Disclaimer: I own nothing about the Ambition of Oda Nobuna or Kamen Rider. The only thing I own here is my original character.

First Slice: The Strange New World

Sasaki Motoharu stood in front of a mirror for one last check. His face was clean shaven, teeth all brushed and sparkly, hair all combed. No wrinkles on his black suit or his necktie and glasses neatly on his nose. Apple iPhone fully charged and his briefcase had everything he would need for his first day on the job. 'Alright, let's do this!'

The 21 year old Japanese man grabbed his coat and then left his small apartment with a light skip in his step. After all, he had recently been hired as a new addition to the financial department of Toei Company. The competition had been fierce and some of the interview techniques had been extremely stressful but he had persevered and landed the job. Now he got to work for the company that made the Super Sentai and Kamen Rider series, programs that he had enjoyed in his youth. He did miss watching those shows but that had been sacrificed when he had to devote more time to his studies to get into a good high school and university.

Perhaps as part of the orientation, maybe the new recruits would have to marathon some of the movies or specials with those new characters? That would be interesting.

One stressful morning commute later (and the cool fall weather not helping), Motoharu arrived at the corporate headquarters of Toei Company. Next stop was the conference room where the orientation would take place. As he headed to the elevator, he spotted one of his immediate seniors carrying two large boxes and struggling to get into the elevator.

"Good morning, sempai. Do you need a hand with that?"

The elder man looked grateful for the offer. "Yes, that would be appreciated."

"What are these anyway?" asked Motoharu as he took one of the boxes before entering the elevator.

"Prototype Lockseed toys sent over from Bandai. As part of your orientation, we're having your group participate in an exercise on how we should work out our marketing campaign for this new batch of merchandise. Don't worry, there's also a Sengoku Driver in the box as well so you can hear how the Lockseeds would announce themselves. Maybe that'll give you guys some ideas."

"That sounds interesting. Thanks for the heads up." The two men engaged in some idle chatter for a bit as the elevator went up. They finally reached the 10th floor where the orientation would be held and as they stepped out of the elevator, they both heard a cell phone ringtone.

"I should get this. You go on ahead," said the elder man as he placed his box down to take the call.

Motoharu nodded as he moved along the hallway. As soon as he turned right to an empty corridor, he felt an odd sensation of falling deep into nothingness while his vision turned black…

The next thing he knew, he found himself lying on his back in a grassy field with an open blue sky above him. 'What the hell…?' This shouldn't be possible. He had been inside the Toei Company headquarters just a minute ago. The box he had been carrying was no longer with him as well.

"Where am I?" Motoharu would be further confused by hearing the sound of horse hooves roaring, the sound of guns firing and the desperate shouts of foot soldiers armed with spears and katanas. Bodies of fallen soldiers littered the area. 'Geez, this feels like the Warring States Era…'

"Hey, who's that guy?!" He turned to see some soldiers; all dressed in infantry armour, that now have their attention on him.

"That must be an enemy! Who else would dress weird like that?" That was all the reason they needed before they started attacking him.

"Gotta move!" Wasting no time, Motoharu got to his feet and began running while keeping himself out of harm by dodging those spears and the arrows that were fired at him. 'Dammit, is this some freaky dream I'm having?!'

"Boy, it's dangerous!"

He barely had time to register that voice as he was covered by someone. A short built Imagawan foot soldier that came and picked up Motoharu's body under his arms before taking off. For now, it seems like they were out of danger.

Once they made it inside the forest safely where no foot soldiers were lying in wait, the short built foot soldier dropped Motoharu down with a tired sigh and sat down with his back to a large tree trunk. "Thank you for saving me but why did you do it?"

"Kid, you're a shinobi of the Oda right? That body movement isn't ordinary."

"What?"

"I worked for the Imagawa lord but, that person hates poor shaped men. I didn't think I could be promoted." What had been odd about the foot soldier's face is that it looked like that of a wrinkled monkey. "So, in the middle of the confusion of this battle, I thought of going over to Oda. Hey, kid, would you introduce me to the Oda lord?"

"Er, I'm no shinobi." Motoharu had been part of the University's Kendo Club during the time he had been a student. Thank goodness that he had developed those reflexes training intensively with the senior kendoka.

"Am I wrong?"

"I am Sasaki Motoharu and I am a new employee of Toei Company. In any case, I am not a warrior."

The other man shrugged. "Even I am a son of a farmer. However, right now it's a chaotic world. If you can get achievements in battle, you can get promoted. My dream is to become the lord of a feudal domain!"

"A lord of a feudal domain…."

"Yeah. As a man, having been born into this world, I can't think of a life without wishing for a feudal domain of my own! Because if you become the lord of a castle, you'll be popular with the ladies!"

