Disclaimer: I don't own either of the franchises. Kamen Rider belongs to Toei. The Fate Series belongs to Type-Moon.
Grand (Kamen) Rider in Chaldea
Chapter 1: First Impressions
"My journey…is finally…ending."
After so many years, he has finally reached the end of his life…again. How many times has he died already? Definitely more times than Fourze but certainly fewer times than Ghost. Only one person could beat Ghost in terms of the number of death.
Where was he? Oh, right. Oma Zi-O killed him without any effort.
That was a large blow to his ego.
Still, he got the last laugh. Zi-O managed to kill his older self with that RideWatch from the robot Zi-O. Speaking of which, where did that Zi-O even go, or the others for that matter?
Regardless, the recently deceased Rider focused on the now. He was finally dead. He does not need to fight anymore. He can finally rest.
"I hereby swear."
What?
"I will be all that is good in the eternal world."
No, not that.
"I will be the disposer of evil in the eternal world."
Anything but that!
"Thou, the seven days clad in the Great Trinity, come forth from the circle of constraint."
He hasn't even been dead for 5 minutes yet!
"Guardian of the Heavenly Scale!"
…Damn it.
Novum Chaldea…
"Yes!" Fujimaru Ritsuka, the last Master of Humanity, couldn't contain his excitement as a rainbow beam of light came from the summoning circle. That only meant one thing; A 5-Star Servant.
After getting enough Mapo Tofu to feed everybody in Chaldea for an entire month, his luck was finally turning around! Well, now that he summoned a 5-Star, his luck was going to be much worse, but that's for later.
As the light died down, the newest Servant of Chaldea stood in what was the center of the beam. He was dressed in modern clothes, unlike most of the normal Servants. Specifically, he wore a black suit with a pink-I mean, very light magenta shirt. Additionally, he had a camera hanging around his neck. Also, he looked pissed. Maybe that should have been mentioned first…
"Servant. Rider." Despite the look on his face, the Servant spoke to Ritsuka politely. Although with a faint trace of displeasure, "You're my Master, right?"
"Yes. Nice to meet you. I am Fujimaru Ritsuka. Welcome to Chaldea!" Ritsuka, for the most part, was not bothered by the Servant's expression. He was used to dealing with mad Servants by this point, "What's your name?"
"Decade."
"De…cade?" Ritsuka questioned the new Servant. 5-Star Servants were not only the best of the best but they also tend to be some of the most famous people in history. So who was this guy? "Your name's Decade?"
"Yes. Decade." Rider repeated himself.
"Not 'Rider of Decade' or anything?" Maybe he was like Tomoe or Moriarty?
"No." Oh.
"Okay… Anyway, do you have any questions?" After dealing with so many Servants, Ritsuka had learned that it was best to let them get used to their surroundings before prying in.
"I do."
"What is it?"
Suddenly, Rider pulled a strange gun from out of nowhere, aiming at Ritsuka's face, "How would you like to die?"
Leonardo Da Vinci (Rider Class) hummed in her workshop as she continued working on her pet project. Ritsuka had locked himself in the summoning room, determined to summon a new Servant while everyone else had gone to the new-but-old cafeteria for lunch. With so many Servants, there tends to be some ruckus. Seeing as the cafeteria was on the opposite side of Chaldea (and by extension, Novum Chaldea), that meant that they'll be no one to disturb her.
Finally… Peace and quie- "DA VINCI! HELP!"
Annnnnnd there goes her moment of peace. Less than a moment after, the sole Master of Chaldea came bursting into the room and shutting the door behind him.
"What is it Ritsuka?" Getting off her chair, Da Vinci sighed as Ritsuka tried to catch his breath from all the running he did. While she was more than happy to help him with problems, she was a bit annoyed at being disturbed.
"New -huff- Servant…" Ritsuka wheezed as he tried to explain what was happening, "Trying to -huff- kill me…"
"Oh, you managed to summon someone?" That really isn't what Da Vinci should be focused on, "What Class are they?"
"Rider…"
"So, I got some new competition?" A devious grin appeared on Da Vinci's face, "Why is he trying to kill you?"
"I don't know!" Again, Ritsuka was used to Servants trying to kill him, it was just that he usually knows why they want him dead, "He just pulled out his gun and tried to shoot me!"
"Why don't we head to the cafeteria? Everyone should be there." Da Vinci suggested, not really as worried as Ritsuka.
"But he's out there." Ritsuka, however, pointed out the obvious problem with that idea.
*Click*
"Leonardo da Vinci. Can't say I expected you to look like that." Well, that should have been the problem.
"Huh?" Said renaissance artist turned around to see, somehow, some guy was now sitting in her chair, taking a picture of them.
"How did you get in here?!" Judging by Ritsuka going pale, Da Vinci assumed that the man was the new homicidal Rider Servant.
"It's impossible to run from me," Rider boasted with a grin on his face, "You, Fujimaru, I thought you were some sort of hero that defeated four Beasts or something? I should be less terrifying than them."
