Disclaimer: alright, first thing first, I do not own Kamen Rider Decade (Which is my Fav Rider) and also To Aru Majutsu no Index. It's all belongs to TOEI and JSCII Media Works respectively.
A/N: Well, this is my first time doing a crossover of the two series I like, Kamen Rider Decade and To Aru Majutsu no Index. This is my first attempt so I may have some mistakes. Please bear with me.
(Another note: This take place after the Rider Wars and the defeat of Super-Shocker, Decade main antagonist's organization in the series)
Prologue: The Beginning of a New Journey
"So, after all I've done…I'm still a passing through Kamen Rider huh?" A man who's wearing a coat and a magenta shirt inside is looking at the background portrait that contains a picture of a never ending road while holding his special pink colored camera. He's Kadoya Tsukasa, famously known as Kamen Rider Decade, the destroyer of the World…or so he was before.
It was several days after the end of the Rider Wars that lead to the restoration of all Rider Worlds from being fused into one, thus destroying them and also what seemed to be the end of the evil organization that once threatened A.R. (Alternate Rider) worlds…the Super-Shocker.
"But still, you have us with you right Tsukasa-kun?" A girl said to him, she's a beautiful girl named Natsumi Hikari and the co owner of the Hikari Photo Studio which she runs together with her grandfather, Eijiro Hikari. "This studio is you world now." She said to him.
"Natsumikan" Kadoya said her with that nickname ever since his journey as Kamen Rider Decade has begun. Once thought as the "Destroyer of the Worlds" by Narutaki. He actually save the entire Rider World's by destroying all the Riders and revives them at the cost of his own life. Now, after all that happens, he's living peacefully in the Hikari Studio with Natsumi and everyone.
Tsukasa looks at Natsumi and smiled while saying, "Thank you…Natsumi" That makes Natsumi herself blushes after hearing that.
"Y-You're welcome" Natsumi said while staring at Tsukasa who's looking back at the background picture.
"Oh~ Am I seeing a lovebird between you?" A young man then interrupted them which make Natsumi snaps out.
"Oi! Yuusuke! Don't surprise me!" Natsumi scolds Yuusuke which is actually a Kamen Rider named Kuuga from the World of Kuuga who's following Tsukasa and the others; travelling the Worlds because he had made a promise to the person he cared most before, 'To keep everyone smiling' that was his promise.
"Sorry Natsumi-chan, I'm just kidding! Spare me!" Yuusuke begged her before she can hit him with her secret technique which she can induce laughter in a specific point (mostly at the neck), the famous 'Laughter Pressure Point' move.
"Alright kids! Enough playing, here have some cakes I made." An old man named Eijiro Hikari, the co owner of the Hikari Studio together with his granddaughter. Outside he was a carefree and also lovable grandfather but inside…he was the most ruthless villain who once served in the Super-Shocker named Super Professor Shinigami but lost his evil memories before.
"Thank you!" Yuusuke excited to eat Eijiro's food.
"Yuusuke, you're such a child." Tsukasa make a cold remark but with Yuusuke busy eating the cake, he ignored his comment.
"By the way, where is Daiki-kun?" Eijiro asks Tsukasa.
"I don't know, maybe gone out and travel all by himself again to find some 'treasures'…but don't worry, I have the feeling that we will meet him again." Tsukasa said as he also eats the cake.
"I'm going to make some drinks." Natsumi said while she takes her leads to make several drinks for them.
"Aww~ Yuusuke-kun, are you eating a strawberry cake?" a female voice said to Yuusuke, she's actually not a human but a female Kivat from the World of Kiva named Kivala, who's accompanying them since their first meeting in the World of Kiva and have developed a liking to Yuusuke. She's also a means for Natsumi to transform for she is also a Kamen Rider named Kamen Rider Kivala.
"No Kivala! Why don't you ask Tsukasa?" Yuusuke said as he tried to protect his cake from the bat.
"Because I like you Yuusuke~ Well, if you won't share your cake…Then let me bite you~" as Kivala said to him passionately.
Feeling chills on Yuusuke's spine, he immediately stand up and tried to go far away as possible from Kivala and in the end, the two as usual, running around while Tsukasa just watch their antics.
Natsumi just arrived with the tea when she saw Yuusuke and Kivala running and flying around respectively, which gives her a headache. "Yuusuke! Kivala! Stop running around! You're messing this place up!"
"Sorry Natsumi-chan! Kivala won't stop chasing me!" Yuusuke said to her while still running around until he hit the pole while the background picture which always came down when they are travelling through the world.
To Natsumi and Tsukasa surprise, another new background picture comes down. It shows tall buildings, several windmills and also a blimp which is pictured flying above it.
