Use FGO to open the second dimension

As she spoke, Remlia glanced at Koizumi carefully. Although she had long been accustomed to Koizumi's mysteriousness, to be honest, seeing Koizumi constantly using new methods made Remlia curious.

Where on earth did this guy come from? How did he have so many tricks? And what exactly was the contract between him and him like? Was it just a normal contract between a Servant and a Master? No, Ritsuka and Mashu weren't like this!

"I'm fine..." Koizumi smiled faintly, but his eyes kept glancing at his hands.

What was going on with me? I had inexplicably used the power of a young lady. Was this really a contract?

But now was clearly not the time to dwell on these matters. Koizumi and the others followed Cu Chulainn deep into the caverns, where a large, open-air cavity lay.

"This is the Greater Holy Grail. Isn't this a super-high-level magic core? Why would an island nation in the Far East have something like this..."

Olga Marie, who saw the scene above the open sky hole, couldn't help but say with a look of shock.

I saw that in the high sky outside the cave, there was something like a black hole. But it did not swallow everything around it like a black hole. Instead, endless black mud flowed out from the dark and deep hole like a black hole, forming a huge black mud waterfall between heaven and earth.

The black mud poured down like magma from a volcano, turning everything into scorched earth wherever it passed. It was obvious that the source that ignited the entire Fuyuki City was this thing.

"According to the information, this was created by an alchemist named Einzbern. They don't belong to the Magic Association, and seem to be a group composed only of androids." Dr. Roman found the information recorded in Chaldea and explained to everyone.

"Okay, let's stop here. We've been discovered by that guy."

Cu Chulainn looked solemnly at a place under the black mud waterfall.

Gu Quan and the others looked over and saw a petite figure standing in the center of the open sky cave.

She looked about the same age as Mashu, with golden hair tied up behind her head and a delicate and pretty face, but her golden pupils seemed indifferent and ruthless. The black knight skirt and armor with some blood-colored patterns, coupled with the astonishingly dense and high-quality magic mist surrounding her, made her look like a demon king who had descended into the world.

Koizumi and the others were slightly startled, especially Mashu and the others. After all, Koizumi had lost his memory. Even if Koizumi knew about these things before, he would have forgotten them long ago due to his memory loss. Therefore, Koizumi did not know about King Arthur's affairs.

"...Such powerful magic... Is she really King Arthur...?" Mashu couldn't help but exclaimed in amazement.

At the same time, when Mashu saw that the legendary King Arthur was actually a girl who looked about the same age as her, she couldn't help but feel a little suspicious. After all, in the legend, King Arthur was a male.

Even Remlia couldn't help but be surprised. King Arthur being a woman was not a funny joke.

"That's right. She seems to have undergone some kind of mutation, but she is Arthur, King of Britain and wielder of the Holy Sword. While her gender is different from the legend, there must be some reason for her to appear in male attire in Camelot. Think about it, if she weren't a man, she couldn't ascend the throne, right? There must be some hidden reason for her to disguise herself as a man. It must have been the court magician's bad idea. Actually, folklore does mention that Merlin's interests were truly terrible."

Dr. Roman couldn't help but say this, and Koizumi couldn't help but glance at him.

How do you know so much...

"Huh...? Oh, really. She's a woman. I thought she was a man." Mashu said in surprise.

"Don't underestimate her just because she looks thin. That guy is a super powerful monster that uses magic power instead of flesh and blood to generate impact." Cu Chulainn said in a deep voice.

He had fought face to face with King Arthur and had personally experienced the other party's terrifying strength.

"Each blow is incredibly heavy. If you're not careful, your upper body will be torn apart from your lower body."

"It's like a personified rocket... I understand. I'll fight with all my might."

Mashu nodded seriously.

"Yes. If we defeat her, the changes in this city will disappear. She and I will disappear without exception. After that, it's your job. I don't know what will happen, but please do your best within your ability."

Cu Chulainn said in a deep voice.

"So—just defeat her, right? Don't waste time on something so simple!"

Remlia said this, pointing Gungnir in her hand directly at the other party.

"Two very interesting servants have arrived." Suddenly, King Arthur, who was guarding the basin, spoke, and her eyes fell on Remlia and Mashu, but more on Mashu.

However, Koizumi noticed that King Arthur's gaze was more focused on Mash's shield.

"What!? You can actually speak!? Were you pretending to be silent before?!"

