Among the students who came to listen to the lecture were, of course, Eira, Cachea, and Groma.

"......That's Jin, isn't it?"

"Jin-san, you are in your element."

Eira and Katya, who had recently worked together to create the crystal golem , had heard a little about the , but hearing about it systematically like this, they were just amazed at the feat.

Especially Groma,

"Oh, I'm sorry I was away last time!

Gromma bit his navel.

"Well, well. We can go and ask him personally later, can't we?

Eira hushed him.

"Well, I wish I could."

Glooma looks down at the documents in his hand.

"...... this , this will be the golem from now on.

Although Groma was accustomed to making spherical joints, he could not get rid of his dissatisfaction.

"The movement is too stiff. Maintenance is troublesome. The cost is not as low as expected."

In contrast, the <> is suitable for mass production and industrialization.

"I didn't know that there were people who developed such a method before the rise of the Federation of Magical Skeletons."

Groma-Toray was impressed by and thanked Jin for finding and sublimating this method.

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

Shortly before noon, the morning session ended and it was time for a lunch break. The afternoon session was scheduled to start at 1:30.

"I guess Jin and the others will have a separate lunch.

For this day only, those who could bring their own lunch were asked to do so.

There were estimated to be more than 500 students coming from outside of <>.

The capacity of the cafeteria was far beyond the capacity of a conventional cafeteria.

"It would have been fine if we could have used a cafeteria that is not in the neighborhood."

Groma says.

"Yes, that's one of the reasons why they are planning to install a high-speed network in the underground level."

Kechea, the well-informed one, said.

"If that happens, will probably become smaller."

Groma could not help but hope that the day would come soon.

* * * *

"Well, this afternoon we'll be talking to Grina and Rubina in earnest," Jin said.

Jin said.

Now they have finished lunch and are relaxing. Maricka seems to be having lunch with Tomax Bartmann, and Freddy and Grina have gone for a walk in the green area nearby, so it is just Jin, Reiko, and Rubina here.

"You got used to the atmosphere in the morning, didn't you?"

"I'm used to it, but ...... I'm still nervous."

Even with all her talent, at 10 years old, Rubina is still a child. Jin thinks it's understandable.

"At times like that, I tell her to think of the audience as pumpkins," she says.

"A pumpkin. ......

Rubina laughs.

"And then you can write on your palm and swallow it.

"What's that? Is it a spell to swallow a person?

Yeah, I think so.

"That's interesting."

Then Marikka came back.

"Mr. Jin, it's a big party, isn't it?

"Yes, he's a great guy."

Jin had been to the "XX Show" in Makuhari when he was in contemporary Japan, and he thought it was a small show compared to that.

"I'm back.

Glina and Freddy came back, too.

"Welcome home."

"This is a cozy school town, isn't it?"

Freddy says.

Freddy had originally gone to the magical engineering schools in the Kingdom of Egelea and the Kingdom of Klein to learn magical engineering.

They were also places of learning, but in retrospect the level was much lower than here.

"I can say this, though, thanks to Jin-sama.

Freddy said with a wry smile, "I mean low not only in an academic sense, but also in terms of the morals of the students.

"There are children of aristocrats who seem to be aristocrats in a bad way, and they are always comparing themselves with others. They are always comparing themselves to others. They are always getting on their high horse if they think the other person is lower in rank."

"Oh, that's not a place to learn."

Listening to Freddy's story, one is struck by the difficulty of education.

Even in modern Japan when Jin was there, there were problems of bullying, truancy, monster parents, etc. "But this is different," he said.

But not here. Only those who truly want to learn are gathered here.

Both Jin and Marikka looked at Freddy with a smile as he spoke with unusual enthusiasm.

* * * * * * * *

At 1:20 p.m., Jin and the others were in the dressing room of the main auditorium.

"Well, the afternoon lecture is about to start. I'll be there as we discussed.

"......Yes, sir.

And the clock ticked away: .......

<<

"Come on, let's go!"

Jin leads the way, followed by Freddy, Grina, and Rubina.

"Well, since this is the afternoon session, I will be giving a lecture on <>. Please turn to page 40 of the handout. There you will find a list of common metal materials.

Commonly used metals are iron, copper, silver, light silver (titanium), and mithril silver (an isotope of silver).

"However, metals such as adamantite, which do not have excellent stand-alone properties, are often used in alloys."

These include steel (iron and carbon), bronze (copper and tin), brass (copper and zinc), and duralumin (various combinations of aluminum, copper, magnesium, etc.).

"There are also special alloys, some of which are essential in small quantities."

These include mithril-added alloys, stainless steel, and 925 silver.

"Strength can be compensated to some extent by engineering magic or , but the higher the performance of the original material, the higher the limit value of durability.

Jin explained, "Don't be lazy and use the right material for the right job, as the word means.

"Next, the material used for the golem is . I will let my apprentice Freddie talk about this.

As agreed, Jin took over with Freddy.

"...... my name is Freddy, you introduced me to you. ......Magic resin is usually taken from the Pinaceae plant , but can't it be taken from other plants?"

The audience was abuzz. Up until now, 90% of the magic resin was the sap of the < plant.

"We were taught by Professor Jin to eliminate stereotypes and preconceptions. As a result, we discovered that we could also use the sap of a tree called , which is native to the northern part of the Laurentian continent.

"Oh," he exclaimed.

"Its performance is better than that of the sap from the . The of this is made of that resin.

Freddy stopped explaining for a moment, as the buzz in the hall grew even louder.

The crowd, eager to learn at , quickly quieted down.

"I will continue. There is one point to note. This < contains a toxic substance called atropine in its bark, so be careful.

Freddy then explained about atropine.

The audience listens in silence.

Among them were some acquaintances who had once worked side by side with Freddy in the magical engineering class in the Kingdom of Egelea.