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"Hey, Old man, is it a definite fact that Oni-chan has been gone once in 400 years?"

　Hannah asked the old man one day in Horai Island.

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<"Yes, that's true. After all, the Master (My Lord) himself said so after his return from 400 years later.

"That's right. ......"

　Hannah is thinking about something.

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　It is the year 3467 and Hannah is 19 years old. She has changed from a beautiful girl to a beautiful woman.

　Reiko looks at Hanna and says that she looks just like her predecessor, Adriana Barbora Zetsi.

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"It is possible to send things to the future, isn't it?"

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　<
　But what Hanna is thinking of is a transfer beyond time.

　Hanna likes to think about this kind of theory more than the realization of it.

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　Perhaps because she was surrounded by many practitioners, or rather, all practitioners, Hanna was developing into a scholar who preferred to develop her theories.

"Well, that's not quite right. ......"

　The time capsule-like future transfer was very different from what Hanna was looking for.

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"I want to find a reversible ...... way to ...... develop that possibility."

<

　In this case, the "Mere Old Man" interpreted that reversibility means <> as opposed to <>.

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　In other words, Hannah is trying to transcend time.

"...... impossible?"

<"No, Hannah, the Master (My Lord) has returned from the future, that's what it means.

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　That means there must be some way. In the future, perhaps the old lord has made a move and Jin has come back to the original time.

　And perhaps the research that Hanna is now doing is the way to send Jin back to the original world after 400 years, the old man believed.

　He had to somehow manage to handle <> freely ...... to a certain extent.

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"Well, I can handle a little bit of <>, but it's still not enough..."

　Hannah tilted her head cutely.

"The hardest part is the destination. It's like shooting an arrow at a tiny little island in the infinitely wide ocean of the <>. ...... It might be even more difficult."

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　And it was the old man who gave the advice.


"What?　What is it, Mr. Mere Old Man?

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　Hannah, thinking that the old man's words must be true, gave up her thought and listened to him.

<
"Oh, ......"

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　Jin had brought back a white, blue, and red stone the size of a walnut from the other world, thinking it would be a good souvenir.

　The old man said that they emitted <> and could be <> if the right means were found.

<

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"No, it won't!"

　Just being able to identify the <> is a big step forward, Hannah said.

"Now we just need to figure out the time frame... ......."

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<
　At that time, the sub-free ether wave should have ceased to exist.

　In other words, it is not a > with infinite length, but its other end is interrupted.

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　The break is the time when Jin left 400 years later.

What?　But then, the stone is there <>, isn't it?

<

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"So, the stone was duplicated for a certain period of time after 400 years?"

"So, was the stone duplicated for a certain period of time after 400 years? Another possibility is that the stone collapsed and disappeared during the 400 years and was not duplicated when the Master (My Lord) appeared 400 years later. I think it is possible that the Master (My Lord) did not duplicate it when he appeared 400 years later.

"Hmmm ......"

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　In any case, there would be a discontinuity, Hanna concluded for the time being.

"Yes, but it's still a much easier target."

　Hannah let out a small sigh of relief.

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　The old man was also happy that Hannah's research had gained momentum.

　After all, in 400 years, the old man has to send Jin back to the past.

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　The knowledge that Jin has gained in the other world is still insufficient for that purpose.

　The knowledge that Jin has obtained in the other world has been transcribed, but it is so far away from the laws of our world that we cannot find any connection with it.

()

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　In order to solve the problem in the limited time of 400 years, the cooperation of Hanna, who has rare intelligence, is indispensable, the old man thinks.

　And this is confirmed by the returning Jin.

　<.

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* * * *

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　And today, Hanna was conducting an experiment again.

　Since Jin is away in Leuthart, she has built a sub-free ether wave generator with the help of <> and the craftsmen.

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　We have made something similar a while ago, but this is much smaller and more precise in operation. It should be .......

　Anyway, nothing can be done if it cannot generate and receive <> at will.

　Hannah's (and the old man's) research has just begun.

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"Well, if we can't control and receive this as we want, <> is a dream come true. ......"



　> is what Hanna is referring to when she talks about how to control the automata she has been working on for the past few days.

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　<
　An automata that can be more integrated than the current doppelganger.

　Or a that can transfer <>.

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　This was also a technology that Hanna was searching for along with <>.

　Not to prolong her life by transferring her knowledge to an automata like <600012>, who once opposed Jin, but to be able to with her own will. Hanna aims to be able to < back to the world by her own will.

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"Oh, there are so many things I want to do, and my time is limited. ......

　Hanna laments.

　Then, Jin came back from Loisart.

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"What's the matter, Hannah?

"Oh, honey!"

　Even though she is 19 years old, Hannah still calls him "Onii-chan".

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"You know, I have a lot of things I want to do, but I was worried that my time is limited.

　Hannah is honest with Jin.

"These days I wish I had more than one person.

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　Jin laughed at her as she said this.

Hanna laughed at him and said, "Haha, that's just like Hanna. ...... If you split into several people and have different experiences, it won't be anymore, will it?"

"Huh?"

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　For a moment, Hanna did not understand what Jin was saying, but then she understood what he meant.

"Well, I don't know if that's true.　...... but that's a philosophical question about what I am and what the ego is, isn't it?"

"Well, yes.

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"Well, yes. I think that if a person has the elements that ...... others recognize him or her as that person, then he or she is that person."

"What?"

　Now Jin took some time to understand.

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"Hmmm......... I see. That's an interesting way of looking at it.

　Hannah added to Jin's admiration.

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"You sometimes modify what you made, don't you, Onii-chan?　Then you would understand, wouldn't you?

"...... Oh."

　Jin also realized what Hannah had said.

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　For example, Reiko. From skeleton to muscles to skin, she has been completely renewed, but Reiko is still Reiko.

　Then, what makes her Reiko?

　For example, if we make a copy of the same automata including <, is it also Reiko?

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"...... I still think this is going to be a philosophical discussion."

　Chuckling, Jin recalls a past incident.

"...... Come to think of it, <<600012>>, both old and new << I remember that the old and new <<600012> recognized each other as <<600012>."

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　In the end, Jin came to a tentative conclusion that it depends on how the third party perceives the situation.