Got really bored and decided to do something a little "out of my zone" and yes as the title says this is a Kamen Rider crossover only, this is something entirely new focused on the world of My Hero Academia.

This will follow the main story, but will also have a few side chapters such as the beginning of it all.

I mean seriously, why not? I read one story like this that was a crossover with Gravity Falls. So, why can't I at least try?

Prologue

Year: 2056

Location: Musufatu Japan.

One time. This place used to be built on dreams. But now, it is nothing more then ruin. The great tall buildings that reached the sky were toppled, the streets were full of rubble and derby. Many innocent lives were lost in the events that had unfolded over the decades, life itself was never the same from how humanity would know it.

However, deep underground was a much different story.

Some sort of laboratory comes into view full of different machines, and what appeared to be blue holographic blue prints for certain parts. And then it all focuses on a work bench with some man using some sort of electrical tool wearing a pair of goggles. He was most likely in his early 50s with a lot of gray hair, wearing a red shirt underneath a lab coat wearing old worn jeans and pair of old fainted brown work boots.

" That should do it. " The scientist said putting the final touches on some sort of machinery and lifted up his goggles revealing his brown eyes. Afterwards he rolled his chair over to another computer and rapidly began to type down some inputs. " With these set. It's good to go. "

He then looked behind him to see six different colored keys all bearing a different mark one being blue, brown, navy, crimson, orange and another one being ivory.

The scientist then moved over to another key only it was white. " You on the other hand, I still need to work out the issues. But it'll be fine. "

He then took a deep breath and exhaled taking in all of his creations. " All is set. Now for the main course of action... " the man said as then got out of his chair and went down a stair case and into a long hallway.

Soon enough he entered a large room filled with muplte telivison screens and right in the middle was large diagonal shaped platform surrounded by multiple sharp tips from the top all aimed at some kind of small blackish vortex. " Rothus? How goes the final proceeder? "

The one called Rothus was some kind of tall machine. It was human like, only it had no face instead it had a large red visor for eyes. It's body was made out of plates of orange metal covering every inch of it's body bearing a large white letter R on it's right shoulder.

" Final inputs ready sir. " The robot replied as motioned it's hands forward before it had fire red concentrated lasers from it's finer tips and into the anomaly. " Now, proceeding with portal stabilization. "

" Good work Rothus " The man complimented the machine and proceeded over to a nearby console and began to type in some kind of inscription. " Five years of research Rothus... " He breathed. " Five years. We can't let everyone's deaths be in vain. " The man paused and looked to a crack photframe. " They have taken everything from us. Our home, our freedom, and our loved ones. We cannot afford to fail now. "

" I couldn't agree more sir. " The robot replied as it then ceased firing the lasers. " Portal stabilization complete. Awaiting you're orders. "

" Were not out of the woods yet. " He replied still focused on typing in something on the console. " Make sure the portal stabilizes. And recheck the cables. "

" As you wish sir. " Rothus complied before all the sudden a loud rumbling noise was heard causing everything to shake making a little bit of dust fly into the air. " Sir, multiple hostiles detected! "

" Damn it! " The scientist cursed and then pressed down at a single key bar followed by a loading bar being seen beginning to load from 1 to 2 gradually beginning to rise. " They found us. " The bar then quickly reached up 10.

" We don't have much time Rothus. We need to activate the machine now. " He said firmly before grabbing some kind of large energy weapon from a nearby cabinet.

" But sir, we have yet to test it. " the robot protested.

" It's a risk we have to take! " He replied and began charging the weapon. " I need to retrieve the device, you stay here and defend the machine at all costs. "

" Yes sir. " The robot saluted and turned it's arms into large cannons while the scientist ran up the stairs. He then grabbed the device he was working on earlier and the key's that were nearby.

But all the sudden something bursted out of the window. The creature resembled some kind of strange reptile with an upside down jaw and had a clear exoskeleton showing off it's organs and roared at it's prey.

The scientist then fired off the weapon shattering it's head and went back down the stairs only to be tackled by another one of the creatures. Pinning him down on the ground and scratched his back making him cry out in pain. He then proceeded to take out a knife and plunge it right into it's throat making the creature screech in pain as it then fell onto the ground leaking green glowing blood.

The scientist quickly picked up the device and keys and grabbed his weapon and headed back down. He then closed the door and put the latch and rushed back towards the lab still ignoring the frustrating pain from his back as the sound of gunfire was heard.

