Beta read by someone.

If there was one word that Shirou would describe the situation he was in, it would be confusing.

Because immediately after he summoned his servant (which happened to be Musashi), said servant jumped at him with a hug while calling him 'gramps'. Not to mention the fact that Musashi happened to be a woman as well.

Which left Shirou one question he had in mind: Why did she call him gramps?

"Uhm...excuse me, but I don't know you."

Musashi let out a pout. "What?! You don't remember me?! After what we've been through in Shimousa?!"

That got Shirou even more confused. "Shimousa? What are you talking about? I don't know a place like that."

Upon hearing Shirou's reply, Musashi was about to give Shirou a piece of her mind but Ritsuka decided to intervene. "Um, Musashi. That's not gramps. Believe me."

"Eh?! He's not gramps?! What do you mean by that, Fujimaru-kun?!"

"Well, he's Emiya Shirou, a new master of Chaldea. As for why he looks like gramps…my guess is that he's the host of gramps."

Meanwhile, Shirou was completely dumbfounded by the conversation between the two. "Those two know each other? And why did Ritsuka call me gramps as well? Does it have anything to do with the place 'Shimousa'? And why did he mention 'host'...wait, don't tell me…"

However, his train of thought was cut off as Musashi let go of Shirou when she got up, allowing Shirou to do the same. "Sorry, it seems I mistook you for someone else upon seeing you. My apologies."

"It's fine. I'm glad that we got that misunderstanding out of the way." Shirou replied as he dusted himself off. "So, I assume that both of you know each other then?"

"Yeah. Speaking of which, it's been a while, Fujimaru-kun! How have you've been?"

"Oh. Yeah. Me and Musashi met a while back, during a singularity. Still though, I can't believe you managed to summon a servant that easily on your first time here! And a Saber-class servant nevertheless!"

"Eh? What do you mean by that?"

"Well…let's just say…there are times where I was not lucky in getting a servant…" Ritsuka muttered as he turned his head sideways. "All of those saint quartz…wasted…"

"Um…is there something wrong with Fujimaru-kun?" Musashi asked.

Mash let out a sheepish laugh. "Well…it's a bit complicated. Anyways, welcome to Chaldea, Musashi-san!" she greeted.

"Who are you? A friend of Fujimaru-kun?"

"Y-Yes! I'm Mash Kyrielight, a member of Chaldea."

"I see." she said before looking at Da Vinci. "And I suppose she is a servant as well?"

"Correct! Servant Caster, Leonardo Da Vinci at your service." she greeted. "Now then, since this is your first time here, let's give you a tour of the place!"

"Sure! Let's go, master!"

"Yeah."

Soon, everyone began to leave the room to give Musashi a tour of Chaldea. However, during the tour, Ritsuka could not help notice that she was barely giving any attention to the rooms. Rather, she was staring at Shirou.

"Is there something wrong, Musashi?" Ritsuka asked, noticing her staring towards Shirou.

"Well, it's about my master. You told me that his body is the vessel for gramps…but for some odd reason, I can also feel gramps' presence, although it's really small." she replied.

"Eh? Seriously?" he asked, to which Musash nodded. "Huh, and I thought him coming from another dimension was the big mystery behind him."

That got Musashi surprised even more than before. "Eh?! He came from another dimension as well?!"

"I can hear you two." Shirou interrupted, making them jump. Shirou turned around to see them with a small blush on their faces. Immediately, he let out a sigh. "Listen, about this 'gramps' you two keep mentioning for a while now…I think I may know who you two are talking about."

Immediately, both Ritsuka and Musashi's eyes widened upon hearing Shirou's words. "You do?! How?!"

"Well…it's a long story that I'll explain later after the tour."

Meanwhile, Da Vinci could not help but wonder about Shirou's words. "What does he mean by that?"

(Some time later…)

"And over here is the training room where heroic spirits go to brush up on their skills. This room can also be used for sparring matches as well." Ritsuka said.