Cu Chulainn was immediately surprised. When he was fighting with the opponent, the opponent was silent most of the time. He thought that the opponent had no so-called self-awareness at all, but he didn't expect that this was all pretended by the opponent.

"Because my every word and action is always under surveillance. So I did the opposite and chose to stand here silently like a scarecrow." As he said this, King Arthur's eyes focused on Mashu's shield.

"But it's interesting. That Noble Phantasm is indeed interesting."

After saying this, King Arthur pointed the holy sword in his hand at Mashu in front of him.

"Get ready, unknown girl. Let this sword confirm whether your defense is truly impenetrable!"

"You—are you ignoring me?"

The corners of Remlia's mouth twitched fiercely, and countless crossroads suddenly appeared on her forehead.

King Arthur glanced at Remlia in front of him calmly and spoke softly.

"Inhuman being, I am not your enemy now, and you should not fight me here!"

"Huh?" Remlia frowned slightly, a hint of doubt flashing in her eyes.

The next moment, flames that seemed to fall from the sky turned into sharp blades and swung towards Remlia.

Remlia reacted instantly, holding Gungnir horizontally in front of her chest, and the air waves spread out in all directions. Mash protected Olga Marie and Ritsuka, while Cu Chulainn protected Koizumi behind him.

With just one sword strike, Remlia was knocked away.

However, Remlia's face was not filled with anger, but more with disbelief.

"how so……"

Slowly, a blood-red little girl holding an ominous flaming sword appeared in front of Remlia.

It was an extremely cute figure, so cute that people just wanted to love it, but the smell of blood on its body was extremely strong.

She has deep crimson eyes, and her clothing is also crimson. She wears a short-sleeved shirt and miniskirt, with a yellow tie adorning her chest. She also has a pair of unique wings on her back, adorned with colorful crystals. Unlike Remlia, who wears pink clothes and light blue hair, this blonde girl's outfit emphasizes red throughout.

Such a familiar figure made Remlia's hand, which was holding Gungnir, almost tremble.

"How sad! Because of you and your Master's existence, her summoning became possible..."

"Possibility is a trick of the imagination."

After King Arthur sighed like this, his eyes focused on Mashu in front of him.

Mashu and the others looked at Remlia in front of them with confusion, but then again, this Servant who just appeared looked like Remlia.

"Why...why are you here!?"

"——Flan!"

Chapter 9 Matthew and King Arthur

"What... is going on?" Mashu looked at the scene in a daze, she seemed to have no reaction at all.

After all, this is true. Remlia in front of her is the strongest combat force on her side, but suddenly a person who seems to be stronger than her appears, which makes Mashu unable to react at all for a while. Something is wrong!

"It seems that the little girl who just appeared has some relationship with that Lancer, otherwise, Lancer would not have such an expression." Cu Chulainn looked at the other party solemnly, with a heavy color flashing in his eyes.

The little girl who had just appeared in front of him gave him a very dangerous feeling. If he dared to approach her, he would probably die miserably. To be honest, apart from his master, this was the first time he felt such a threatening force.

"It's the eldest lady's younger sister..." Koizumi said subconsciously, but the next moment, he realized what was going on.

Strange? How do I know this? Did the eldest lady tell me about this?

"I see. My sister was summoned and became my enemy, so this is why she's like this? This is really..."

Cu Chulainn just sighed and didn't say anything. Although this kind of thing was rare in the Holy Grail War, it did happen. After all, the Holy Grail summoned those who had the idea of ​​making a wish to the Holy Grail. If they encountered this kind of situation, they could only say that God was playing a trick on them.

"Fighting with your own family... I don't have this kind of experience, but it is definitely painful."

Mashu couldn't help but say in a dull voice, and Ritsuka couldn't help but nodded, but——

Olga Marie's head was full of black lines. She pointed her right hand at King Arthur in front of her and said speechlessly.

"Can you guys please clarify the situation for me? We're in a battle! There's a King Arthur right in front of us!!!!"

Cu Chulainn and the others were startled and quickly looked at King Arthur, who also had a complicated expression on his face.

It really does make me feel uncomfortable when I’m ignored... Is my sense of existence very low?

King Arthur couldn't help but ask this in his heart, but then he couldn't help but sneer. Are you still concerned about such things at this time?

"Come! The Son of Light of Ireland and—the unknown girl!"

As soon as he finished speaking, waves of air suddenly surged under King Arthur's feet, as if he was taking steps weighing a thousand pounds towards Mashu and Cu Chulainn. However, to be precise, it was not Cu Chulainn, but Mashu.

