Author's Notes:

Hey everyone! I guess you're probably wondering why I chose Sento, Takeru and Haruto as three of the main Riders? Well you see their shows have many elements that Fate Grand Order has, with Build having the science aspect and, I also want Da Vinci to have a fellow Science geek. Wizard for of course it has magic obviously, and as for Ghost he is pretty much like Ritsuka, someone who has befriended a lot of Heroes... So, I'll be adding him. So, that Ritsuka can have someone to relate to.

But before all of that, I just want to thank you for reading my Fanfiction... I didn't expect it to be this popular, well I guess you like the story very much.

Disclaimer: I don't own any of the characters appearing in this Fanfiction, they belong to Shotaro Ishinomori, Toei Company, Kinoko Nasu, Takashi Takeuchi, Type-Moon and Aniplex

Quartzer 2

2004: The Team up

Sougo POV

As we go back to Fuyuki, Japan

Year 2004

As we turn our attention to our heroes, we saw that Ritsuka and his group are now recovering from their confusion. With them started to calm down, Ritsuka saying, "Kamen Riders? As in those urban legends I've been hearing about?"

Zi-O then giggled and replied, "Do we look like Urban Legends to you?"

Olga and Mash are now confused at this with Mash asking, "Umm... Master who are these people?"

"Oh, right." Ritsuka then explain to the two about the Kamen Riders, which caused the two to marvel at this. Olga then asked, "So, who are you? And why are you all here?"

"Oh yeah, we forgot about that! But you must also introduce yourselves too." Build said. from which the Chaldea group also nodded.

The Riders then each revealed their names with the Chaldea also introducing themselves and their organization and their systems, which causes the Time Riders, Ghost, Build, Wizard and Den-O to be surprised that theirs another group of Time Travelers with Ghost and Wizard in particular was amazed at how master-servant system and the concept of Heroic Spirits just like how the Eyecon System works. The Riders then explained, "Well, as for why we are here, we are here to investigate a disruption in the Time Stream. Any idea of what that might be?"

Mash then said, "Oh right, I was about to explain to the director, this is Singularity F. Fuyuki 2004. It may be hard to believe but I..."

"I see so you call this Disruption a Singularity, huh?" Woz and Decade said. They then asked, "Then what's causing all of this?"

Mash then explained about the current situation of the timeline which shocks the Riders.

"You mean the world's gonna end in one year?" Build asked.

"Man, that is messed up!' Tsukuyomi stated.

"Yes, that's why we are here." Mash answered.

Suddenly Olga interrupted by asking, "You're a Demi-Servant, right? I could tell just by looking at you. What I want to know is why didn't it succeed until now!"

"Demi-Servant?" Zi-O, Geiz and Wizard said.

"I'm sure you know that Chaldea prepared a servant beforehand in order to resolve the investigation of Singularity F." This caused Olga to gasp Mash then continued, "Right before I died, he offered me a contract. In exchange of a Heroic spirit and a Noble Phantasm, he wanted me to eliminate the cause of this Singularity. So, I merged with the Servant to become a Demi-Servant."

This explanation amazed the others, with Olga replied, "Then this abstitute Commoner has become your master?"

"Master?" Ritsuka muttered as he realizes that they were talking about him, "I am a Master? But..."

"That Command Spell proves it."

"Well, if what Olga-san saying is true... You're going to have to deal with it." Build said. This caused Ritsuka to laugh nervously, when suddenly they heard a ringing in the latter's wrist. Ritsuka then checks his wrist and saw that the band that was wrap around it was blinking and then generates an image of Roman with the latter saying.

"I finally got through. Hello... Can you hear me?"

"Dr. Roman!?"

"Fujimaru-kun, Mash. So, you did get caught up in that Rayshift without being in a coffin you had to withstand the conscious... Wait! Who are these people!" Roman shouted as he pointed at the Kamen Riders. This caused Zi-O to walk and said.