"These are different circumstances," Ritsuka nervously laughed at Rider's comment. On the other hand, Da Vinci didn't see what was so dangerous with the new Servant.
"He doesn't look like much," She whispered to Ritsuka.
"He's a 5-Star," The Master whispered back, not taking his eyes off his new Servant. Oddly, despite trying to shoot the former earlier, Rider doesn't seem to be as bloodthirsty now that Ritsuka was now in his sights.
"So? You just summoned him, he should be weak at the moment," As a Level 90 5-Star Servant, she was more than confident that she would be able to take him on. Plus, it was in her nature to be overconfident in her abilities.
"Oh really?" Rider responded to the insult by aiming his gun at the other Rider Servant of the room.
"That's not really-" *BANG* Before she could finish, Rider pulled the trigger…and sending Leonardo Da Vinci flying through the previously shut door, ripping the door off its hinges.
"…" Ritsuka stared blankly at the now-unconscious Da Vinci for a moment before looking back at the still sitting Decade.
"So, have you figured it out yet?"
"…See ya!" Yeah… Now, he has a good reason to run.
Cafeteria…
Just as da Vinci had said, most of the inhabitants of Novum Chaldea were in or within the vicinity of the cafeteria. While it was not as crowded as it used to be in the original Chaldea, there were still a decent number of Servants. Over the loud noises from the various groups of Servants, a certain white-haired, red-suited Archer was searching for someone.
"Mash? Where's Master?" Emiya had been wondering where Chaldea's Master was. While Servants don't need to eat (although most of them do visit the place), the human staff of Novum Chaldea does. As one of the resident cooks of Chaldea's cafeteria, he usually sees said staff at lunchtime.
Today, however, he hasn't seen his Master yet. His food was starting to get cold.
"Hmm? Oh, Senpai wanted to try summoning a new Servant today. He should be here soon." Mash Kyralight, the Demi-Servant of Chaldea as well Fujimaru Ritsuka's junior, answered Emiya's question. Of course, she was being hopeful and assumed that her senpai would be able to summon someone.
"I see. I should make him some comfort food then." Emiya was the opposite and left to prepare for the more realistic outcome; his Master retreating into his room and crying at not summoning anyone. He also needs to check if there was enough space in the fridge for more Mapo Tofu.
"-ming!" A familiar voice was faintly heard.
"Wasn't that-?"
"I'm here!" Fujimaru Ritsuka came bursting into the cafeteria, sweating profusely due to running across the entire facility. Instantly, silence fell within the entire room as the Master of Chaldea tried to catch his breath.
"Senpai?" Mash was quick to go to his side, "What's wrong?"
"New Servant. 5-Star Rider. Tried to kill me. Knocked out Da Vinci." Ritsuka gave a very quick and abridged summarization of the last 10 minutes of his life.
"…What?" Needless to say, it took Mash a moment to process what he just said.
"Everyone!"
"Understood." "Yes, Master!" The many Servants in the room quickly readied themselves for battle, summoning their weapons.
"Who's the new Servant?"
"Don't know -huff-, called himself Decade," Ritsuka answered Mash's question, "He managed to defeat Da Vinci with a single shot."
"A single shot?!"
"What should us Casters do?" If the recently summoned Rider Servant could defeat the much stronger Da Vinci, another Rider, then the Caster Servants stood no chance.
"What's going on out here?" Emiya, who had been in the kitchen and was unaware of what was going on, came out to investigate.
"Hey, Archer! Someone's trying to kill Master!" A certain blue Lancer shouted at Emiya.
"I don't think I said that," Someone said from the corner of the room.
"Eh?" Everyone turned to look at the man that was quietly eating, undisturbed at the stares.
"How did you-?"
"I told you, it's impossible to run from me," Decade said before taking a bite from his meal, "I thought Humanity's Savior wouldn't run when a gun is pointed at his face." A gun that managed to defeat a Level 90 Servant, but that was beside the point.
"That's…the new Servant?"
"What do you mean you weren't trying to kill me?" Ritsuka found that part very hard to believe.
"I just asked how you would like to die," Rider stated as he finished his plate of food, "I never said that I would kill you."
"…What?"
"Also, thank you for the meal."
"…What?"
"Master… Isn't that your plate?" One of the Servants pointed out that fact.
"Hmph... I thought I would get a warmer reception. Seeing as I'm a Grand Servant," Decade said.
"…What?!"
A/N: I have no idea why I wrote this…
If Decade is too OP, it's because he is. That's it.
Before anybody says anything about Throne of Heroes summoning copies and not the real deal or Grand Servants only being summoned in the presence of Beasts, I know already. It's Decade, it doesn't need to make sense.
If Ritsuka seems to be a bit of a wimp, it's because Decade.
In case you haven't notice, this story is mostly Deca- I mean crack.
Leave a review and all that stuff.