April 25th, when Jin D. and Reiko returned.

Jin reported to Zion in the Nordic Federation after a day's rest in Horaijima.

"Yes, it was a hard time. Thank you for your hard work, Jin.

When Sion learned that Jin had been involved in more trouble than he had expected, he said to him in a friendly tone of voice, "So, Jin.

"So, I wanted to ask you, Zion."

"...... about that bandit golem, right?"

"Yeah. Do you know anything about it?"

"Well, ...... maybe Marikka knows more than I do. Let's call her.

So I called her with the manacam, and Marikka rushed over.

"Jin-sama, welcome back.

"Hello, Marikka. I'll get back to you as soon as I can. ......"

Jin explained about the golem he had met in the Blue Lands.

"A golem that is neither Adriana nor spherical-jointed?"

"Yes. Do you know anything about it?

"Yes. Yes, but only a little. ......

Maricka began to speak in halting tones.

"First of all," she said haltingly, "the fluid-form drive didn't make it into the mainstream after all. It was too heavy.

It uses a magical isotope of mercury (magiisotope), which has a specific gravity of about 13.5.

Since it requires metal armor as a container and exterior, a golem the size of an adult male would weigh as much as 900 kilograms.

If the weight of the weaponry is added, it comes to nearly one ton. This is the weight of 13 human soldiers. This is too heavy to be useful.

It would also be difficult to move it by airship.

"I understand that. But I don't think that magi rocks or magi resins would be more powerful than magi mercury."

"That's right. So, when the spherical joint system was established, I thought it was a major turning point.

However, although the spherical-jointed type certainly contributed to lowering costs, it was inferior to the Adriana type in terms of visual elegance of movement and durability in extreme situations.

"It couldn't be used for human-like automata."

Maricka speaks in a deep voice as if recalling those days.

"The spread of golems and automata was the goal of all the countries of the world in terms of securing labor. However, it was not cost-effective and did not work out as expected."

"I see."

Perhaps it would be easier to understand if we compare it to the spread of the private car in modern Japan.

In the 1950s, private cars were not widely used in ordinary households.

However, with the arrival of the Tokyo Olympics and the construction of the Tokyo Metropolitan Expressway during the period of rapid economic growth, private cars began to spread as a kind of status symbol.

After the oil shocks, the term "private car" became popular in the 1975's, and it became common in the 1985's when the bubble economy hit.

At the dawn of the automobile industry, Henry Ford, who was called the "King of Automobiles," introduced a revolutionary model called the Model T Ford, which was mass-produced using a production line. （The highest price was $950 (at that time), but the lowest price was $290 (at that time).

Let me digress.

As with automobiles, there was a group of engineers who thought that the cost reduction of the Golem could also be brought about by mass production.

"They were related to the <>," says Maricka.

Maricka says.

"They were not directly related, so they must not have known about the existence of Horai Island, but there were people who read through the literature in the stacks at Nido Castle in the village of Kaina and at the house of Royzart in the Shoro Imperial Palace."

"Hou."

"I do not know his name either. At that time I was working in the Nordic Federation to educate the younger generation.

"I see. I see. ...... That's good. A relative of the Jin family ...... is a descendant?　Did a relative of the Jin family develop a new method?"

"I can only assume so."

At this point, Jin asks a question.

"Well, if ......, why didn't it spread?　......, by any chance?"

And in the process, he came up with the reason himself.

"Yes, because of the League of Magic and Marcitas.

"I see."

After that, Marikka had the direct descendants of the Jin family quarantined on the island of Onogoro.

"I see. I think I understand most of what you're saying. Thank you."

I'm glad I could be of service.

Maricka bit her tongue at the last minute.

* * * * * *

After taking a break, Jin continued talking with Zion and Marikka.

"If that's the case, it means that the bandits found the golem made by the engineer, right?"

"That would make sense."

Perhaps the Duke of Bruu would interrogate the bandits and reveal their location.

"I'm curious about the place. Where is it?"

The question that he asked himself was answered by Sion.

"Well, why don't you ask the Duke of Breu and he will accompany you?"

"I suppose so.

Jin would like to see this technology spread.

He would like to see someone in a public position find the technological legacy and use it for the benefit of the world.

And that's it, that's it. Jin also wanted to see the heritage with his own eyes.

"I just want to see it first ......".

Then Reiko, who had been silent for a long time, opened her mouth.

"Father, the old man says he knows about it. To be precise, he has been monitoring the interrogation at the Duke of Breu's place with a peep show telescope.

So he is aware of what he has confessed.

"Oh, yeah. So, where are you?

Yes. ...... is in the eastern part of the Kingdom of Celluloid, in the region of Rivas, Futux.

I see. I believe it's near the border with the Kingdom of Klein?

Yes. There's a fort nearby.

Father, there is ......

Reiko began to explain to Jin what she knew.

In those days, countries had research institutes in various regions to conduct various researches.

The reason why they were not placed in the center of the country was simply because of the lack of large areas of land.

Such research often required a large area of land for experiments and field tests.

As for transportation, there were means such as transfer magicians and airships.

In Futtocks, there was a fort that had been built during the time of the conflict with the Kingdom of Klein, so they renovated it and turned it into a research institute.

"That would have been very spacious, well built, and with living facilities.

Jin imagined that it must have been very easy to use.

"There must have been a lot of motivated researchers."

Jin tried to imagine how crowded it must have been at that time.

Then, Jin thought, let's go there first to see what was going on.

Since there would be some formalities to go through to get from the Kingdom of Egelea to the Kingdom of Cerroa, Jin thought that he would have a few more days to spare.

"What about Zion and Marikka?"

"I don't mind.

"No, I don't think so either.

Both of them said they would not go, so Jin and Reiko went back to Horai Island for a while.