Musashi's eyes began to light up. "Really? I get to fight other people here? Like who?" she asked in excitement.

"Well, for example, Sasaki Kojirou-"

"He's here as well?!" she exclaimed, her excitement growing even further than before.

"Y-Yes. You want to fight him?"

"Well, while I would like to fight him, he's not my opponent that I have in mind. Rather…" she said as her gaze went towards Shirou. "Master! Fight me!"

For a moment, nobody said anything before Shirou decided to speak out. "W-What?" Shirou asked.

"Eh?! Musashi-san?! Why?!" Mash asked.

"Because I need to learn more about my master! Aside from the fact that he looks like gramps, I also felt something both familiar and unfamiliar from him! And it's driving me crazy!"

"And…you think the best way is with swords?" Da Vinci asked.

"Yes!"

For a moment, nobody said anything as they were all waiting for the answer Shirou was going to give.

And then...he gave his answer.

"Sure. I'll accept it."

Everyone besides Musashi was surprised with Shirou's answer, while Musashi herself was happy with the outcome.

"Shirou! Are you crazy?! You're going up against Musashi! She's not someone you can beat easily! Even though you may have participated in a Holy Grail War and won, you're still up against a servant! A Saber-class servant nevertheless!" Da Vinci yelled.

"I know…but as her master, it's best to build up trust between us. And…it's about time that I answer Musashi's questions about me and the 'gramps' she has been talking about."

For a moment, nobody said anything until Ritsuka decided to speak up. "Da Vinci, let him do it."

Immediately, she turned to Ritsuka. "Are you sure about this?"

"Relax. It's just a spar. I'm sure there won't be any harmful damage done. Plus, I can call for other servants for backup just in case things go wrong."

Da Vinci was hesitant with both Shirou and Ritsuka's choices, but eventually gave in. "Well…if that is your choice, then I won't stop you."

Soon, the group went into the training room. As they did, both Shirou and Musashi went further into the center of the room while Ritsuka and the others remained on the sidelines.

"Um…Shirou-san, do you need a weapon of some sort? We can give both of you wooden swords for this. Or we can ask Musashi-san to lend you one of her katanas."

"There's no need for that."

For a moment, they were confused with Shirou's words about not needing to borrow one of Musashi's katanas for a practice match. However, they would get their answer immediately.

"Trace on."

To their surprise, a katana immediately appeared in Shirou's hand. For a moment, everyone gasped at the design of the katana itself. The guard was golden and shaped in a circle, a golden blade collar, a white handle with a red diamond pattern in the middle, and the butt cap was golden. However, there was one thing that made it stand out from any other katana.

The blade itself was in a crystal-red color, and it gave off a shine that it looked like it was glowing.

For a short moment, Musashi can not help but admire the craftsmanship and color of the blade itself. However, it also raised more questions for her as well. "What the heck?! My master can summon swords like that?! And that katana…that's clearly a Muramasa blade! How did he manage to find one?! And how is the blade red?!"

"Wow. That is one nice katana Shirou projected." Ritsuka commented. However, when he turned to look at Da Vinci, he saw a look of slight dread on her face. "Da Vinci?"

"Fujimaru-kun…I don't know why…but that weapon Shirou just projected feels…odd."

"Odd? What do you mean?"

"That's what I want to know."

"Emiya-san, good luck!"

Shortly afterwards, Shirou proceeded to position himself into a hanging stance with both of his arms holding onto his Muramasa blade while his body was sideways; his head facing Musashi.

At that moment, Musashi could not help but feel a sense of both dread and excitement from seeing Shirou's stance. "That posture…I can't find an opening to exploit! Looks like this will be an interesting fight!" she thought to herself as she drew out her katanas and proceeded to position herself into a dual-wielding stance.

For a moment, the two did nothing but stare at each other.

And then, the two lunged at each other, their blades clashing…

Arturia was walking down a hallway, minding her own business. "Hmm…today is the day Shirou summons his servant…I wonder who he summoned? Perhaps a Saber like me? Or possibly a different class? Or maybe…another me?" Immediately she coughed at the last idea. However, as she was walking, she heard sounds of blades clashing each other. "Hm? This sound…is that the sound of a fight? Who? And in this direction…is it from the training room?"

