroys Worlds visited a world unlike any other.

Prologue: A New Connection

Location: Hikari Photography Studio

Photography is a wonderful invention, it captures certain moments in life that will be forever remembered using a camera. Anyone can do that, anyone except a certain young man with a pink camera slung around his body.

This man is your typical Japanese brunette pretty boy, wearing a black turncoat jacket over a dark magenta sweat shirt, he also wore black pants and shoes. The man was sitting on a sofa, fiddling with his camera, a dark pink Twin Lens Reflex camera to be exact. He contemplates the fact his photography skill is similar to a cyclist whose bike brakes broke resulting in him crashing into a manure truck; terrible. Whatever picture he took always result in said picture to be extremely blurry.

"Still complaining about your bad pictures, Tsukasa? I thought you replaced that junk with a new one." said another young man drinking a cup of coffee. He has black flowing short hair, wore a ocher leather over a black T-shirt, a pair of dark blue jeans and sneakers. "If you want, I have a few cameras that might interest you."

Tsukasa Kadoya replied, "This thing is no junk, Kaito. And no matter what, I won't replace this camera.", he put the camera on the table and walked towards the man named Daiki Kaito, "Besides, don't you have better things to do than stealing, planning to steal things and freeloading?"

Daiki scoffed at Tsukasa's attempt to insult him, "And here I thought we're finally friends. Just because I'm a bit of a kleptomaniac doesn't make me a bad person, I merely relief objects from the original possessors in order to make better use for them." "By better use, you mean a trophy, right? You're still the same thieving jerk the first time we met." Tsukasa deadpanned. "At least I can eat sea cucumber and not choke on it like it was a bundle of natto beans." Daiki retorted. "Although natto beans are horrible." Tsukasa always hated sea cucumber, but having almost no memories of his own past annoyed him, and it annoyed him even more so when a person like him did it in a cheerful manner.

Then, a girl in white entered the room, her frilly dress made her looked like a princess, even though her attitude is anything but princess-like. Her long black hair rested behind her back as she put her two thumbs up, she then thrust each of her thumbs into both of their necks, hitting a certain pressure point. Both men began to flinch and laughed uncontrollably. "Seriously you two, this arguing thing of yours is getting old."

"Urk... Natsumikan! For crying out loud, stopdoing that, it's humiliating!" yelled Tsukasa as he struggled to his feet. Natsumi Hikari and her grandfather, Eijiro, owned the studio the two men currently reside in. "Well, maybe I'll stop if you stop being such a moron and getting out of line, Tsukasa-kun." said the girl, closing the door behind her. As both men stood up, she walked to the kitchen in the room next to them.

"It seems obvious who's wearing the pants in this relationship." Daiki snickered as he sat back down. Ever since Natsumi became a Kamen Rider thanks to a little white female Kivat-bat, assisting Tsukasa in saving the multiverse, he noticed that both of them started to have feelings for each other. Of course, being a self-righteous twit and a tsundere-ish girl made it difficult for the two to acknowledge each others true feelings. "Shut up, Kaito."

Two years ago, Tsukasa ventured the A.R. Worlds, alternate realities where different versions of Kamen Riders before him existed, and at one world, a team of heroes adorned in colorful suits called Samurai Sentai Shinkenger. He wonders if there are other worlds that doesn't have a Kamen Rider, if so, Tsukasa would probably be blamed again for whatever problem that occurred. He had enough of "Damn you, Decade!" and "It's all Decade's fault!" to last him for a lifetime. Come to think of it, thought Tsukasa, the man who uttered those very words haven't been since since his battle against Super Shocker. (why do many evil organizations tend to have clichéd names anyway?)

"You guys ever wondered what happened to Narutaki?" ask Tsukasa to his housemates. Narutaki was the man responsible for Tsukasa's predicament in his adventures. Spreading nonsense about him going to destroy the worlds. That part almost came true but fortunately, it was prevented. "Well, last time I saw him, he joined forces with Super Shocker and became Colonel Zol." said Natsumi as she exit the kitchen with a cup of coffee, "After that grasshopper monster shows up, he accused you to be the cause of an even greater crisis. Then he was nowhere to be seen." as she sat to drink her coffee, Daiki gave out his answer gleefully, "Well, wherever he is now, I'm sure he's plotting his revenge as usual. If the Evil Overlord Guide I got is right, we'll meet him one day and we'll have more fun kicking ass." Tsukasa facepalmed to his answer, "I question what kind of things you consider fun, sometimes..."

Then, an old man entered the room, followed by another young man. "Tadaima~", said the two men. Natsumi was the first to answer, "Ojiichan, Yuusuke-kun, okaerinasai. How's your trip?" Yuusuke answered as he went to the kitchen to put the groceries into the fridge, "It was awesome! There was this huge mall we went into and it had everything. I was tempted to buy some souvenirs, but the prices are too high for us..." The man smiled sheepishly as he scratched the back of his head, even though it didn't itch. Yuusuke wore a blue vest over a black shirt with a golden symbol that resembled a mask, a pair of jeans and white sneakers.