"Another world!" Natsumi surprised to see the background picture while Tsukasa just staring at it.
"Well then Natsumikan, our new journey is just about to begun" Tsukasa said as he looked at Natsumi.
Meanwhile,
Academy City, a city where the majority of them are students who had supernatural powers or ESPers which they called and also the place where science and technology developed into unprecedented heights; making them 30 years ahead of its time in terms of technological advancement in civil and also militarily.
But for a certain spiky haired boy named Kamijou Touma, this is all just normal to him; that's what he's thinking since this boy's life is filled with bad luck. Today, he's just gone back from his school through the park after attending the Brain development test which is conducted annually to measure power level of an ESPer.
"Fukou da~ Still a Level 0 huh?" Touma sighed as he looked into his ESPer's result card which still labeled him as the Level 0. Ironically, this boy have the power that can negate supernatural powers and also once defeated the strongest foe, be it the Number 1 ESPer or the strongest Magician but that power he had too also negated his bad luck and also beyond scientific explanation and thus, making him a Level 0 whom he is.
"Touma! Touma!" A sound of a little girl…to be precisely a nun in training echoes into his ears.
"Index? Why are you out here? Isn't it dangerous to go wandering alone out here?" Touma asks the nun as he knows that he, Index and anyone related to him is a target by countless of people from the Magic to the Science side.
"I was out alone Touma, until I met the 'Short Hair'." The nun referred to the young girl in Tokiwadai Middle School uniform who's exactly happened to be one of the 7 Level 5's in Academy City, the Number 3 Level 5, Misaka Mikoto.
"The name is Misaka Mikoto you nun! Geez, can you give respect to someone older than you?" Mikoto pouted when Index said her 'Short Hair'
"Actually Misaka, she's 15 years old." Touma corrected her.
Hearing Index actual age which is very different from her own physique, Mikoto is dumbfounded to see this actual little nun is the same age as her.
"I can't believe it!" Mikoto said as she looks at Index.
"Tell me about it, I know someone whose looks can be deceiving." Touma said as he refers to one of his teachers named Tsukuyomi Komoe.
Ignoring the two talked about Index's age, Index then said to Touma, "Touma, I'm hungry."
Touma just sighed and obeyed her wish, "Alright Index. Wanna come with us Misaka-san?" He said as turned to Mikoto.
"Y-Yeah! I-I'll follow. I don't have anything to do too." Mikoto blushed.
"Okay, then it's my treat, let's go" Touma tells them as the three walks to a nearby restaurant.
Unknown to them, a person is watching them not too far from a bench wearing typical casual clothes with his head is covered by a baseball cap which is not suspicious as that day was hot.
"So, that little nun is the famous Keeper of the Forbidden Library that contains 103,000 Forbidden Grimoire's inside her head eh? She's a perfect addition for my treasure." The man spoke as he saw Touma with Index and Mikoto slowly disappear from his view.
Suddenly, the man senses that he is trapped in within some kind of isolated field, "So, someone has noticed me huh?"
"That's right, now you are trapped. I know you've been watching Index all this time right! Admit it!" A certain priest appeared in his black robe with a barcode like tattoo under his left eye said to the man.
The man laughed and said, "That's right, and what will you do Magician? Or should I say…Stiyl Magnus of the Necessarius?"
The priest named Stiyl is surprised that this man knows his name and the organization he serves too, "How do you know my name! And what do you want with Index!" he asks
"I won't tell you why I know you and your organization. But, for Index…she's an irresistible treasure that I need to get." The man said while pulled out a gun like device.
Annoyed, Stiyl began to throw several fireballs at the man, and tried to charge at the man, tried to stab him with his fire sword.
The man easily evaded it and backed off from Stiyl while saying, "You're serious huh? Well, it's good. I've never fought a Magician before." He grinned while pulling out a card and inserts it to his gun.
Stiyl in confusion after what the man said and asks him, "Who are you anyway?"
Stiyl himself wondered until he heard the gun spoke [KAMENRIDE] then a weird sound came out from the gun like its on standby mode and the man raises his gun into the air and said, "Just a passing through Kamen Rider, remember that." Then he shouted, "HENSHIN" and pulled the trigger and it shouted [DIEND]. With that, he changed into a man in a cyan colored armor with straight black line covered his eyes.
"Well, let's us finished our business shall we?" The cyan colored armor named Diend said to Stiyl while pulling out another card.
"Tch! To think the Science side has that ability to create that device!" Stiyl said to himself while looking at the man who turned into the cyan colored warrior.
But then Diend said to him, "Before I can kick your butt, know that I'm not one of those Science lackeys so stop dreaming that this is created by the Science side…besides, I'm not from this world." He then inserts the card inside his gun.