Wanting to know, she went towards the direction of the sounds. As she got closer, she noticed that the sounds were coming from the training room, just as she thought before. Eventually, she reached the entrance, and what she saw completely shocked her.

In front of her was Shirou and Musashi, who were trading blows with their weapons. Each time their blades clashed released sounds that were pleasing to people who used swords. Not only that, but their swordsmanship was captivating to her.

"So, you're here, Saber."

Upon hearing the voice, Arturia turned and to her surprise, saw a massive group of people which consisted of Ishtar, Parvati, Sitonai and her bear, Astraea, Irisviel, EMIYA, Cu, Medusa, Sasaki, Medea, Ritsuka, Mash, and Da Vinci. "Eh? All of you came here?"

"Yeah. Or to be precise, me, Fujimaru-kun, and Mash were already here because of Musashi's request first before everyone else came here at different times." Da Vinci said.

"Musashi?"

"Shirou's servant and just like you, she's a Saber-class servant."

Arturia's eyes widened. "Shirou's servant?! Her?!" she asked, to which Ritsuka nodded in reply. For a moment, Arturia stared at the fight between Shirou and Musashi. Immediately, she was amazed not only by the fight between them, but how Shirou was able to keep up with Musashi. "Shirou…just what did you do to reach this level of strength?" she thought to herself, impressed with his growth. However, as she continued to watch the fight, a part of her could not help but feel a little jealous of Musashi. "Musashi…you better protect my former master…" Immediately, she discarded that thought before turning to Ritsuka again. "Master, how long has this fight been going on?"

"Well…it's been going on for 15 minutes."

Arturia was alarmed at Ritsuka's answer. "15 minutes?!"

"Yeah, which brings me to a question. Was Shirou able to do any of this back in his world?"

Everyone nodded sideways, but Ishtar began to speak up. "Back in Fuyuki, Emiya-kun wasn't even able to do a fraction of what we're seeing right now! Just as he mentioned earlier, he was only able to do projection and reinforcement, not go toe to toe against a servant! I swear, what kind of shit did Emiya-kun get himself into?!" she ranted.

"Ishtar-san, calm down." Parvati said.

"Exactly. Jealousy is an ugly thing, Ishtar. Especially in front of Shero." Astraea said.

At that moment, Ishtar felt like starting another fight against Astraea, but decided to put that aside. "But aren't all of you curious as well?! It's like he's a completely different person!"

"I know, right? I've never seen onii-chan do something like this before." Sitonai said in fascination.

"Archer. Do you know anything about this? I mean, you spent time with him due to your former master, right?" Medusa asked.

"Hey, for once, I'm in the dark about this development." he said. "Is this really my past self? I don't even see a resemblance of what I used to be. In fact, he's using a completely different fighting style from what I remember!" EMIYA thought as he looked at the fight silently. At the same time, he noticed the blade Shirou was using as it was the first time seeing such a blade. For a moment, he could not help but look at it marvelously because of its craftsmanship.

However, when he attempted to read it, he felt a sudden pain in his head, much to his surprise.

Which meant that it is a divine construct.

"You're kidding me! He's using a divine construct?! How did he manage to get one, let alone using one?!"

"Hey, Archer. Are you alright? You look like you're in pain or something." Cu asked.

EMIYA let out a sigh. "It's none of your business."

"So…that's Musashi, my son's servant…she seems interesting! Not to mention how much of a fight they are putting up! Go get her, Shirou!" Irisviel cheered.

For a moment, Ritsuka could have sworn that he felt a chill from some certain servants due to Irisviel's words.

"Hm…that blade…" Medea muttered.

"Hm? Is there something wrong, my former master?" Sasaki asked.

