Kamen Rider Eikaider

An 'Eiken' and 'Kamen Rider' crossover fan fic

Prologue

One night over a year ago…

Three people were sneaking into a tall building, through a wide air duct crawled a small group of three people, including a middle-aged man sporting a navy blue fedora and overcoat, a brown-haired 18-year-old man in a dark-green high school uniform, and a middle-aged woman in casual black clothes.

I was one of those three. In fact, I, Densuke Mifune, was the 18-year-old Japanese man with those two.

I've known these two since I was 4 years old, they're good friends of the family, albeit strange ones. The two of them run a private detective agency. I had forgotten what got into my head to say that I wanted to be super-cool detectives like them. Had I known they'd train me, I wouldn't have said that. It's not to say that their training methods are dreadful, they're just so painful and exhausting that I could not tell if they were training me to be a spy, a ninja, or a hardboiled detective who knew how to kick ass. I noticed one day that if I had not joined them, I would've remained unnoticed for the rest of my life and because of them I've wielded that to my advantage. The only place closest to a regular school I could go was a school for boys, so I have little experience with girls so I can be pretty shy around them.

The middle-aged man, whose name was Takehiko Watakawa, was a great detective. That intelligent gentleman of a detective had silvery eyes that were like two full moons and his gray hair was shaped just like mine, he once said that it was to remind us of myself committing to his promise to make me as amazing as possible. He had a graceful yet robust build. His preferable wardrobe was a standard style usually from the 1940s or 1970s.

The middle-aged woman, Haruko Tsukada, is Takehiko's 31-year-old blue-haired apprentice. Her pet peeve is the fact that that the police force never took her skills and abilities seriously because of her extreme bust size, sex symbol worthy body, and pretty face, this left her with plenty of bad taste in her mouth toward the rest of the force. However, Takehiko took her potential seriously and took her under his wing as his apprentice.

"Out of curiosity, Watakawa-san," I asked, "Why are we going up here again?"

Watakawa-san confessed "I've helped this organization design and build a system to harness powers of certain crystals of powers that get power from certain aspects such as the Earth, but smalltime underlings grouped together and started corrupting it as a new line of weapons or drug trade. So we're going to retrieve the crystals and the belt before they take it for their own ambitions."

"Boss," asked Haruko "is this organization called Land Blood going to use this new power you created to conquer the world?" "Yes, my dear apprentices" nodded Watakawa-san grimly, "They're called Planet Aima Crystals. In case I'm not around to explain to you immediately, you can easily identify them from their glowing auras of power, the internal symbolic engravings, and their colored triangular shape. Within a single crystal is all the spiritual blood of a certain single thing object or creature according to the symbol inside, and within it is the worldly information of said symbol. People who would have these Crystals can obtain power from these Crystals and have it bond to either their bodies, minds, or spirits."

"So these guys might be planning to weaponize these Planet Aima Crystals or pose them as the new illegal drug fad, selling them at expensive prices either way?" I deduced. Our boss had nodded to my question in response. "Doesn't 'aima' mean 'blood' in Greek?" asked Haruko-san. Again our boss nodded. She then scoffed "Land Blood, Planet Aima Crystals, what's next? Blood sacrifices or blood rituals?"

The only response she got from her sempai and me was silence, meaning that something else involving blood was also involved in these matters.

Haruko-san asked "What else do they do, boss?" "Land Blood sorely believes that blood is life and power in the name of the Planet Aima Crystals," answered Watakawa-san "so they pick off plenty of neko-mo shakushi-mo out of the blue and kill them to collect their blood and use it for what they believe may mass produce the Crystals."

(A/N: 'neko-mo shakushi-mo' is the Japanese translation of 'Tom, Dick, or Harry')

Haruko-san gulped "Is it… successful?" Watakawa-san placed on a grim face "Sort of… but Land Blood's horrid methods only cause the Crystals reproducing new ones have them to respond in horrible transformations rather viciously. In a way they're almost alive and psycho-reactive."

Once we had reached the highest floor inside the building, Watakawa-san finished "According to the legend that I created these from, when purified and shattered, a Planet Aima Crystal can heal this world in a certain aspect and grant a wish. It is my wish to see that the true Planet Aima Crystals and the device I've perfected are brought out of evil hands."

Crawling right out of the air duct on the highest floor, Haruko-san and I spied around and found a pillar of light. What that pillar was shining down upon was a metallic suitcase sitting on a pedestal right in the center of the room. My instincts told me that it seemed all too easy, so I told my mentors "If we're going to take that, we have to be extra careful and quick." "Good idea, Densuke-kun" stoically nodded Watakawa-san. Haruko nervously nodded "Right."

Watakawa-san stayed by the opened air duct and watched as the rest of us reached the suitcase. The two of us counted to three and pulled it away so we would get away.

