"I see, what a powerful force, even though it's not a Master or a Servant, but this power really can't be left alone. 」

"Did your master send you?"

Turning around, Shirou looked directly at the Assassin who suddenly appeared in front of him and asked, ready to fight at any time. Without any reply, the skull-masked Assassin stepped forward with a knife in hand.

"Trace.On!"

Blue lightning flowed through Shirou's arms, forming a black and white sword with the blue points of light. Armed with Aiji's sword, Emiya Shirou blocked Assassin's knife with the blade of his sword, while the white sword in his right hand slashed diagonally towards his elbow.

Is it really worthy of being an Assassin? The agility of the body is naturally extraordinary. After decisively dropping the knife to avoid Shirou's attack, the Assassin's body leaned back ninety degrees like a noodle as softly as a noodle, and then bounced up like a spring, holding the knife that had not yet landed in a swoop.

In the face of the Assassin's onslaught, Shirou took a few steps back in a row to dodge, found the right time, and quickly launched a counterattack. I saw Shirou cross the left and right two diagonal slashes, and directly threw the double sword out.

The Assassin's extremely agile movements are difficult to fathom, and if you want to successfully kill him, you must block his path of movement and create a situation that cannot be avoided.

The black and white swords swirled out and knocked the knife in the Assassin's hand flying away. The azure streamer once again formed a black and white twin sword in Shirou's hand, and Shirou threw it again without hesitation. The twin swords that Shirou had thrown earlier also flew back in a circle, creating four swords flying from four directions, sealing all his escape routes.

It's good, just block his actions like this, but it's not enough, then I'll solve it next.

"TraceOn!!!"

The twin swords that came out with the projection of the blue light were extended into long swords, and in the face of the Assassin who could not be avoided, Emiya Shirou stepped forward and performed a jump slash. The two long swords in the hands of the figure that jumped high slashed down with the four swords that circled over. The slash formed by the overlapping three 'X' shapes fell on the Assassin, who could not dodge.

Blood splattered out, and the body fell heavily, lifeless.

"It's a powerful blow to be human, but are you really human?"

Although the Assassin had been killed, his voice sounded from all directions again, and Shirou, who was frowning at the words, watched vigilantly around him.

"Sure enough, is it a Servant with the ability to clone?"

In the face of the vigilant Emiya Shirou, the Assassin neither showed up nor spoken, and said.

"This is what my master has conveyed to you on my behalf, go to the castle in Einzberen on the outskirts, or the androids of Einzberen will die......

The Assassin's voice faded away, and finally disappeared completely. The twin swords in his hands turned into a blue light mist and dissipated, without the slightest hesitation, Shirou looked up in the direction of the castle of Einzberen on the outskirts, needless to say, Shirou's meaning could not be more obvious.

"Brother!"

At this moment, Illya's voice sounded from behind her, and when she looked back, she saw Illya flying from the sky with Miyu, and Illya smiled happily and waved her arms at herself. Seeing this scene, Shirou also smiled.

"He's ......!!!?"

Seeing Shirou on the roof of a tall building, Miyu's pupils contracted violently and her eyes widened. Illya, who didn't notice anything unusual about Miyu, fell in front of Shirou.

"Brother, let me introduce you, she came here with me for Miyu. 」

「…… Hello, my name is Miyu Edfeldt!"

"Edfeldt?"

Hearing this, Shirou couldn't help but look at Miyu carefully. Is it her sister?

When Shirou thought like this, Meiyu, who was being looked at by Shirou, couldn't help but blush a little and looked away.

"That...... That ......."

"Ah, hello, my name is Emiya Shirou!"

Shirou, who finally reacted, also introduced himself. Hearing this, Meiyou was stunned for a moment, and then bit her lip with a somewhat gloomy face, probably thinking of something bad.

"Brother. 」

Illya, who was on the side, suddenly ran between the two of them, pouting and staring at Shirou.

"You are not allowed to swim against the United States. 」

"How is that possible?"

Shirou, who was taken aback, retorted loudly at Illya's remarks, and then asked as if he suddenly realized something.

"Speaking of Illya, why do you keep calling me brother since we met?"

Although Illya also called Shirou big brother during the Fifth Holy Grail War, the brother that Illya called in front of her felt a little different from that time, and she couldn't say it specifically, as if she was used to it.

"What's the matter, brother...... Don't you like it?"

Hearing Shirou's question, Illya suddenly said with some loss. Seeing this, Shirou hurriedly explained.

"Well, no, it's just a little curious, you can call it whatever you like. 」

"Yes!"

Illya replied as if pleased. It's really incomprehensible! Just as Shirou thought so, he suddenly realized. Miyu opened her mouth as if she wanted to say something.

"That...... I can call you brother as well...... Is it?"

Miyu blushed and whispered her request, and when she heard this, Shirou smiled.

"Absolutely. 」

Hearing this, Meiyou also showed a happy smile. Looking at the happy smiles of the two people in front of him, Shirou turned around and said.

"Alright, let's go. 」

"Brother, where are you going?"

"To the castle of Einzberen!"

"Alas?!!!"

……