"Well, that blade the boy is holding…I sense something odd from it. It's like…it's something not from this world…"

"Well, it was mentioned that he came from another dimension, which I assume would be his world, so that could explain it." Sasaki replied before looking at the fight again. "I must say, his fighting style is similar to mine, but with a few exceptions."

"Really now?" Cu interrupted. "Hm, when that lady is done over there, it's my turn next. Seeing the kid as of right now is making me itch for a fight against him." he said before turning to EMIYA. "Speaking of which, I heard he can do the same thing as you. Mind explaining that as well?"

EMIYA let out a sigh. "I don't want to talk about it." he said, trying to avoid the conversation.

Back to the fight, both Shirou and Musashi were slightly breathing heavily at how long they have been fighting against each other. Shortly afterwards, both of them went for each other again, ending with a blade lock as their katanas clashed with each other. However, the lock did not last long as they began to separate before swinging and dodging at each other.

"Okay, my master is really strong! I don't know how long it has been since we've started fighting, but I can't find an opening!" Musashi thought to herself as she swung at Shirou. However, he quickly dodged it and did a roundhouse kick at her, slightly surprising everyone in the crowd before quickly swinging at her again.

"Tch, this is quite tough! Then again, I'm fighting against Musashi, a master swordsman…wait, swordswoman in this situation…" Shirou thought as he dodged one of Musashi's swings.

At that moment, their blades clashed once more and the two moved away from each other, creating a gap of distance. Shortly afterwards, Shirou moved forwards and to everyone's surprise, he jumped on the wall before jumping off of it to attack Musashi in the air for a short while. Then he quickly spun around with a swing, forcing Musashi to defend. However, that swing was not the end as he began a relentless frenzy of sword swings, forcing Musashi to block even more than before.

Eventually, Musashi had enough of the relentless barrage, and pushed Shirou back a bit. For a moment, nothing happened.

Then Musashi let out a smirk. "Heh! You're strong, master!"

"So are you, Musashi." Shirou as he relaxed a bit. "Now then…should we end this?"

"Yeah…let's end this!"

And the two began to run towards each other again.

However, a barrage of swords were suddenly thrown between them, causing them to stop. "What the hell?! Who did that?!" Musashi yelled.

"Oh great. It's him…" Shirou thought, knowing who would attempt an act like that.

"Gilgamesh! What are you doing?!" Ritsuka yelled.

"Isn't it obvious? I'm getting rid of that faker there!" Gilgamesh yelled as he pointed at Shirou, to which Musashi stood in front of him protectively.

"Master. This individual over there seems dangerous and wants to kill you. Is he an enemy?" Musashi asked.

"Well…he's Ritsuka's servant." Shirou replied.

"Wait, he's an ally? Then why is he trying to kill you?"

Shirou let out a sigh. "Let's just say he really can't stand me." he said with a sigh before turning to Ritsuka. "Ritsuka, do you mind if I fight him for a bit? I feel like this grudge needs to end…"

"Eh?! Are you sure Shirou?! You just had a fight against Musashi! Now you want to go up against Gilgamesh?! Don't you need some rest first?! Or ask Musashi to support you?!"

"I'll be fine. I'm used to situations like this." he said before turning to Musashi. "Well…Musashi, you're about to get your answer about 'gramps' right now."

Immediately, Musashi's eyes lit up. "Really?!"

"Yeah." he replied before turning to Gilgamesh, who still looked at him angrily. "Really? You're doing this now?"

"Shut up! I won't accept a faker like you as a master of Chaldea! Your presence here is a blight in front of me!" Gilgamesh yelled.

Shirou let out another sigh. "You know, if it's a fight you want…then I'll give it to you. However, right here isn't a good place for it."

"Oh? And how do you plan on doing that?"

Immediately, Shirou held his katana, held it upside down…and stabbed the ground before saying one phrase.

"Manifest, world of my soul…and engulf everything around you."

In an instant, a giant ring of fire appeared around everyone, nearly shocking everyone. "Shirou! This is-?!" Ritsuka asked.

