After leaving the Kingdom of Celuloa, Jin and Erza were flying in .

It is 3:00 in the afternoon.

Their next destination is Leusert, the capital of the Kingdom of Shoro. In short, they are going back to their home.

"I feel like I've been away for a long time..."

"......... I feel like I've been away since the end of January."

It's been a long time since I saw Barrow and Behle.

Today is March 22nd. I had not been back home for more than a month and a half.

Flying about 500 kilometers at 200 kilometers per hour, it would take two and a half hours. Because of the time difference, it was 4:30 p.m. when I arrived in Leuthart.

We slowly descend to the landing area on the roof of the house.

Barrow, who may have noticed this himself or may have been told by Butler D, greeted Jin and the others on the roof.

"Jin-sama, Erza-sama, Reiko-sama, Edgar-sama, welcome back!

"I'm home. Thank you for your hard work. I'm sorry I was gone for so long.

No, that's what I'm supposed to do.

The grown-up Barrow bowed his head.

Jin left Lily and Rose to moor <> and headed for the stairs leading downstairs with Reiko, Elsa and Edgar.

"Welcome home, sir."

At the top of the stairs leading downstairs, Behrle is waiting to greet Jin and the others.

"I'm home. Thank you for staying at home.

Would you like a bath or would you like to eat first?

"Well, I'd like to take a bath."

Yes, of course.

Yes, sir.

After taking a bath, Jin and Erza enjoyed their first meal in the Shoro Kingdom in a long time.

After all, there was white rice and miso soup with bonito broth.

Of course, you can have these foods in Horai Island as well, but the taste of the rice is slightly different.

It seems that even the same variety of rice tastes different depending on the environment in which it is grown.

Yes, the rice here tastes lighter.

The rice from Horaijima is stickier. Jin likes both types of rice.

If I had to say, the light rice is more suitable for sushi and rice bowls, while the sticky rice is more suitable for lunch boxes and rice balls.

Of course, Jin's preference is to eat the rice as it is when it is cooked.

"Then there is rice with seaweed or rice with an egg on it. ......"

Jin wished he had access to soy sauce in abundance.

"Well, let's have a little talk about the future.

After lunch, Jin sat down across from Elsa and began to talk in a light tone over a cup of hojicha tea.

"There are two things we need to focus on. The transport ship and the car.

"I understand that transport ships are used to transport copper. I'm also looking forward to the car.

"Oh, Elsa told me about that, didn't she? A golem wagon would be fine, but I'd rather go by car anyway.

Jin ties the knot, though he hasn't decided on any details yet. Elsa asked him a question.

"What about the spaceship?"

Reiko answered. She has been receiving occasional reports from the old man.

Since Jin had been busy with many things recently, he was going to give a summary report when he had achieved enough results to let us know.

"The small prototype seems to have been successful. I understand that you are now testing the medium-sized prototype.

By small, I mean the experimental machine that the mini-golem rides on. It is roughly one-sixteenth the size.

The medium size is Little Golem, which is one-fourth the size of Little Golem.

Each of them is about 50 meters in size for one quarter. ...... The small size will be 3 meters long. The medium size was to be 12 meters.

"To be more precise, the small prototype went through the stratosphere and into the vacuum of space, where it was tested for three days and found no problems, so we began work on the medium prototype."

We will report back to Jin as soon as the mid-size prototype is successful," Reiko concluded.

"Well, I'm looking forward to it."

Jin thinks that since they are going into a completely unknown world, they want to be extra cautious.

"Well, we'll start with the transport ship. Let's see what we can do. ......"

Jin thought that we could load the copper in the Kingdom of Selroa, go out to the sea via the Naudaria River, and then go up the river that flows out of Lake Tosmo, whose name I don't know, and arrive at Koju.

But Elsa said to me, "Oh, the Inert River has many bridges, so a big boat is impossible.

Elsa told me, "Oh, there are too many bridges on the Inert River.

"Hmmm... ......"

If we just want to take the boat to Horai Island, there's no problem.

"Then, why don't you get the copper you want to use here?"

Erza's words made Jin realize now that he had that idea. He has enough money to buy the copper.

The Shoro Empire is also a country that produces a lot of copper.

"But why do you care about copper?"

It was only when Erza asked him a question that Jin realized he was alone in his convictions.

"Oh, I don't remember talking to Elsa about this..."

"Yes, I don't remember hearing anything about it.

"I see, I'm sorry. I'm sorry. Actually, it's a piece of the Golem 74-10 that was used by 600012. I just happened to have a piece of that Golem7410 or whatever it was that 600012 was using.

Hmm."

"Then I found it's stronger than steel. I was so surprised that I asked the old man to examine it in detail.

The result was an alloy of copper and beryllium.

The copper alloy contained 2 percent beryllium and a little cobalt.

If that were all, it would be the same as beryllium copper on Earth, but when some neutrons are replaced by magic molecules, as in the case of mithril silver, the strength of the alloy increases dramatically.

"Such copper can be found on Horai Island."

The beryllium copper to which about 20 percent of the copper from Horai Island was added was stronger than that to which ordinary copper was added, and had a strength comparable to that of 64 light silver.

"We're still experimenting to see what would happen if the neutrons in the beryllium were also replaced by magicons, but maybe we've discovered the orihalcon."

"Orihalcon?"

Erza tilted her head at the unfamiliar word.

"Ah. Originally, orichalcone is a legendary metal that is said to have existed in the past on my planet, but there is a theory that it was a copper alloy like bronze or brass.

Some say it is a reddish metal, and the corresponding metal is copper. Bronze, which is made by adding tin to copper, became a very hard metal, and it was the age of bronzes until iron was put to practical use.

In ancient China, during the Shang period, the word <> seems to have referred to copper. Gold was called <>, and iron was called <>. It is said that the reason for <> gold is because only very brittle iron could be refined.

"I thought that if it was strengthened with free magical element (ether), it could be an Orihalcon.

At that moment, Reiko interrupted.

"Father, it seems that your guess is correct. I just received a call from the old man."

"What?　...... Okay, let's hear it from him. I'll be right there."

Jin was light on his feet when it came to anything to do with magical engineering. He got up and went to the basement.

In the basement of the mansion there is a warp gate that leads to and from Horai Island.

Leaving Erza at home, Jin moves to Horai Island with Reiko.

"Reiko told me. What did you find out?"

<

The information sent by the two 600012s by sendinfo (The information sent from the two 600012s by < was written not into the control core of the Jin double, but into the <> for absorbing the rewritable magic of the slaves.

Since the same information was emitted from two locations almost simultaneously, some of it interfered with each other and became meaningless as data.

Such data amounted to almost 50 percent or half of the data.

"That's too bad."

<<< Yes. However, some information was not needed in today's world. How to make a homunculus.

"Well, yes.

Since we can't get a psychic catalyst by ordinary means, we can't make a homunculus, and we don't need one.

<

"Oh, that's for sure.

Since we are currently building and experimenting with prototypes, it is indeed unfortunate that such potentially useful data is no longer available.

<

"Oh, so the golem was made of orichalcone.

<<

"It might be good to know the direction with a compass."

<<< Yes, it is. ......, so I think it is safe to call the Magi beryllium copper developed by the Master (Mylord) an Orihalcon.

Thus, the fantasy metals known to Jin, namely adamantite, mithril, and orichalcone, came to exist in reality in this world of Ars.