But as soon as we had reached the air duct…

POW! POW! POW! POW! Gunfire was heard from behind us!

Watakawa-san ran from his post and protected us from the oncoming hail of lead…

Watching the crimson blood flowing down his shirt, we instantly found out wasn't wearing protection. He was going to die some time in the next few moments before us!

He had fallen to his knees and we each caught him.

Haruko pulled out her own gun and shot the shooters in the shadows who had shot our teacher, boss, and good friend.

Coughing out blood, he said to us "Please don't grieve, this is my repentance for bringing the Planet Aima Crystals to those devils." "Watakawa-san," I quietly cried.

"Densuke-kun," he said to me as he turned to me "everything I possess; the original Planet Aima Crystals and the tool to wield them in that suitcase, and ownership of the Eiken Dormitories on Zanshono Island, I pass onto you." "But, sir, I'm just a high school graduate not from that island, I'm not ready" I said. Watakawa-san sighed to me, "Nor was I when I was merely 20, but you must take my place."

Watakawa-san continued, "Take this entire year to prepare for living and working on Zanshono Island, Densuke-kun… you're the owner of the Eiken Dormitories now." I sniffed in tears a bit, and worded my promise to him "I understand, sir. I will."

Takeshiko's apprentice, Haruko Tsukuda, begged "Boss… don't say you're going to die! PLEASE!" Takeshiko took his hat off, placed it on Haruko-san's head, and smiled "Carry on in my place, Haruko-san. And watch over on our friend." Finally, in our hands… our boss died. Haruko-san's tears cascaded down her cheeks like Niagara Falls as she screamed "BOSS!"

We both grieved over the loss of our boss, but then I heard the sounds of a voice on radios calling to someone. I just realized that soon someone would meet more of the shooters' friends.

Hoping not to face any trouble without difficulty, we turn our one last hope to the case. Opening the suitcase, we see inside it a gold oval-shaped buckle with a mirror-like interior and a blue revolving disc with three specific slots, each to apparently have a single small crystal slotted into it, as well as triangular gems with glowing auras. These must be some of the original Planet Aima Crystals——

A golden-colored one with a mark similar to a 'J' and 'F' fused together, a yellow one with a cyclone shape inside, a prismatic one with a wave-emitting figure, a green one with a mountain-like engraving within, an almost silvery crystal with a sword and shield inside it, a red one with a flame shaped engraving inside, a blue one with a raindrop shape inside, a black one with an engraving resembling a demonic face within, a snow white-colored crystal with a 5-pointed star inside it, and finally a clear one with a mirror shape inside

Haruko reads the labels next to the items inside the suitcase respectively; "'Transformation Belt Eikaider'? 'Joker', 'Cyclone', 'Force', 'Grand', 'Metal', 'Fire', 'Aqua', 'Shadow', 'Light', and 'Clear?'"

Haruko quickly said "According to the instructions, this buckle can become a belt and later place you in a powered exoskeleton of some sort at your command. Sounds too much from 'Kamen Rider', but given the situation we're in we should try it. And fast!"

"Whatever the belt does," I gulped as I quickly placed the buckle on my abdomen "it better be good." The sides of the buckle then produced silvery straps that connected from behind me, becoming high-tech looking belt.

I had called out "Henshin!" and finally slapping the sides of the belt——

"EMPTY!" announced the belt, and then white particles of light flowed out from it before encasing me in a new black bodysuit with white pieces of armor. The chest armor has a crystal-like triangle-shaped unit that appears to be separated into three arrowhead-shaped units in the center-front over my heart, it's connected to silvery outlines that stretch throughout the armor. The helmet has a slight beetle/grasshopper theme with a 3-pronged silver trident-like crest with a clear tiny orb in its base on the brow of the helmet, it's got a pair of big white eyepieces, a smooth gray mouth plate, and an antenna on the helmet behind the crest and yet sandwiched between its prongs.

(Kamen Rider Eikaider, Empty Form— height: 180cm; weight: 80kg; punching power: 1t; kicking power: 3t; top running speed: 100m/10s; highest jumping height: 10m; senses: 1km; defense rating: 3; finisher power: 10t)

"What is this supposed to do?" I've asked. Haruko gulped "It says that the armor the belt brings out takes on the character of its wearer and amplifies it to a compatible use. We've worked so hard too."

"RAZOR AND COUGAR!" cried out a man's voice.

After that, a pulsating sound was heard somewhere close by us. Then a rumbling sound coming from below…

"Look out!" screamed Haruko.