Upon entering he shot at one of the creatures blowing its brains and splattering it all over the floor.

He then reoened the door and saw the room littered with many dead bodies of the creatures.

" Rothus, are you alright? " The scientist asked and set the five laired sealed blast doors to prevent any of the "big guys" from getting in. Even though it wouldn't last agaisnt them, it would at least still buy time.

" My systems are still running " Rothus replied as the scientist saw that the bar had now reached 95 meaning whatever he was doing is nearly finished. " Come on, come on. " After a few seconds the bar had reached up from 96,97,98,99 and then finally to 100. " Yes! " He then quickly typed something into the panel. " Everythings ready, the portal just needs to open.

" Then we must activate it immediately. " Rothus chimed. " Sir. I will hold them off, while you use it advantage to get to the destination. "

" No... " he replied looking to the machine. " Rothus. You must go. "

" I am not leaving you here sir. " Rothus protested.

" You must... " The scientist said and handed the device and keys to the robot. " You carry the weapon that holds everyone's hope and dreams. The future must change. "

" But sir- "

" Please Rothus! " The scientist begged. " We already lost so much, and this is our only last shot. So we've got to make it count. Promise Rothus, promise me that you will try and succeed. "

The robot was silent for a moment before responding and opened up a hatch storing the device and the key's inside. " It shall be done sir. I will help ensure our future for the better. "

" Thank you Rothus. " The building then shook once more. The scientist quickly headed over to his console and quickly types in something causing the spikes from uptop the vortex to fire. Once it happened very slowly it began to widen.

" Hurry! The portal is open! There going to be here soon! " The scientist cried out with the robot quickly hovering over to the platform and paused looking to the scientist.

" It was a honor working with you sir. "

" No, the honor was mine. Good luck old friend. " The scientist said smiling to the machine who then proceeded to the portal with the shaking increasing. He then quickly began to type in the codes needed for the machine. " Setting the date and time. This humanities last hope. " He then punched onto a switch causing a massive surge of energy to swirl around Rothus before all of the sudden he was engulfed in a massive surge before it then pulsated through the entire building leaving a large burnt mark on the platform.

Once that happened the door busted open making it fly and crash into one of the walls. The scientist quickly grabbed his weapon and attempted to fire but only got hit in the shoulder by some kind of spike making him cry out in pain and tumble back at the console.

" It's over. Tobashi..." A strong voice declared obscured in the shadows slowly walking towards him. " You've lost. "

" On the contrary. It is only another beginning. " The scientist smiled as a timer counting down from was soon seen on all the screens in the room taking the figure and who ever was with him by surprise. " I already knew you were going to kill me. And what better way to go out then with a big bang? " He asked but got no reply as the countdown continued to go down.

7-6. As it went down he grabbed a framed photo showing what appeared to be his family in a green field. 5-4. " I'll be seeing you all... " 3-2. " Really soon. I'm coming. " He said and then closed his eyes hugging the photo. 1-0. Once it landed a bright light flashed through out the whole lab and from the outside the light erupted into a massive explosion kicking up the dust and dirt from different directions

Once the explosion died out it revealed to be nothing more then a crater with 5 figures emerging who were obviously taking cover from the blast.

" *Whistles all impressed* When he said a big bang he wasn't joking. " A bird like humanoid commented checking out the crater from where she was standing.

" The fact that this human was able to hide for so long was pitiful. And yet admirable. " A weird looking plant-humanoid added also sounding to be female much like the bird.

" Tch, you always have to many compliments for the enemy, you fool. " A female bird like humanoid said in disproval.

" ... " a turtle like-humanoid only stared at the crater.

" Things have certainly gotten interesting it seems... " a racoon dog humanoid commented again.

" As much as I hate to say it. We must return to the master and report what happened. " The leader said with his arms crossed. " The enemy has traveled back in time. "

" Oooh, boy. The master isn't gonna like this... " A racoon dog-humanoid spoke up again pointing out the obvious of what was gonna happen.

To be continued.

Well? How's this? I mean come on, everything starts out in a certain way, like how in Ooo's the Greed were released from their long imprisonment, so I attend on doing something basic and little bit out of the ordinary to.

As for the type of enemies my Oc character will be facing shall be revealed in the next chapter. So stay tuned to see what will be happening next!