After finishing the meal, the afternoon was spent doing whatever they wanted to do.

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Jin headed for the mine, but Reiko appeared in a deserted place after she had released her stealth. Then she said..,

"Father, something seems to have happened on Horai Island.

She told Jin that something had happened on Horai Island.

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"What do you mean, something that even Lao Tzu can't handle?

"No, it is more like an important discovery that I would like to report.

"I see. Okay, I'll go home.

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Jin and Reiko return to the carriage in a concealed manner, using stealth himself. Jin could not see outside, so he asked Reiko to pull him back.

Confirming that no one is watching, he quietly gets into the carriage, activates the hidden warp gate, and jumps to Horai Island.

* * * * * *

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"Welcome home, my lord.

As you exit the warp gate of Horai Island, you are greeted by the voice of Laozi.

"Ah, I'm home. I heard you have something to report?"

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Jin went to the room where the main body of Lao Tzu was located and sat down on the chair provided. Reiko stood by his side.

"Yes, my lord. Actually, it's about the <> unit.

The Albatross is a plane that flies on a magical jet propulsion engine created by Jin.

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"We are still making topographic maps by aerial surveys, but in the process we have learned something unexpected."

Unexpected?

Yes. First of all, please take a look at this.

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instructed Jin, and a map in the process of being made was spread out in front of him. He is in charge of Land 1, the army golem.

"It's very well done, isn't it?"

"Thank you, sir. The details are still to be worked out, but I think we have a rough idea of the terrain.

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"Yes. But why is there not much of the southern hemisphere?

The topographic map showed the northern hemisphere in detail, but only a little of the southern hemisphere.

"That is the point of this report."

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Lao Tzu then began his report.

"At first the measurements were going well. But then <>, which was heading south, started complaining of anomalies. At the same time, the sky golem on board also reported an abnormality."

"Anomalies?"

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"Yes. It is a decrease in the operating efficiency of the ether converter. However, no abnormality was found when we examined the returned Albatross.

Hearing this, Jin had a hypothesis in his mind, but he refrained from making an immediate decision due to the lack of information and let <> continue.

"And the <> headed for the north, on the contrary, the efficiency of the ether converter has increased abnormally. The Sky Golem on board also reported a similar increase in efficiency."

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Hearing this, Jin felt that his hypothesis was correct.

concluded from the above that the concentration of free magical element (ether) in the air seems to increase in the north and decrease in the south, which is consistent with Jin's hypothesis. This is consistent with Jin's hypothesis.

"Father!"

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At that moment, Reiko, who had been silent until then, opened her mouth.

"In your mother's time, the north was the land of demons and the south was the land of humans. Is there any relation between the two?

Hearing this, said,

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"Thank you, Reiko, for your good information. Master (My Lord), from the information we have now, it seems to be certain that the concentration of free magical element (ether) becomes more concentrated the further north you go.

He concluded that the concentration of the free-magic element (ether) becomes more concentrated the further north one goes. Jin agrees. Reiko also agreed,

"Besides, there was a place where the efficiency of the ether converter was abnormally high when I went looking for your father before. It might have been in the north.

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Jin agreed. Jin agrees with this and speaks out his conclusion.

Yes, if that much is true, there seems to be no doubt about it, regardless of the reason. If that is the case, it is urgent to develop a plane that can go to the south, not to the north.

So, Jin started to design a new type of plane in cooperation with .

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"It should be equipped with three ether converters. It will also be equipped with a large mana tank so that it can fly without free magic element (ether).

Unlike mechanical airplanes, neither the ether converter nor the mana tank are very large, so adding them will not make the plane any larger.

"Master (My Lord), I also recommend the addition of a magical jet propulsion engine (magijet engine).

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suggested that it would be better to add more engines. Jin decides to adopt this opinion,

"Okay, let's add one engine on each wing. With a total of three engines, a longer flight distance would be possible.

Although the number of engines is not simply proportional to the distance flown, it would be effective in terms of making it easier to increase the flight speed and altitude. Jin is not an aerodynamicist by nature. He only has experience in building model airplanes. If it is not correct, he will just rebuild it.

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Thus, it was decided to build several aircraft.

The first one is a long-range reconnaissance plane. It is equipped with three ether converters and three magical jet propulsion engines. It has a large mana tank and can theoretically circumnavigate a planet in this world with ease.

The next is a transport plane. It is similar to a long-range reconnaissance aircraft, but the wing area and fuselage volume have been increased in order to increase the weight capacity rather than the flight range.

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The last one is for covert maneuvering. <, but has a stealth function, enhanced offensive power, and can move at high speed. It is not too much to say that it is a stealth fighter.

Each of them is named <> for reconnaissance, > for transportation, and for stealth.

Skylark is a lark and Raptor is a bird of prey. The names are derived from the names Jin heard when he was on Earth. Albatross seems to be a more suitable name for a long-range reconnaissance aircraft than Skylark, but it is Jin's name, so we should not be concerned about it.

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The name of the aircraft is "Albatross".

After completing the design, Jin looked at the map again.

I have a rough idea of the size of this star from my previous surveys.

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"But it is smaller than I thought.

<
"I guess it's still packed with heavy elements ......, maybe even magic elements."

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Jin is also interested in the structure of this star, but he decides to leave that for later.

"<>, there seems to be a disquieting atmosphere in this world as well, so be on your guard.

He reminds her.

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"Yes, you are talking about <> and the Unification Party (Unifiler), aren't you? Reiko-san has reported it too.

"Yes, she has. If they find out about this place they'll definitely come after us. Be careful.

Yes, my lord. Then the village of Kaina must be on the lookout too.

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Yes.

The name of the village is very special to Jin. It is a village that can be called his second home.

Now that Jin had received the title of Honorary Magecraftsman in the Kingdom of Egelea, he had high hopes that he might be able to visit the Kingdom of Klein and the village of Kaina in one of its regions with pride. It would be a little while before that happened.

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Jin then spent some time listening to detailed reports on the development of the island and the situation in Kunlun Island.

In a word, things are going very well.

Finally, I asked him about the mining of eladite, but unfortunately, he told me that no vein of ore could be found on either Penglai Island or Kunlun Island.

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"Well, it can't be helped. Keep on investigating.

"Yes, my lord."

Jin passed through the warp gate again and returned to Yada village.

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

It was still light in Yada village due to the time difference.

Jin gets out of the carriage and checks for any damage, but finds nothing wrong.

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"Ah, Jin-kun."

Then a voice called out to him. I turned around to see Erza.

"What are you doing?"

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"Yes, I'm checking the carriages. Tomorrow we will go to the village where the ruins are, right?　That's why."

Elsa looked satisfied when I answered that.

"You're good, Jin. You've made all these things and you're still so cautious.

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"Haha, flattery will get you nowhere."

Jin replied to Erza's compliment,

"Okay, everything is fine."

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He clapped his hands and said.

"I hope the weather will be fine tomorrow."

"Yeah."

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Jin looks up at the sky as he walks alongside Elsa.

The reddish sunset clouds seemed to be telling him that tomorrow would be a fine day.