His last statement surprised Stiyl, he never thought there is another world beside the world he live in, "What do you mean…not from this world?" he asks.
"You'll know soon enough" Diend said as he inserted his card and then heard a sound, [KAMENRIDE] and he pulled the trigger which the gun instantaneously shouts [CAUCASUS] which another so-called Kamen Rider appeared but this Rider has a gold armor.
"Am I going to fight you two!" Stiyl said as he sees another Rider and thought it will be 2 vs 1.
"To tell you the truth, I don't want to waste time fighting you so I leave him to play with you." Diend said while again, pulling out another card.
"WHAT! YOU COWARD!" Stiyl snapped by what Diend said to him.
"I'm sorry, but a thief is always busy…so…" He pauses to insert the card into his gun and then the word [ATTACKRIDE] is heard. "See ya" then he pulls the trigger and simultaneously he's disappeared after the word [INVISIBLE] is heard.
"H-Hey!-" Stiyl surprised but cut short at the Rider called Caucasus stood on his way.
"Where do you think you're going?" Caucasus said to Stiyl.
Stiyl immediately backed off and said, "Don't get in my way."
Caucasus then said back, "Or what?"
"Or you're going regret facing me…Innocentius!" Stiyl immediately summons Innocentius to fight against Caucasus.
"Oh~ Nice pet you got there…too bad that I have to defeat you and your pet." Caucasus said calmly after seeing Stiyl with his Innocentius.
"What do you have against Innocentius? That's it! Attack!" Stiyl orders his Innocentius to attack.
Innocentius began to charge at Caucasus with a loud roar meant to scare it's foe but the gold armored Rider seemed unafraid and still stand exactly where he is…unmoved.
"Good, he seems unafraid to die…" He thought as he looks at Innocentius attacks Caucasus but an unexpected thing happened.
Caucasus stares at Innocentius and just before Innocentius strike at him he muttered, "Clock…Up" and then disappear.
Stiyl stunned to see the person he wants to see obliterated by Innocentius is gone, "W-What! Where is he!"
"Ready to say your prayers…Preist?" Caucasus appears behind Stiyl and whisper to him.
Stiyl feels a chill running through his spine as Caucasus behind him, "H-How could….I-impossible"
Caucasus then appears again in front of Stiyl and immediately punches him causing him to fly several meters in the air. While Stiyl's on the air, Caucasus perform his Clock Up again and then immediately pressed his Zecter.
He turns his Zecter to perform his attack. His Zecter immediately shouted [RIDER BEAT], indicating thatit is ready to perform his attack . After that, He jumped and punch Stiyl right in the guts which Stiyl feels an unbearable pain as the Clock Up effect is gone.
"Urgh! D-Damn you…" Stiyl said his last words before he blacked out and after he fainted…Innocentius is also disappear since its master now are unable to fight.
The battle between a Rider and a Magician is over too quick that Caucasus himself seemed unsatisfied after the fight.
"Tch! What a weak person. Why I have to fight him?" Caucasus said before he disappeared too.
Unknown to them, a spiky blonde haired boy named Tsuchimikado watches the fight between Stiyl and the Rider and is impressed by how the Rider named Diend defeats the enemy.
"So, that Diend guy summons a fellow Rider to do his dirty work huh? Seems that guy with a fishing hat and a trench coat is not crazy at all, he knew these guys…Oh well, better help Stiyl." Tsuchimikado said before goes to help Stiyl.
At the same time, a certain man wearing a trench coat and also a fishing hat saw the fight. He seemed worried with the arrival of Diend in this particular world.
"So, Diend is here huh? If he's here…then Decade will be here too. Decade…I will stop your journey here." said the person while clenching his fists.
"I think this is the perfect time for me to use the Library of the 103,000 Forbidden Grimoire's to its fullest. Hehehe…This world will witness the destruction of Decade and the re-emergence of Super-Shocker!" The person said as he changed his appearance from a man wearing a trench coat and a fishing hat to a Military like uniform with a double headed eagle insignia on his service hat. He then surrounded by the cheer of a large group of men wearing black costume and they seemed prepare for battle.
This was only the beginning of what will be an adventure that will connect two different people from two different worlds against one common enemy that will determined not just the fate of one world…but all the worlds and all will be concentrated on one would be battlefield…Academy City.
Alright, this is my first crossover story and probably I will have several mistakes in term of spelling, characters or other things and even the way I write but if it's not what you all expect, I want to say sorry beforehand. I still have no idea for my old fanfic and I hope this will make you all a bit entertained. Please read and review. Any further question or anything else that might help me, please PM me...and no flaming. – fuji92