The extraterrestrial entity, Evolt, had planned to use the ten Lost Bottles to open wormholes and destroy the Earth. In order to stop him, the Kamen Riders marched on Pandora’s Tower to stop him. I, Kamen Rider Build, Sento Kiryu, managed to stop Evolt and destroy him once and for all. Now I find myself trapped in some sort of pony world!

Pony world? That’s a bit rude, that’s like calling the Earth “human land”!

But Twilight, there are so many possibilities for pony world in the multiverse! Also, a new version of Faust has shown up as well!

Faust? You know these creepy ponies already?

Well it’s more like I knew a Faust in my world that was always up to no good! But what will happen in Chapter 2!?

Faust has revived! This evil organization seeks out Pandora’s Box to change Equestria forever! And the only one who can stop them are the Kamen Riders!

Sento was amazed as he entered the Castle of Friendship alongside Twilight and the unconscious, Rainbow Dash. He had never seen such a place before, and new experiences is what he lived for. He had been lost in his own head and hadn’t been paying too much attention to Twilight’s questions.

“Excuse me? Are you in there, Mr. Sento?” Twilight asked, arriving in the throne room. She placed the unconscious pony down on her throne, while looking back towards the human.

“Oh! Forgive me, I tend to get lost in my own thoughts sometimes. Usually he’s here to knock me back into reality.”

“He? Oh! You must have a friend!” Twilight said, rather excitedly. Another human would mean twice as many to work with. Sento just frowned and looked down, as he jutted his hand into his pocket and pulled out the Dragon Fullbottle.

“You could say that we were the best match.” Sento said, staring longingly at it. The worst part about losing Banjou was the fact that there was no closure with him. He was simply missing after Evolt’s defeat. “Without him, destroying Evolt would have never happened…”

“Evolt?” Twilight asked as she sat down, using her magic to pull aside a scroll and a quill. She wanted to take as many notes as possible regarding this mysterious being and his home world.

“Evolt was an extraterrestrial entity who attacked the Earth. He aimed to absorb the Earth’s energy for himself so he could do the same to any other planet with sentient life.” Sento crossed his arms a bit and sighed. “He was powerful, but I managed to defeat him.”

“That sounds awful!” Twilight said, scribbling down some notes. “What was life like on your Earth, as you call it?”

“Earth was home for me as it was for many of us. Our country, Japan, was originally one country, but ten years ago a disaster we call the Skywall Incident occurred. It split our country into three separate ones: Touto, Hokuto, and Seito. For a while the three countries lived in peace with each other, all of them focusing on some sort of recovery… Until Pandora’s Box became a hot button issue.” Sento lifted up the White Pandora Panel, showing it to Twilight. “This is the White Pandora Panel, what’s left of Pandora’s Box.”

“Fascinating!” Twilight used her magic, again, to take the Pandora Panel toward her and began to look at it. “I assume these slots are for those bottles of yours?”

“Correct. There were ten special Lost Bottles that were manmade, that would have spelled the end of humanity had we not intervened. Evolt made his base in a large tower, Pandora’s Tower. We marched on it to stop him, but… Evolt…” It was the first time Sento had time to process what had happened. So much fighting had occurred at Pandora’s Tower that he hadn’t had the time to think too hard about what happened to Kazumi and Gentoku.

“He did what? You don’t look too good.”

“He killed our friends, Kamen Rider Grease and Rogue. There was no mercy.” Sento said simply. He clenched his fists a bit as he tried to calm down.

“K-killed?” Twilight gulped a little. Equestria was a relatively peaceful place, outside of the occasional threat that creeped its way in. Murder was something that simply didn’t happen in their borders.

“Evolt had no mercy for anyone. Who knows how many people he killed during his final rampage…” Sento remained quiet for a few moments. “But that’s why we had to stop him. We had to stop him at all costs. So, we used the White Pandora Panel to fuse our world with another Earth.”

Twilight was astounded. She had even stopped taking notes so that she could process what he was saying.

“You really combined two worlds into one!? Is even a thing possible within the realms of science?” Twilight scrambled as she wrote more and more down.

“Understand it was quite complicated. The White Pandora Panel was born from a guess I made.” Sento said, laying back against the wall. He was deep in thought. “The Panel also gave me the ability to understand your language.”

“Really?! How did that happen?” Twilight tilted her hand. She knew there were spells for helping ponies understand different tongues, but they were usually temporary and flawed.

“When I came by a post that said it led to this town, I couldn’t understand what was written. But a few moments after, the Panel glowed, and I was able to read it.” He smiled a bit and ran his hand through his hair. “It still holds many mysteries, that’s for sure. If only I were able to further study it… But without my equipment I don’t think I’ll be able to.”

“I’m sure we can figure something out!” Twilight trotted up towards him, leaving her notes behind. “Two scientists can surely figure something out, right?”

“Ha! Yeah you are. It’s been a while since I’ve actually gotten any real work done!”