"Oh sorry, forgot to introduce ourselves." Zi-O then each introduced their Kamen Rider names and real names as well as to why they are here to Roman.

"Kamen... Rider?!"

(Cue Opening Theme: Over Quartzer by Shuta Sueyoshi Ft ISSA)

The 'Grand Order' it is the name of the quest to save Humanity from its destruction. Now it's time for the Kamen Riders and Chaldea to complete this quest. Now it's time to take back our future!

Oh, yeah, Oh...

We saw Mash, Ritsuka, Roman, Da Vinci look and marveled at the Rider kicking Kamen Riders, when suddenly they saw Zi-O, Den O, Ghost, Build, Wizard and Decade walking as their faces are now shown.

sshun de tsukamitoru no sa Are you ready? (Are you lazy?)

We saw Sougo, Ryotaro and Ritsuka look at the clocks as they reach it, they then swing their arms the background starts rotating.

Atarashī rekishi wa soko ni Feel it! Feel it! (Crazy baby!)

We then saw Geiz throws his cloak as he transforms to Kamen Rider Geiz.

Feel it! Feel it! (Crazy baby!)

With Tsukuyomi and Mash walking as Tsukuyomi changes to Kamen Rider Tsukuyomi.

Hikari wo kate ni kasokushite

We then cut to Sougo and Tsukasa who then transform to Oma Zi-O and Decade Violent Emotions as their eyes turn red and slanted.

Konomama Shout it out! Shout it out!

We then saw Takeru appear with Makoto, Alain as well as the Heroes of history. With Roman, Sento, Haruto and Da Vinci at mission control

Ima wo susume yō

We then saw Woz turning his book as it shows a shadowy figure with white hair and black eyes.

Madō hi mo Ikudo tonaku Asu no tobira

We then saw the Shadowy figure as he walks, as an image shows the Heroes doing their daily routine. As we cut to Woz's book showing Oma Zi-O destroying things as well as the Shadowy figure sending creating golden cups.

tatake

As it changes to a white version of Woz. As we saw the Ridewatches.

Mitsumeta sono saki ni

We then saw the statues of the Riders appearing as Geiz activates his Ridewatch.

Tobikonde mitara

As the statues continue to appear, as Sougo activates his watch with Ritsuka, Tsukasa, Takeru and Ryotaro watching him.

Believe Yourself!

Sougo, Tsukasa, Ryotaro and Takeru transforms into their Rider Forms.

Toki no ame Surinukete Tomo ni

We then saw the Riders riding their backs, as Shadowy figures started walking. As the Rider kicks started moving.

You, Over "Quartzer"

We then saw Zi-O riding through the blaze.

Mirai wo koe yō

We then saw heroes standing with serious looks on their eyes.

Kako no ishi wa Uso de wa azamuke nai

We then saw the Riders as well as the Servants fighting some enemies. With Woz using his Kamen Rider Ginga Miridewatch.

Kanjiro sō Nexus Future

We then saw Tsukuyomi and Mash walking down the stairs, as the scenery started changing.

Now, Over "Quartzer"

We then saw Zi-O using his sword.

Mabayui sekai Misete

As it switches to Geiz with them duking it out as the title appears.

Ritsuka POV

Going back at Fuyuki, Japan

Year 2004

Roman started to get the gist of why the Riders are here, "So, you're saying that you and your group came here. To also investigate the Singularity?"

"Yes... That's why we're here." Den-O replied.

"Then..."

Suddenly Olga push Ritsuka and Mash out of the way, "Why have you taken control, Romani!?"

"Director!?" your alive?!"

"What are you talking about!? Why is the head of the medical section in that chair?! Where's Lev?"Olga demanded.

"Professor Lev was right in the middle of the explosion. I can't see any hope of his survival."

"No..."

The Riders are now feeling sorry with Olga, although Decade, Woz, Geiz, Build and Wizard felt that something's off. Judging from the tone of Olga's voice This Lev guy should be a capable Mage. Dying from an explosion like that. Is impossible since he had plenty of way to escape.