'… What?' That was really the last thing Motoharu had been expecting to hear. But still, there was a certain earnestness about that foot soldier that he found endearing. "You look like a good guy, and you saved my life. I'll gamble on your dream. Let's try going together to Oda!"

First, he needed to get his bearings and remember all the things he had learned from taking Japanese history as one of his optional courses during his University years. Assuming this is really the Warring States period, they needed to head to Owari which was Oda territory. He didn't have high hopes of getting employment in the Oda army, but he somehow felt that things would go well. Oda Nobunaga is a progressive Feudal Lord who was more focused on competence. Origins didn't matter for him.

With a plan in mind, the two men exited the forest but…

"Fugu?"

The short built foot soldier was suddenly crouching while pressing his chest.

"What's wrong?" asked Motoharu in concern.

"…I was hit by a stray bullet… I wasn't lucky…"

"W-What did you say?" At once, the area around the chest was dyed in red as blood came out of the wound. Motoharu's face quickly became pale as this was his first time seeing a person's death up close. While shaking, he laid the foot soldier on the side of the road, at the side of a Buddhist statue.

"…..Kid. This is it for me. You should go by yourself."

"I can't leave you behind!"

"You never know when those with ambitions will die. This is the norm for the chaotic world of the Warring States….I will give my companion to you. Please fulfill my dream of being a feudal lord and being popular with the ladies."

'I'm not a goddamn harem seeker!' Still, Motoharu would say whatever it took to give a sense of comfort to the dying man. "I'll carry on your dream. What's your name? Once I become a feudal lord, I'll make a huge grave for you."

"….My name is…..Kinoshita…Toukichirou…."

That name sounded familiar. It took the other man about ten seconds to realize that name. "… no freaking way."

"…later, kid. Live, for the ambition of becoming popular."

Whoa. Wait a bloody second! By Kinoshita Toukichirou-isn't it Toyotomi Hideyoshi? The man who rose up to conquer Japan by working for Oda Nobunaga? Isn't he a hero among heroes who got the greatest promotion in Japanese history? Thinking about it, short built and a monkey face- and his friendliness, there was no mistaking the fact that it was Hideyoshi. And he was dying right in front of Motoharu.

"Oi, don't die! If you die, Japanese history will be changed in ways I can't imagine! If you don't work for Oda Nobunaga, then…!"

"….Who is Oda Nobunaga? ….The name of the Lord of the Oda is…..Nobu…..na…." Those were the man's last words before he finally took his last breath and left this world.

'This isn't happening… it's all a dream, right?' No matter how much he tried to convince himself (via lots of pinching of the cheeks), Motoharu's reality remained the same. 'Am I going to die here…?'

No, he wouldn't accept that. His life had been taking some positive turns back home and he was damned if he would just roll over and die in this Warring States period! He took a deep breath, forcing himself not to panic and think. He needed to turn things around to ensure his survival for the time being. What assets did he have?

He quickly checked his briefcase. Among the contents were a blank notebook, a pencil case with pencils, pens and two financial calculators (a habit drilled into him thanks to his mother consistently nagging that he bring a backup calculator for his accounting final exams), a bento, bottled water … and a Sengoku Driver?

It felt a bit different and weighed a bit more. As if it was made out of something else other than plastic. Filing that anomaly away, the last item he could find was a Lockseed labelled 'L.S-07' but the colour looked red. The exact same colour as the blood that he saw gush out of Hideyoshi earlier.

His thoughts were interrupted as a white horse galloped past him with a beautiful blonde girl riding it. She had a red cloak on her shoulders along with black armour like that of a warlord in this era. One of the enemy soldiers tried to charge at her but her speed was too much. With a well-timed dismounting of her horse, she easily dispatched of that man.

"Huurraagghh!" Another enemy came out of nowhere and tried to slash her from above but she blocked his strike. Unfortunately, the damage that her katana had accumulated was enough to shatter the tip of her blade, sending it flying off.

With his enemy without a proper weapon, the male soldier prepared to advance. "Your life is mine!"

Motoharu knew that he should get out of here. Stay focused on his goal of trying to survive and eventually return home. But his sense of ethics screamed at him that it would be wrong to turn his back on someone who needed help. Especially a pretty girl.

'Goddammit… how am I going to do this?' He thought back to his assets and remembered the Sengoku Driver had its own sound effects along with the Lockseed. Maybe that would be enough to scare off that man.

"Here goes nothing…" He moved as quickly as he could to get in front of the blonde girl and in front of the other man. "Stop right there!"

The enemy soldier paused for a brief moment. "Are you an Oda soldier too?"