“Ugh! You two just keep talking and talking and talking about the most boring stuff ever!” Rainbow Dash yelled, hovering over toward the two scientists.

“So you’re Rainbow Dash.” Sento mused, her boisterous attitude reminding him a bit of Banjou.

“Yeah I am! Only the most extraordinary flier in all of Equestria! At least I like to think that.” Rainbow mused as she took a good long look at Sento. The two locked eyes for a moment.

“Anyways, Miss Dash, I must ask you a few questions about your… confinement.”

“My what now?” Rainbow raised an eyebrow.

“You were transformed into a monster I called a Smash. I was forced into fighting you.” Sento explained, as she tilted her head a bit.

“I was?” Rainbow replied.

“Yes, you were, Rainbow Dash.” Twilight said, coming up from behind her. “It’s lucky Sento showed up when he did. He was able to… reverse whatever happened to you. And he also said you might have no memory of it.”

“Well… I don’t remember much of anything. All I remember was doing some flight training when… I don’t remember.” She put her hoof to her head. “I don’t remember anything at all except… These weird masked ponies forcing me into a box.”

Sento looked, at the very least, disturbed. He knew from personal experience what this was, and the fact that it was happening wherever he was now was not good. This could all lead up to a potential Evolt-level conflict if left uninvestigated. Before he could continue to question what had happened, an explosion could be heard occurring clearly outside the castle.

“What was that?!” Twilight yelled, flying toward the door.

“Oh I’m not missing out this time!” Rainbow flew as well, following behind her friend. Sento sighed and ran after them. They soon enough excited the castle, and we met by the mysterious masked Faust intruder. She was already transformed and ready to fight the mysterious masked man who had ended her experiment. Sento just sighed in frustration. He saw what was in her hand, the Transteam Gun. How did that end up here? Non one said anything, and she began to walk forward toward Sento.

“And you would be?” Sento asked, stepping forward as well.

“I am Trap Crawler… That’s what you may call me. And you are the primitive being that defeated our previous experiment, I assume.” Trap Crawler said, spite clear in her voice.

“Something like that. And I take offense to being called primitive. After all, I, in a certain manner, am responsible for your weapon’s creation.” Sento said, recalling the invention at the hands of Katsuragi. Twilight and Rainbow Dash soon arrived behind him, and looked forward at the armored being.

“I will not be talked down to like that! This technology was given to us, Faust, for good reason! The fates demanded it!” Trap Crawler yelled, shooting her weapon at Sento’s feet. “We know you have Pandora’s Box, and I demand you give it to us this instant.”

“Of course, no world is safe from this kinda thing, is it?” He said, pulling out his Build Driver and attaching it to his waist.

“That belt…”

“Hmph. Shall we begin the experiment?” Sento asked, pulling out crimson and violet colored Fullbottles. He shook them, while a smirk appeared on his face. He then put the two bottles into his Driver, causing it to make its announcement.

Bat! Engine! Best Match! Are you ready?!

“Transform!” Sento yelled, putting his hands out before the transformation.

The Dark Mobility King! BatEngine! Yeah~!

Trap Crawler roared out and ran forward at the now transformed Build, who had finally entered his BatEngine form. Build’s left fist was equipped with a large fist-like device, similar to GorillaMond’s fist. Half of his body was violet and the other half was crimson, very different from his default RabbitTank form. Trap Crawler struck with her Steam Blade, a weapon typically utilized by Night Rogue and Blood Stalk, which bounced off Build’s fist, when he punched.

“Maybe learn to pick better battles miss Trap Crawler!” Build yelled, making several punches toward Trap Crawler with his fist. He slinked backwards and disappeared into his own shadow, before appearing behind Trap Crawler and punched her in the back.

“Incredible!” Twilight said, beginning to take notes again. “It seems his powers change based on what bottles he uses with his belt!” Rainbow had to physically pull Twilight away from the danger. Normally, Rainbow would be heading head-first into this situation, but she still felt incredibly weak from whatever had happened to her.

“Stay back!” Build yelled, blocking several swift blade strikes from Trap Crawler.

“Who do you think you are?”

“I’m a Kamen Rider! I’m here to protect love and peace! And unfortunately, that can’t happen as long as you’re here!” He said, striking her in the chest and sending her flying onto the ground.

“That’s so awesome! The love and peace stuff are a bit sappy, but yeah punch harder!” Rainbow said, making sure Twilight didn’t get too close to this Trap Crawler figure.

“You think that’s the only trick I have up my sleeves?” Crawler pulled out her Transteam Gun and began firing a barrage of bullets at Build, who blocked the shots with his fist. BatEngine form allowed Build to once again sink into the shadows, before appearing up in front of Crawler. Crawler put the gun up to Build’s chest and fired, sending Build back a bit. But he didn’t seem worse for wear, as he brushed off the attack. “How… How are my attacks not affecting you?!”