"The reason I've been entrusted with the operational command is because there isn't anyone left that outranks me."

"Then what about the Master Potentials? What happened to the 47 people who were in the coffins?!" Olga asked.

"All of them are in critical condition."

Olga gritted her teeth as Romani continued, "At this rate..."

"Don't be so foolish!" Olga shouted shocking everyone, "Transfer them to cryopreservation immediately! Our priority is to ensure their survival!"

"I'll do it at once!"

"Director?!"

"As long as they don't die, this can all be justified later." Olga said. she then thought, "I can't possibly carry the burden of 47 lives."

Meanwhile, Back at Chaldea, Antarctica

Year 2018

"Currently Chaldea has lost 80% of all its functions. Once communication with the outside are restored, I'll request supplies and start reconstructing Chaldea. That's the status." Romani stated to Olga while sitting down in the Control Room.

"Fine, Romani Archaman. I'm not happy about it, but until I get back, you're in charge of Chaldea." Olga stated.

"Right, but still..."

As we turn our attention at Fuyuki, Japan

Year 2004

"A Demi-Servant, the fusion of a Heroic Spirit and a Human... I can't believe it succeeded at a time like this."

"Well then, starting now, both Ritsuka Fujimaru and Mash Kyrielight will begin investigation on Singularuty F."

"Hey! Don't you forget about us! We'll help you too! Shiraga-Onna!" Den-O interjected.

"Oh yeah, alongside these people." Olga said with a tone of irritation pointing her finger at the Kamen Riders.

"I wish you luck. But if an emergency comes up, please contact me." Roman replied.

"Hmph! We can send an SOS, but nobody will come to save us." "

"Director."

"Director, are you sure about this? We could wait here for help instead." Mash asked.

"After this incident, I can imagine how much protest we'll get from the Association. We can't go home empty-handed." Olga said as she grips her fist. She then shouted, "Sorry, but you'll have to help me. Mash and Fujimaru. As well as you Kamen Riders!"

"R-Roger!" Ritsuka said

"You got it." Zi-O interjected.

"I never thought the day would come when I'd have to rely on a bunch of commoners." Olga mumbled. Then suddenly they heard a ringing on her wrist. She then activates the communications. And saw that it was Roman, "You're being annoying!"

"Please get away from there now!"

This caused everyone to be surprised, with Mash shouting, "I'm detecting signs of an enemy! This is... A Servant."

"A what now?" Build asked.

Tsukuyomi POV

A few hours later, Fuyuki, Japan

Year 2004

"What the heck!? How did a Servant get here!" Ritsuka asked. As he and the others ran.

"Yeah why?!" Wizard asked.

"It's a Holy Grail War!"

"What do you mean by 'Holy Grail War', Mash-san?!" Ghost asked.

"Yeah it's like the cup that Jesus Christ had on the Last Supper!" Geiz said.

"It's been confirmed that in 2004, a special Ritual called a 'Holy Grail War' took place in this city. A Holy Grail is a vessel that contains the foundation of all of magic. But unlike the Holy Grail that you know, It's A Grail that was completed by the Mages of this City. They summon Seven Heroic Spirits to activate it. The Seven Masters battled it out, and in the end the Survivor gets the Holy Grail.

"Wait a minute, this is just like the Rider Fight that Kamen Rider Ryuki experienced." Decade and Woz said.

"Well I don't know about what you're talking about... But let's get back at the topic in the end the conclusion isn't recorded."

"Did the Ritual succeeded?"

"Did it fail?"

"Whatever did happen, the Servants' actions ended without anyone knowing about them."

As they ran towards a bridge, Ritsuka asked, "But then why?!" Suddenly Fou cried out as if he senses that something wrong, they stopped and saw that the bridge was now tangled with chains. Ritsuka then walk and tried to touch, "Are these chains?!"

"NO DON'T TOUCH IT!" Olga shouted.