Because it was obvious that the person King Arthur cared about the most from the beginning to the end was Mash, and as for Cu Chulainn...

I've fought him before and I know all his tactics, so there's no need to fight him again.

Dealing with Cu Chulainn only requires one Noble Phantasm. If one Noble Phantasm is not enough, just use a few more.

With the Holy Grail as his backup, King Arthur doesn't have to fear the two servants in front of him.

However, even she herself didn't know why, but there was still a glimmer of hope in her heart.

It was as if he was expecting the two Servants in front of him to defeat him... Is that possible?

It turned out to be impossible... King Arthur made such a judgment in his heart.

The black-stained holy sword struck the shield, sending up waves of energy that pushed Mashu back.

At this moment she finally understood what Cu Chulainn said.

——Each blow is incredibly heavy. If you’re not careful, your upper body will be separated from your lower body——

Indeed, with such a heavy attack, if you are not careful, you may be cut in half by the opponent.

Moreover, the opponent has a speed similar to mine. If this continues, I will be no match for him at all.

Just after the fight, Mashu felt all kinds of insecurity in her heart. Could she really defeat such a being?

In an instant, even when King Arthur was about to continue his attack, several dazzling and blazing fireballs came into view. The fireballs were so fast that King Arthur could not dodge them at all.

However, King Arthur also has his own way of dealing with it——

The magical mist formed by extremely dense magic power filled the surroundings of the body, trying to block the fireballs one by one.

"boom--"

Brilliant flames lit up the surroundings. With just this one strike, a weak servant would have perished. However, King Arthur was not one of the weak. He was able to kill a wild beast like Berserker, so he was obviously a strong man.

Gradually, the smoke dissipated, and King Arthur's dark and ominous figure appeared. His cold and murderous face made Cuchulainn and Mash feel more and more stressed. It turned out that King Arthur, who was famous all over the world, was not so easy to kill.

"Tsk... What the hell is this incredibly huge magic power? As a Caster, I don't even have such exaggerated magic power!" Cu Chulainn couldn't help but curl his lips.

"Indeed, this magical power is exaggerated and a bit terrifying..." Mashu said in a deep voice.

The Servant in front of her really brought her too much pressure. She was already very unconfident as a Servant, and now seeing the Servant in front of her, her insecurity was even more obvious.

but--

Mashu glanced behind her at Koizumi, her senior Fujimaru Ritsuka, and Director Olga Marie, who were all paying attention to Remlia. Suddenly, her previous lack of confidence was completely covered by a determined look.

It doesn't matter what happens to me, but as a senior Servant, I still have the Director and Mr. Koizumi to protect me, so I can't fall here no matter what, no matter what!

As if seeing the determination in Mash's eyes, King Arthur slowly began to be enveloped by magic power. At the same time, he slowly raised his holy sword with both hands. "I will use this to respond to your blazing eyes... to respond to your desire to protect the Master!"

"This magic power... is a treasure!" Olga Marie's face suddenly changed, and Fujimaru Ritsuka couldn't help but grit his teeth.

Cu Chulainn's expression hardened, and he retreated slightly to the rear, not wanting to retreat, but rather -

Mashu was at the forefront, feeling the magic power in front of her while recalling the predecessors behind her. The determination in her eyes became stronger. At the same time, the shield in her hand seemed to want to respond to its owner and began to emit a dazzling white light.

"The Iron Hammer of the Humble King, the Aurora Reversal—"

As if to cut through space, the holy sword in King Arthur's hand slashed down in one breath after accumulating full power.

"—Be consumed by the light! [Sword of Promised Victory (Excalibur Morgan)]!!!!"

The moment the sword was swung, a dark and ominous light burst out and rushed towards Mashu as if to devour everything.

Just as King Arthur said, the black aurora before us is enough to swallow up all the light.

but--

"Noble Phantasm, unfold...!"

As soon as the words fell, a dazzling white light emanated from the shield, and a huge shield appeared in front of Mashu.

The dark light hit the shield, but the shield did not shake at all.

Even though Mashu was under extremely strong pressure, she still stood where she was, gritting her teeth and holding on.

“Aa ...

Gradually, the dark light seemed to lose its initial powerful momentum and slowly dissipated.

Mashu couldn't help but breathe slightly, but it was obvious that her shield had blocked the edge of King Arthur's holy sword.

Even now, Mashu still felt a little unreal.