“You made one major mistake in your plans to attack me. And that was not measuring your Hazard Level against mine.” Build said, beginning to crank the lever on his Build Driver. “Now, I’ve found the winning formula!”

Ready, go!

Suddenly a group of shadows began to appear from seemingly nowhere and began to charge upwards toward Build’s engine-fist. He began to focus that energy of shadows, before running forward and striking at Trap Crawler.

Vortex Finish!

“Like hell, I’m gonna get taken out by a hairless monkey like you!” Trap Crawler yelled, taking out the Spider Fullbottle and loading it onto the tracks of the magazine on the Transteam Gun. She aimed the gun at Build and pulled the trigger.

Steam Break!

Erupting from the gun was a large blast of sticky webs that were electrified. Build ran right into the webs, finding himself slowing down. But he was able to get his punch to make contract with Trap Crawler, causing a small explosion near her and sending her onto the ground.

She groaned loudly, feeling her transformation about to break. Not now, she thought, she couldn’t be found out just yet. Grabbing the gun, she used its power to quickly retreat by spitting out a large amount of foggy steam. Build sighed, knowing this is what she would do. After all, it was Night Rogue’s number one means of escape after losing a fight.

Build sighed a bit as he ran forward into the steam. He didn’t expect to find anything, but he was still disappointed in himself for failing to defeat his foe. Pulling out the two Fullbottles from his Driver, he returned to normal, before turning to face Twilight and Rainbow.

“No matter who uses that gun, they always escape the same way.” Sento said, walking forward toward them.

“Just who was that? You seemed kind of familiar with her.” Twilight asked, perching an eyebrow upwards.

“I’m not sure yet. But they were using a weapon I am familiar with. Two enemies, Night Rogue and Blood Stalk, from my world used that to transform and escape from sticky situations.” Sento said, rubbing the back of his head. “I thought I could force her out of her transformation before she could escape. Sorry about that.”

“Why are you sorry? You totally kicked butt just now! That was totally awesome! The way you just melted back into the shadows, and came back up? Awesome!” Rainbow said, causing Sento to smile a bit. Anything to feed his ego, he thought.

“Well I am quite the fighter after all! However, I am concerned about the fact she says she was from Faust… You see, Faust was an organization in my world dedicated to human experimentation research. They were responsible for turning humans into Smash.”

“That sounds awful. Your kind really…”

“Yes. It’s sad to say, but humanity is far from perfect. We go to war over the smallest things. Power, money, greed… Kamen Rider, though, protects the peace. That’s what I believe. And if there are people to protect, then I have a duty to protect.” Sento said, his ego fading a bit for the moment. “But in the end, I failed to protect the ones I deemed by friends. Maybe if I had made different decisions… Kazumi… Gen-san… Maybe they would have survived.”

“Mr… I mean Sento, you can’t blame yourself for that.” Twilight said, trotting up to the human, who was once more clenching his fists. “You did all you could to help your world and your friends. And friendship is one of the most important things ever.”

Sento just closed his eyes. He was, at the very least, responsible for Kazumi’s death. If he hadn’t built the Blizzard Knuckle, then maybe… maybe Kazumi would have been able to survive the fake Crow’s onslaught. He sighed once more.

“Maybe you’re right…” Sento said, thinking a bit about Banjou for a moment. He hoped that Banjou successfully made it into the New World… He hoped.

“Of course, I am.” Twilight turned around. “Now come on, I want you to meet the rest of my friends, especially if you’re gonna be stuck in our world!”

“Right.” Sento nodded and followed behind the two ponies. He looked up at the sky for a moment. That everlasting sky. “Banjou…”

Banjou groaned a little bit, as he awoke from his slumber. His head was killing him, and he wasn’t, to be frank, even sure where he was. The last thing he remembered was flying up into the rift with Evolt. But now… he seemed to have survived somehow.

“Sento? Yo, Sento!” He yelled, as he got up from the ground and looked around. He seemed to be in some sort of clearing in a forest. Two things he would have never expected. “Hello?! Is anyone there!? Damn… I don’t think anyone’s around.”

Banjou kicked the ground a bit. He was glad to be alive at the very least. However, that certain elating feeling soon passed as he heard some growls come from behind him. He looked behind him to see glowing eyes, piercing through him, from the bushes that led into the forest proper. Gulping a little, he backed away, as the growling got louder and more agitated. And so, he ran. As fast as his legs could take him away from this situation. Hopefully, he could outrun wooden wolves.

Author's Note

I want to use the non-used Best Matches in this fic, so why not start with my favorite design of them all BatEngine? Things will get harder for our hero, yes, but remember he has a Hazard Level of 7+, so the Transteam System will have to be... modified in order to stand a chance against him. Again, I hope you enjoyed this chapter, I enjoyed writing it. I'm always open to criticism and story ideas, so leave your thoughts in the comments. Thank you again for reading!