In a dark room full of machines and wires, a person is looking at a recording. The recording shows a black knight fighting with two IS. The figure could only ponder how someone could imitate her creation without her knowing; she had searched all the information about him, but the deeper she looked, the more confused she became. The black knight is just an ordinary person despite the rumor surrounding him. There are several facts that can be known that he always goes abroad during school holidays, especially to England. He is a master in archery and swordsmanship, but how could he have the knowledge to control such energy even though her creation still required complex machinery?

Shamisen ringtone could be heard waking her from her thoughts.
"T-tthis ringtone." She answered the call.
"Yo, yo, hey, hey! HAI!, this everyone idol, Tabane Shinonono here~" The figure who saw the recording was the inventor of IS.
"WAIT, don't close it, Houki Chan!"
"Hello, little sis, Unu, I know what you want; you want private, IS right?"
"Of course I have prepared it for you."
"It has all the best things and more advance from every IS that exists."
"And looks good next to white."
"The IS name is Akatsubaki."

In the city

Shirou was walking after buying what he needed for an educational trip. He saw Ichika with two close acquaintances who were chatting with him even though only the girl spoke before Charlotte dragged him away.
'That kid, I hope he does not get into trouble.' Shirou just can only hope, but knowing Ichika's luck, well, that's not his problem.

In the beach

Shirou is relaxing lying on a beach chair while reading a book (Shirou wears an EMIYA summer costume); he doesn't need to worry about being left behind because they can all relax and enjoy the beach from 11 a.m. until the evening.

uwahh~

Shirou moved his gaze because he heard a voice of admiration. He saw
Near the beach volleyball court, there was Orimura sensei wearing a black bikini.
'damn' Shirou had to admit that she looked good in her bikini. Shirou thought that this educational trip was quite enjoyable because his life as an enforcer from the clock tower meant that he rarely had free time.

Shirou remembers his past, starting from meeting with Kiritsugu in Fuyuki Fire, meeting Taiga, his cheerful guardian sister, studying magecraft with Waver for the first time in the clock tower, learning science to understand IS, the 5th holy grail war, greater grail dismantlement, and until now.

in Kagetsu-sou

Evening arrived, and the students from IS Academy were enjoying the hot springs.
"Ah, man, that hit the spot." Ichika was soaking in the hot spring alone.

sreeek

Ichika heard the sound of the door sliding. He turned around and saw Shirou enter the hot spring area. What surprised Ichika was that Shirou had a strong body, but what surprised him more was how many wounds he had from gunshot wounds, cuts, and cuts, and what made him unable to look away was a large bite wound on the left side that ran across the lower right side of his body, that stretched from the front of his body to his back. How hard was his life that he had so many wounds like that? Ichika could only wonder whether this world was truly peaceful and whether the power he had gained was truly enough to protect someone.

pluk

"Ahh... if you want to ask a question, just ask, kid," Shirou said while submerging himself in the hot water.
"That wound..."
"Ah this, I get this from my job."
"But that large wound..."
"It's just from a beast that can easily murder every human in the world."
"It name?"
"Kid, stop asking; sometimes there are some facts that are better not known; even the inventor of IS and your sister don't know."
"Can I ask the last question? It's not about the secret."
"Sure"
"Can I protect everyone?"
"You can't; it's not because you're weak; that's because it's impossible to save everyone. I understand that you only want your life to have meaning because you have power, but the world will always want more." Ichika is silent while listening.
"However, human life is not a story of death and suffering but a story of love and hope, whether a person is a saint or a criminal."
"Can I survive in this world?" Ichika asks.
"Survive. You just need to keep moving and thinking. Never think about dying or you will stop, but if you want to protect someone, do it even if your life is at stake," Shirou said and started to move away from the hot spring.
"Because in the end everything that is born and created will end."

sreek, plak

Ichika could only be silent and ponder Shirou words until dinner was finished, which earned him strange looks from all the girls he knew.
Ichika walked in the corridor to his and Shirou's room; he still wanted to ask something, but when he got to the room, he didn't see anyone. He felt like meeting his sister because he was confused about what he should do next.

with Chifuyu

She had a lot on her mind because of the events that had recently occurred, like the VT incident with Bodewig IS, even though he had confirmed that it had nothing to do with Tabane, and regarding SAM users, since its combat debut, many leaders from the world's major organizations have wanted this. She can see why they want it, a simple form that has greater energy than standard IS, changing matter into other forms and the ability to manipulate energy, but she is still confused about the first two final movements, moving from one point to another with an instant, and the final technique, a technique using two swords that surpasses human understanding.

knock, knock

"Chifuyu ne, can I enter?" Shifuyu heard her brother call.
"I told you to call me Orimurra sen..what's wrong, Ichika?" She wanted to scold him, but seeing the confused look on his face, she held back his anger.
"I just need talk."
"Come in"
"Thank you, Ne San."
"What's wrong"
"Chifuyu ne, you taught me the weight of a sword that we hold is strength, and strength is used to protect."
"yes"
"But what happens if there are monsters out there that can kill humans without any effort?"
"What do you mean?"
Ichika began to explain what he saw and heard while in the hot springs. "..."
The two of them felt silence. Chifuyu wanted to believe her little brother, but if what Shirou said to Ichika was true, then for what purpose were they born, perfect humans? Now it sounded like a joke.

with Shirou

Shirou was looking up at the stars in the night sky on the terrace, a habit passed down from his father; if anyone passed by and saw him now, they could only feel an aura full of suffocating loneliness that would make weak people commit suicide.

tap, tap, tap, tap

Shirou heard silent footsteps and came closer towards it. There he saw a woman with red-purple eyes and long, dark purple-pink hair that extends to her hips with some loose bangs, which cover her forehead. She wears a frilly maid-like blue and white dress, ribboned tights on her legs, a pair of robotic rabbit ears, a lab coat, and Mary Jane shoes (similar to those in Alice in Wonderland), revealing a great deal of her cleavage. She also wears a gray bracelet on her wrists.
"Who are you?" Shirou ask.

Tabane POV

Hihihi, now that everyone is sleeping, it's time to prepare a surprise to welcome my arrival.
"Who are you?"
She turned around because she was surprised that someone could sneak up behind her.
"Wha-!?" She saw a man with 6.1 feet tall. He has tan-colored skin and white hair, and the most interesting thing is his eyes. It's heterochromia eyes; the right side has color like molten gold, and his left side has gray color like steel. He wears yukata provided by Kagetsu-sou.
end POV

For the first time, creator of IS and creator of SAM meet; one is a researcher and the other is a forger, one from science and the other from mystery—two people from two different sides of the world.