"Olga-san is right Ritsuka! Those are no ordinary chains!" Wizard said. As he senses Mana coursing through those chains. When suddenly the chains started moving, which causes him to stumble to the ground. Mash walking towards him.

"Master!"

"What was that just now?!" Tsukuyomi muttered.

"Too bad. The Fresh prey got away."

"Who's there!' Ghost and Zi-O shouted first. The group then turn to the direction and saw a cloaked woman with lavender and is wearing a black bodysuit and a hood. On her hand was a scythe, "An unknown Servant and an Unknown Master. How young and fresh."

"Oh man, this is giving me Medusa Vibes." Wizard said as he pulls out a gun-sword from a magic circle.

"Yeah, and it looks like she's itching for a fight" Den-O said preparing his sword. With the other Riders following suit.

"A Servant! But I don't see her Master..." Mash shouted.

"This world has already gone mad!" Olga said as she prepares to shoot, "A servant without a Master doesn't surprise me."

"So, this means that Servants cannot disappear anymore?" Ghost asked.

"I'm afraid so.' Olga answered.

"Yeesh, now I'm getting nervous." Build shivered as she looks at the woman. They then saw the woman go towards a statue as she scratches its face.

"Those are..."

"Former Humans... Looks like that Servant turned them to stone."

This caused the Riders and the others to be shocked with Wizard snarking, "Great... Now the Medusa vibes are now stronger in this one."

"Why would you do this?" Ritsuka asked.

"I agree with Fujimaru-san here!" Ghost shouted.

"You complain, when you wander into my hunting ground, I'm free to treat however I please, am I not." She then rips the head off causing blood to come out, with the heroes flinching Den-O exclaimed, "That Hebi-Onna is so crazy!"

"You're not wrong there." Build and Geiz replied.

"I've lost one statue, but now I'm going to have twelve new ones." She licks her lips.

"Our option is to fight."

"Fight?"

"Can you take her?"

"Yes!"

"Wait! You're not going to fight her alone!" Tsukuyomi said as she accompanied Mash. With the other Riders watching from the sidelines.

"You're helping me, Tsukuyomi-san?"

"Of course, I do, I can't just leave you to fight this woman alone."

"I appreciate that." Mash smiled

"Be careful Tsukuyomi!" Zi-O shouted.

"Oh, how bold. How fresh. Is this your first time fighting as a Servant? Then as your Senpai I'll teach you." She declared as she twirled her Scythe, "Be careful of what you two say and do. For once the word 'Fight' passes your lips, it has already begun." She then disappears and starts attacking Mash and Tsukuyomi. She starts by trying to break Mash's Shield as well as parrying and dodging Tsukuyomi's sword strikes, "You two are getting desperate. Excellent. But be careful you two, my lance is the lance of immortal killing. Any wounds this lance delivers cannot be healed by any means."

Tsukuyomi then tries to roundhouse kick the woman only for the latter to dodged, "Even if by a miracle that you two could completely heal your body. Do you two understand!?" The woman is now getting the two slid nearly off to the ground. With the former getting ready, "If you make the slightest error..." She then clashes hos scythe with the sword and shield of Mash and Tsukuyomi while saying with glee, "You two will be a failure of a Servant and a Human for the rest of your life!"

The woman tries to slice the two only for them to dodged with Mash ramming and Tsukuyomi kicking the Woman who blocked it. the latter then jumps and goes to the chains, standing at them without falling, "Being too fresh can grate on the nerves."

"Man, you talk too much!" Tsukuyomi shouted.

The Woman then unleashes her hair which turn from snakes to chains which blocked any exits with Build saying, "We're trapped!"

"I will entangle you all with my hair."

"That clinches it, this Snake is now off her bonkers!" Den-O shouted as he readies his stance. Alongside the others.

"I agree with you on that Momotaros." Decade agreed.

"We're no match for her. Please run Senpai!"

