On June 10, Jin visited . He was accompanied only by Reiko. His means of transportation was by .

The purpose of his visit was various, but first he greeted the Chief Superintendent, Tomax Bartmann.

"It's been a while. I understand the is coming up soon."

"Yes, it has been. I'd like to say that it's been so busy that it's making me giddy ......, but Manon is so good that it hasn't been that hard."

"That's good to hear. I would like to check the manon at ......."

Tomax Bartmann was delighted when Jin said, "I heard that you recently had a mock battle.

"Thank you very much for this. It's nice to know that you keep Manon in good shape.

So they rented a small conference room for the overhaul.

The assistant was Reiko.

I could have asked the old man to send the necessary materials from Horai Island, but this time there was no need to do so.

"There is nothing wrong with me.

There was no rattling in the joints, no distortion of the skeleton. There was no deterioration of muscles or skin.

"Thank you, Mr. Jin."

"Thank you, Mr. Jin." "Yes. Keep up the good work.

"Yes, I will."

At this point, Tomax Bartman spoke to Jin.

"By the way, Jin-sama, at the <> we will probably be sending official friendship delegations to the four countries.

Here it comes, Jin thought. He had heard from Manon, via the old man, that such a request had been made, especially in the principality of Jagus.

"Yes, yes, it will be fine.

Tomax Bartmann was relieved to hear that.

"That's very kind of you. I will contact you through Mr. Makina when the date is fixed.

"Yes, sir."

At the moment, there is no hotline to contact Jin directly.

It is supposed to be through Makina.

In reality, Makina is Jin.

* * * * *

Next, we visited <.

The next person in the president's office was Ilmina Ratkin.

Since her predecessor has retired, she is the temporary president until a new president is officially appointed at the upcoming .

"Master Jin, welcome to our meeting.

I'm here today with a proposal.

She is a student of Marikka's, so she knows a lot about magical engineering.

Jin first told her the second purpose of his visit.

In other words,

"You have completed a magic tool using 3D magic circle, and you want us to mass-produce it in <> and put it to use?

I was told that.

"That is this."

Jin pulled out of his baggage a set of magic tools to make fresh water from seawater and refine salt at the same time.

<, it was decided that if salt could be separated when filtering seawater, it would kill two birds with one stone, and that harmful heavy metals would also be separated, albeit in very small quantities.

Jin explained the procedure as follows.

First, select a place where clean seawater is available.

Then, install this magic tool. By the way, it is about the size of an ordinary household washing machine.

One hose pumps up the seawater, and the other returns the unfiltered seawater back to the sea.

When activated, the seawater is pumped up and the fresh water and salt are separated inside the grimoire.

Other minerals are not separated in this prototype and are returned to the sea.

The pumping hose is equipped with a filter that cuts out the real trash ...... such as seaweed debris, leaves, and sand.

The main body of the apparatus has a large-capacity water tank (90% of the apparatus is a water tank), which stops when full.

However, the salt that is separated is pure sodium chloride, so it lacks a bit of flavor.

It is like .......

"Haaaa...... this is wonderful!　As expected of <> Jin-sama!"

"No, this idea comes from the record of the first generation who extracted useful metals from seawater.

"The first generation is ...... Adriana Barbora Zetsi?

"That's what I mean."

This explanation thrilled Ilmina Ratkin.

"That's amazing!　As expected of the !"

Then she hurriedly made up for it.

"Oh, I'm sorry..."

He felt that he could understand why he was Marikka's disciple.

* * * * * * * * * * * * * *

The third purpose was to talk about .

The third purpose is to talk about .

But it's not about specific magic tools, but about ideas to improve efficiency.

"Since then, I have done some research of my own, and I have discovered that the efficiency changes depending on the medium in which the magic circle is drawn.

"Oh, that's just like Jin!"

"We've been studying the golem as well, so we haven't made much progress."

Eira and Katya each responded.

"I see. That's a lot of work."

"But it's been fulfilling."

Gloma Tolley laughed, saying that she was a little tired, but that it was worthwhile.

"So here's the thing. If you impregnate the paper with magic resin instead of drawing magic circles on regular paper, the efficiency will increase.

"Haha, I see. ......"

"Because the magic resistance is reduced, right?

The cost is not that much higher!

Eira, Groma, and KaChea each gave their own comments.

"I tried it experimentally with the leather of the magical beast, but the efficiency didn't increase in spite of the cost increase.

"Oh, I see, you tried it after all. Would you like one at ......?"

Eira asks.

"Yes, what is it?"

"Well, if I want to increase the output by combining several magic circles, is it better to stack them, or to make them bigger, or to draw them in parallel on the same paper?"

Eira's question, Jin thought.

"Yes, in that example, making it bigger should be the most efficient. But it's not easy to handle.

For compactness, it is preferable to have similar values for height, width, and height.

Hence the idea of stacking.

"If it's parallel and stacked, then stacked.

"I knew it. If we're going to combine magicians, it's better to have them as close together as possible.

"That's what I meant."

In the parallel notation, the distance between the magic circles is equal to the size of the magic circle, but in the stacked notation, the distance is only equal to the thickness of the paper. That is why it is more efficient.

"Also, I'm still testing this, but I'm thinking of using white mica.

I've asked Saki and Hanna to do this, but they haven't come to a conclusion yet.

"It's not just a layer of paper, it's a crystal of that shape, so the bonding should be good."

Jin explained simply.

"I see. That's Jin's way of thinking."

"Not just me, though."

<.

* * * * * *

Since the day trip was scheduled to be a one-day trip, Jin visited Chief Superintendent Tomax Bartman again at 6:00 p.m. local time.

"Ah, Mr. Jin, you are already back?

"Yes, as scheduled."

Thank you for your hard work. Please come back anytime.

"Thank you, sir."

And so Jin was on the plane.

"Visiting the 4 Duchies or ......"

Jin remembered working at the research institute of the Jags Principality before the liberation of Horai Island.

"I wonder if the people from that time are still there now."

The past is the past.

It was not a good memory, but they knew each other.

He wondered what they would think if they saw him now ...... as he returned to Horai Island.