"No but I'm not the type of man who would turn his back on someone who needs help!" growled Motoharu.

"Hmph… and what can you do against me? You're unarmed!"

Motoharu held up the Lockseed and smirked. "Oh, I wouldn't know about that." Alright, time for the mechanized voice to do its thing. He flipped the switch sideways to unlock the Lockseed.

BLOOD ORANGE!

But what happened next pretty much caught everyone by surprise. A zipping sound was heard and the enemy soldier in front of him began freaking out. "By Buddha, what is that?!"

'He's looking above me?' One quick glance showed that a huge orange fruit hovered in the air with a portal just a few inches above it. It was a portal to that weird forest, Helheim Forest if he recalled correctly from all those promotional materials that he kept running into while doing his application and interview at Toei. 'If something like that works, then…!'

Acting quickly, he placed the Sengoku Driver on his waist and it automatically attached to his body. Next is to attach the Lockseed in place just like how he saw it on the commercial advertising the latest Kamen Rider series.

LOCK ON!

His Sengoku Driver began blaring out some music played from a rock guitar. Now for the finish. "Henshin!" Motoharu then reached for the Cutting Blade switch and pressed it down to slice open the Lockseed. Inside was the image of the blood orange's inside while at the bottom was a picture of an orange slice styled sword surrounded by black flames.

BLOOD ORANGE ARMS! JA NO MICHI ON STAGE!

At that point, the orange dropped and landed on his shoulders, engulfing his head. He felt his body ripple and the energy wrapped around him to form a dark blue bodysuit which had quilted leather. On the arms and legs were golden bracers and leg coverings which added extra protection. After that, his head was covered too with a blue helmet which had a silver and black mouth guard and a red sword–like decoration on the forehead. The visor was appeared like an orange slice but in red. The orange then sparked and began to disassemble, the red sides folding in half to form the shoulder pads, the red chest plate with black flame marks coming up from the bottom.

Appearing in his hand was a short scimitar which was styled after an orange slice but red in colour. On his side was a black sword with a gold line on the blade with a trigger under the sword guard and the cross–like guard looked like it actually doubled as a gun.

"W-what are you?!" There was fear on the man's face, a stark contrast from how he had been so confident and sure of himself not too long ago.

"I am…" Motoharu paused for a moment upon noticing that his voice in the suit sounded very different, exactly like that voice actor who played Emiya Kiritsugu on the Fate Zero anime. He can have his fangasm later. Right now, he had an intro to finish. "Kamen Rider Bujin Gaim."

"B-Bujin Gaim? I've never heard of such a name…!"

The crimson clad warrior prepared his weapon. "Then let that riddle accompany your soul as you head to the other world."

That was more than enough to get the other man up and running away from the area. 'Good, he's running. One problem down.'

He lowered his sword before turning to the blonde girl. "Are you alright?"

"Yes, I'm fine thanks to your efforts." She paused for a moment as her thoughts came together. "Are you some sort of onmyōji?"

"Not exactly. Just someone both blessed and cursed." The conversation was soon interrupted by the thundering noise of approaching horses. The soldiers were carrying yellow banners with a black flowery crest in the middle. One of the horses trotted closer, with the rider being a young woman with a ponytail in blue garments, silver armour and sporting a large blue-handle, European-styled halberd. She was quick to point that weapon at Motoharu.

"Get away from Nobuna-sama this instant!"

That name echoed in his head. 'Didn't I hear that name before from Hideyoshi?'

"Riku, stop! That man saved my life."

The words from the blonde girl seemed enough to stop the other woman. "Is that so?"

"Yes. Now keep pressing forward and rout the Imagawa."

"… by your will." With that said, she took off along with the other soldiers.

"Um… just to make sure I wasn't hearing things, she addressed you as 'Nobuna-sama'?" asked Motoharu.

"That's right. Head of the Oda family, Oda Nobuna," replied the girl coolly.

"Strange. History as I recall it has Oda Nobunaga as the head of the family in this time period."

A puzzled look appeared on the female warlord's face. "Who's Nobunaga?"

"Never mind."

"You really are a strange man," mumbled Nobuna to herself before heading to fetch her white horse from earlier.

'Oh… kay. So not only am I in the Warring States era and Hideyoshi is dead but I'm standing right in front of a gender flipped Oda Nobunaga.' Geez, what else should he expect? Monsters of the week that he would have to fight as a Kamen Rider?

TO BE CONTINUED…

Doing this on a random whim thanks to reading a lot of other stories of OC being dropped in other world and getting Kamen Rider powers. My Kamen Rider familiarity is limited so I'll be mainly looking at the wiki for stuff.