"We'll take care of this!" Tsukuyomi pointed her sword

"Mash."

"Tsukuyomi..." Zi-O interjected.

"You two got guts. A little girl is still a little girl, but you two seem strong. That's why I can't leave you two like this."

"Who are you?"

"Who? Look at me and you'll know. Old friend."

The woman as well as the group turn to the direction of the voice, it was a hooded man with a blue hood and a druid staff. The woman then said, "You... Caster! "The man then removes his hood and it was a man with red eyes and blue hair. The woman asked, "Why do you side with these Wanderers?"

"Huh? Because it's better than being on your side of course!" The man named Caster shouted as he fires fire rune spells at the woman. Causing an explosion that destroys the chains, with the woman backing off from the explosion.

"Thanks, but why did you help us?" Ghost and Wizard asked.

"I'm a Caster Servant. For a certain reason, I consider her an enemy. The enemy of my enemy is not necessary my ally, but for now you can trust me." Caster answered, he then told Mash and Tsukuyomi, "Get in position young ladies. Skills aside, your courage are second to none.'

"Thank you!"

"Got it!"

He then shouted at Ritsuka, "Kid! Are you the master?! Then I'll leave it to you for the commands."

"But..."

"If you call yourself a man, steel yourself!" Caster shouted.

"The Blue hair is right, this is no time to be such a chicken, Ritsuka!" Den-O shouted.

"It'd be a temporary contract, but out of regard for those brave ladies, I'll become your Servant."

"Geez, who is he? The Kame?" Den-O remarked.

Yeah that was what I was asking myself, Momotaros." Ryotaro replied.

"That's fine with me. it means I can kill you earlier than planned. I'll take you while you're still flesh and blood." The Woman sneered as she readies her scythe, she then telepathically used her chains to try and attack Caster who jump but the chains started to follow him. The latter then continuously dodged and blocked the strikes, the Woman tried to attack him with her scythe only for Caster to block it with his Staff. He then goes back to the ground as he steps back to dodge the strikes. As he continues to dodge, he then jumps with the woman taunting, "It's all you can do just to run away! It seems you don't even the time to cast a spell, right?"

Caster step back with the Woman saying, "This is what you get for opening your big mouth. This is what happens when you express your intention." She then shouted as she tries to attack Caster only for him to smile at this and shouted.

YOUNG LADIES!"

Mash and Tsukuyomi then blocked the attack with Caster explaining, "I don't need to chant a spell to cast Runes. Go back to School you Dimwit!" He then cast a Rune that was on the ground that the woman was standing over causing a burst of fire. Caster then cast another barrage of Runes towards the Woman causing her to disappear.

"Amazing!' Wizard said. As he marveled at what happened, "He can use Rune Magic without chanting a spell? Man, this guy must be I shouldn't be surprised since I've seen a lot of Strong Magic Users."

"And, that's one down."

"Thank you, you save us when we are in danger." Mash said

"Yeah, you have our gratitude." Tsukuyomi interjected.

"Well, good work. We were saved because of your support, don't worry about it." Caster replied as he grabs the two by the shoulder, this caused Ritsuka and Zi-O to separate them while saying.

"Hey! Hey! Hey!"

"Yup this guy is just like the kame!" Den-O remarked.

"That's one sexual Harassing old pervert." Olga also remarked.

"I agree with you on that one." Decade, Build and Woz agreed.

"For now, let's ask him about the situation. It seems he's a sane Heroic Spirit." Roman said.

"Is that Communication through Magecraft?

"It's a pleasure to meet you. Heroic Spirit, I don't where you hail from but it's an honor..."

There is no need to be so florid. Just state your business quickly. You good at that weakling-man?"

"Weakling?"

This caused the other Riders to facepalm with Build saying, "Wow! He got roasted."

Author's Notes:

And that's about you guys! I hope you have a fun time reading this! And also I'm planning to have Tsukuyomi and Mash to have a sisterly bond with each other since they are pretty much the main girls of their series.