Eijiro wore a cardigan ensemble and a a bowtie. It's amazing that a man this old could still have a medium-length flowing white hair. He then replied to his granddaughter, "Well, Natsumi-chan, we were also able to visit a lovely tea house, owned by a Haruka Urashima. She's a pleasant company, despite her constant smoking habit. Apparently, her nephew... or was it cousin? Anyway, she said that her nephew owned the inn next to the tea house, and they have room for sale, and a hot spring. The residents are mostly girls, though, And Yuusuke here got into trouble from one of the residents." the old man chuckled as the memories of said incident still lingers in his memories.

"Jii-san, I told her that it was an accident! I was searching for a toilet when I bumped into her in a towel, that redhead suddenly went berserk and chased me around." Yuusuke tried to defend himself, but the other men chuckled at the image of Yuusuke Onodera, aka Kamen Rider Kuuga, running away from a half naked girl. They would tease him for a long time.

But since everyone has gathered, Tsukasa rose from his chair and walked towards a part of the room with multiple backdrops, he used them to travel the A.R. Worlds with the entire studio as the transportation, he still doesn't know how in blue blazes does it works like that, but he decided a long time ago not to worry about it.

"Well guys, since we're done here, let's go someplace else."

He then pulled the chain that control the backdrops, sometimes it shows random pictures that relates to a certain individual or event that gives them a clue to what kind of world they would visit next. It felt like a lottery show where the host shows the audience what the lucky digits are.

The backdrop then suddenly stopped, revealing the planet Earth, in front of it are three heads floating in front of it; on top was a green haired woman, for some reason she has a pair of bat wings behind her head. "Wow, she's pretty." Was all that Yuusuke could say. True, her emerald eyes looked dazzling to a man, her smooth lips alluring as she seduces a man to 'play' with her. Natsumi slapped Yuusuke to his senses before he started drooling. On the left, was a Japanese man, he wore a red headband and the white cloth below him indicates that he wore a karate gi. "He looks like a hobo to me. Nothing fascinating." Said Daiki as he adjusted his seating. "Better watch what you say, Kaito." said Tsukasa, "That 'hobo' remark may bite you in the ass one day."

When they looked upon the head below the other two, Yuusuke instantly recognize him, "Oh my God, it's Rockman!" The others stared at him for a few seconds, "Come on guys, don't you play video games when you were kids? It's Rockman, made by Capcom for the SNES! Come to think of it, now I know who those other two are; it's Ryu from Street Fighter and Morrigan from Night Warriors!" Yuusuke was practically geeking out that the fact the next world will involve his favorite video game characters.

Tsukasa just stood there, with his mouth agape, not believing what he's about to face. He regained his composure in seconds, "Okay, I can understand a world without any Kamen Riders, but... video game characters, really?" Kaito smiled at Tsukasa's amazement, he always savor the moment whenever he was like that. "Well, if you don't mind, I'll go ahead and scout the place," Kaito then walked out of the room, leaving the four behind to their own, "and maybe I'll find some treasures while I'm at it."

As soon as Kaito left the building, the backdrop suddenly sparked, then it shone brightly, blinding the others. As the light fade out, the picture has now changed.

Earth was still on the background, but this time, it's stood between a large group of people. On the left was Ryu, with Morrigan and Rockman at his sides. Behind them are many other characters from Capcom. One was a ninja-like warrior, with a unique looking laser blade. Close to him was a man with dreadlocks with a mechanical arm. Below him a soldier, a pistol in hand aiming in front of him. There's also a catgirl with blue hair so large they thought she used too many hairspray. Said catgirl was riding on top of a large muscular mustached man, he was topless, only a body strap surrounding his body, he was holding a pipe. And there were many others behind them. Above them all, were three humans and a gargoyle. One man was a blond in black, sporting shades, but couldn't hide one of his glowing red eyes. The other man was facing away from them, his back has a red glowing 天. The red gargoyle, with its wings spread, looked on menacingly. Above them all was a man in red who looked like a dictator. He glows in a menacing purple aura.

On the right side, were Tsukasa's fellow Kamen Riders. Leading the group was the first Kamen Rider, Ichigo. His red scarf blowing away from him. Next to him was the tenth Rider, ZX and Decade, Tsukasa himself. But for some reason ZX looks slimmer and had a sword attached to his back. Behind them were three Riders he recognized as his successors. The middle one was Double, the half green, half black Two-in-One Kamen Rider. Above him was OOO, pronounced Ōzu if not mistaken, the Rider destined to become the Multi-King and rule the world. Below him was the newest and youngest Rider (Not counting the alternate versions of Kiva and Hibiki), Fourze. His rocket shaped head still makes it weird to him. Tsukasa noticed that these three lived in the same world. Behind them were many others, such as Amazon, Stronger, BLACK RX, Kuuga, Kabuto and many others, including all of the Secondary Riders. Above them were three villains he recognize very well. One was the silver armored Shadow Moon, an evil Rider, stepbrother of RX who has his own agenda. He wields his famed Satan Saber, a red bladed sword with golden guards, hilt and pommel. The blade was larger than usual. Next to him was Apollo Geist, one of many commanders of the Shocker he fought. He still wields the sword and shied getup, with a red and silver helmet. Tsukasa hasn't forgotten for what he did to Natsumi. The last one was none other than Narutaki. Still wearing that crummy hat and smug face. "Looks like Kaito was on the money, he is back."

There was another figure above them, what and who he was shocked everyone in the room.

"N-no way!"

"I don't believe it!"

"Is this... an illusion?"

Tsukasa stood there in silence, gripping his fists tighter.

It was another Kamen Rider Decade.