But it was too late, bursting from the metal floor was a humanoid monster with monstrous strength——

Its fur was brownish tan and short, it possesses a cougar-like head, a dark furry tail, and paw-like feet. His fingertips and his toes are armed with sharp curved black claws. His arms and legs are equipped with silvery armor lined with what appear at first glance razor blades. Over his hands are metallic gauntlets are long claws resembling razors.

We were shocked beyond reason upon this creature's arrival.

The beastman picked up one of the nearby radio communicators and said into it, "I've taken my level 2 Fusiant form. All of the security guards protecting the suitcase that bastard, Watakawa, brought in for our organization. Don't send any back-up, you know how territorial we cougars are." Then he smashed the radio with one bare hand.

Then he turned and spotted the two living intruders; us, then he purred out "Live prey."

Haruko-san lifted her pistol to the Razor-Cougar Fusiant and fired several shots, however, each shot proved ineffective against him. He leaped at us, razor blades extended at us… I blocked his lunge with my armored body. While I crashed through a wall, he crashed to the ground.

He looked up at Haruko-san and said to her "Who blocked me? I didn't see anyone in my path other than you, even you couldn't have done that. Damn, that hurts like hell!"

The monster didn't see me block him? I was there in front of him defending one of my teachers, who is still alive, and he didn't see me?

That was when I've realized that my body just became invisible.

I found a instruction booklet inside the suitcase that the gear and crystals came in and took time and advantage to skim through it before the monster would find the humanoid-shaped hole in the wall or return to killing Haruko-san.

These were also directions to other pieces of equipment he had been meaning for a successor to possess in case he failed in stopping organizations like Land Blood and these monsters called Fusiants.

Finishing the reading, I reached for the Cyclone, Joker, and Force Planet Aima Crystals and slipped them in the slots in the buckle.

"CYCLONE-BODY!"

"JOKER-MIND!"

"FORCE-SPIRIT!"

"CYCLONE-JOKER-FORCE!"

Upon inserting the three in, I've felt my body, mind, and spirit within the armor transform into a greater form than I had felt earlier before seeing its outside change too, in a reflective surface on the wall next to me——

Most of the armor turned bright yellow, the outlines turned prismatic or crystalline that sent off rainbow-colored rays of light when shined on, and the eye-pieces had turned bright red, also a cloud-white scarf appeared around my neck and had its tails hang down my back. Then upon the flash of the eye-pieces and orb in my horns, a strong burst of wind flowed from me and knocked down the Fusiant.

(Kamen Rider Eikaider, Cyclone-Joker-Force Form— height: 180cm; weight: 80kg; punching power: 2t; kicking power: 5t; top running speed: 100m/3s; highest jumping height: 50m; senses: 10km; defense rating: 6; finisher power: 25t; Gale Kick: 32t; Gale Beat: 29t; Cyclonic Burst: 32t; Tornado Slash: 32t)

Haruko-san turned to my new form and gaped at it, she breathed out "A golden warrior of the wind?"

The Razor-Cougar Fusiant spotted me and asked "What the hell? Where'd you come from? Who the hell are you?" He removed some razor blades from his shin guards and threw them at me like kunai.

I moved out of the way, but surprisingly for me it was easy; most of everything was in slow motion to me but in reality I can move at incredible speeds and have equally fast reflexes thanks to the Cyclone Crystal.

I rushed up to the big bad cat and unleashed a barrage of punches onto him like debris in a tornado. I thanked the Joker Crystal to boost my skills in a flash while transformed.

As for the Force Crystal's help, I had started feeling something guiding my blows in the right places, like the Force did for Jedi Knights in 'Star Wars'.

I then pressed the center of the revolving disc containing the Crystals in its slots——

"MAXIMUM CHARGE!"

The winds whipped faster and harder around me, I ran towards the Fusiant and leapt up performing a flying side kick at the feline Fusiant's face——

"Gale Kick!"

As soon as my kick made impact, the monster was then knocked away with great force and sending a powerful shockwave throughout the entire building.

Windows shattered around us and the sharp winds my finisher created had torn up the machines around the area, we had to get out of here before this building could collapse.

On the ground, where the Razor-Cougar Fusiant crashed, he struggled to stand again for a few moments before finally falling over. He went up in a small explosion of fur and blocks of steel. It revealed a barely conscious man and two Planet Aima Crystals. To make sure no evil hands got their hands on them again, I collected them from the bastard.

"There was a use of my Empty Form," said I, the now colorful Kamen Rider, to Haruko-san, "It tapped into my outer characteristics seen by others and amplified it by 120 percent." Haruko-san asked me, "It gave you the ability to turn invisible and stealthy at will?" "Yes," I nodded.

She held onto me, so she'd be safe when leap away from here.

"Bastard…" growled the former monster "who the hell are you?!"

I've presented myself in a theatrically dramatic fashion, "I am the three swords of victory in one warrior, Kamen Rider Eikaider!"