"Now then…welcome…to my world…"

And everything went white…

Ritsuka closed his eyes upon seeing the blinding light around everyone. "What is this light?!" he thought to himself. After a short while, he then opened his eyes…only to see he was in a completely different world.

Unlike the empty training room of Chaldea he saw earlier, the world he was seeing right now was one that looked like it was from a fairy tale. Around everyone was a grassland that looked vibrant with many flowers, a blue sky with a sun, and a nearby river. At the same time however, there were weapons everywhere as his eyes could see, ranging from swords to axes to spears and many more.

However, as he was looking around, he saw something that he did not expect.

The Emiya Residence.

For a moment, Ritsuka could not help but admire the scenery in front of him. "Shirou…what is this?"

Shirou let out a sigh. "This is…my reality marble."

"A reality marble?!" Da Vinci exclaimed.

"Eh?! A reality marble?!" Mash repeated.

"You have got to be kidding me…EMIYA-KUN CAN MANIFEST A REALITY MARBLE AS A HUMAN?!" Ishtar yelled.

"Shero's reality marble?!" Astraea yelled.

"Hold on! Are you saying that he's able to manifest a reality marble?! As a human?!" Ritsuka yelled before turning to Shirou. "Shirou! Do you know what happens when you have a reality marble?!"

Shirou let out a small sigh. "You mean that the Mage's Association will hunt me down for all eternity and will dissect me just for having one? Then yes, I already know about that a long time ago."

Immediately, that caught the attention of everyone. "Wait, what?! Hold on! Are you saying that just because my master has a reality marble, he'll be hunted down by this Association?! What the hell?! That's bullshit!" Musashi yelled.

Astraea let out a deep sigh. "Sadly, that's the truth." she said. "No wonder why I haven't heard from Shero for a long time…"

"Onii-chan has a reality marble…not what I was expecting today." Sitonai muttered.

Arturia then turned to Shirou. "Musashi! Make sure to protect my former master!"

"Y-Yes!"

"What the hell…being hunted forever just for having this? That's not a fate anyone would have…" Cu muttered sadly with the rest of the Fuyuki servants, Musashi, and Irisviel nodding in agreement.

"Hah, a reality marble…just fitting for a faker like you." Gilgamesh sneered. Immediately, everyone turned to him with a sour look on their faces. "What? It's true! This is nothing but a false world composed of that faker's soul, and all I see are just fakes!"

Immediately, everyone was getting annoyed with his taunts towards Shirou. However, what Gilgamesh said next was the last straw.

"This world is a fake, just like you! And you will always be a faker with no self-value!" Gilgamesh yelled/taunted.

At that moment, nearly everyone was about to draw their weapons after hearing that insult…

Only to see a hammer suddenly flying from the Emiya residence…and striking Gilgamesh right in the face. For a moment, everyone was completely stunned at what just transpired.

However, Gilgamesh was not having any of that.

"WHO DARES TO-"

"WHOEVER IS MAKING THAT RACKET, SHUT UP! I CAN'T CONCENTRATE HERE!"

Immediately, everyone was stunned at the voice coming from the residence, especially with how it exactly sounds like Shirou's. "Um…Shirou, who was that? And why did that sound like your voice?" Arturia asked.

"Well-"

"I swear, people these days…" the voice grumbled as the voice revealed itself from the front doors. "Whoever you are, state your business here before I kick all of your asses! Especially you, loud-mouth!" he yelled, clearly showing that he was annoyed.

Upon seeing the man's face, everyone's mouths completely dropped.

Because it was exactly identical to Shirou's face, but slightly older. And he was wearing a different outfit, consisting of him nearly shirtless as on his left arm was a red shroud with markings with a white kimono on his shoulders and his legs were covered with black pants and steel toe boots.

"Well, that's one way to introduce yourself…" Shirou thought. "Everyone. Meet Sengo Muramasa, the demonic blacksmith of Japan…and my ancestor."

For a moment, nobody said anything…until the silence was broken with one question.

"YOUR ANCESTOR?!"