"...... Jin bro, wow. Thank you."

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Erza was unusually excited after successfully absorbing Jin's knowledge, even if it was only a beginner's level.

"......I finally understand how matter is structured, why things fall, and why airplanes fly."

Elsa has gained a level of scientific knowledge that is roughly the level of an elementary school student to a junior high school student. She is excited to have understood all her questions at once.

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"Now Erza is officially my apprentice. I'm warning you, don't spread the word too much, okay?　You know you have to be careful, right?"

"You're saying that to my brother Jin?"

Erza was unusually blunt.

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Jin smiles, scratches his head, and returns to his original goal.

"Well, the bed and futon are ready, but we can't carry them ......."

The bedding is too big to fit through the carriage's warp gate.

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"Father, I think we'll have to pack them properly and carry them secretly."

Reiko, who had been silent until now, spoke up.

"Yeah, I see. That's the only way. ......"

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And so it was decided to transport them by invisible aircraft in the middle of the night.

"We should also build a floating base around Lake Tosmo. ......"

The old man hears Jin's muttering and decides to build a floating base, but that is a story for a little while longer.

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"Well, is this good enough?"

Jin muttered as he looked at the bedding and bed as a gift for Reinhardt. Erza made a request to Jin.

"...... Jin brother, I also want to give a gift to Rai and his brothers.

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"Oh, yes, Erza would like to congratulate them too. What do you want to give them?

To this question Elsa immediately replies.

"A mascot."

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"A mascot?"

Elsa explained to Jin, who asked back.

She explained that it is customary to give a doll as a gift to protect the newlyweds. When her brother, Moritz Randall von Amber, was married, Reinhardt's mother gave him a doll.

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"I want to make a doll like Non and give it to her."

Non was a Japanese doll that Jin gave to Erza for her birthday. Erza liked it so much that she still keeps it in her room in the village of Kaina.

"Okay. Go ahead. You can use any material you like.

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But she doesn't use much of it.

"I'll teach you if you don't understand something.

"Okay. I'll try."

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So, leaving Erza to her own initiative, Jin finally decided to work on the other goal, the improvement of Reiko.

"Reiko, did you see how <> is doing?　I want to add that kind of <> to you. Would you like that?"

Reiko nodded.

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"Yes. I have no objection to what your father would do for me."

"Good."

Jin called out to Elsa, who was working hard on various things, and went upstairs with Reiko to the laboratory.

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The material used for the tactile sensor is the wing membrane of a sea dragon.

The wing membrane of the dragon species is moved not by muscles but by magic power. In other words, they can be manipulated at will by means of mana.

When spread out, the wing membranes are stronger than steel, even though they are only a millimeter thick. Conversely, when folded, they are so soft that they offer no resistance.

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Using this property, Reiko can make her skin harder than steel or more flexible than a baby's skin.

Furthermore, it is known that the wing membranes generate magic power when they are stretched and bent.

This is true not only for dragon species, but also for all magical beasts and demons with wing membranes or feathers.

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However, the materials available at that time were even inferior to the wing membrane of a Siamese dragon or that of a sea dragon, so the magical power generated was very weak, and even the previous generation did not think that it could be used for anything.

However, Jin thought that the skin could be used as it was as a tactile sensor.

"Hmmm, then we need to distinguish between the magical power generated when the skin is deformed and the magical power emitted by Reiko, don't we?

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Jin thought for a while and came to the conclusion that the pattern of Reiko's magic and the magic generated by the skin would be different.

"Okay, Reiko, sit there for a moment,...... and try to hold or open your hand."

"Yes, Father."

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At the same time Jin tried to follow the flow of magic power using <>, <> and so on.

"I see. ......"

Jin caught and analyzed the minuscule flow of magic power emitted from Reiko's skin.

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He repeated the process for 15 minutes.

"Okay, I've got it."

This investigation revealed that it is not the <> but the <> that makes the difference.

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The larger the deformation is, the higher the magic potential is. By reading the magical potential, the amount of deformation can be determined and the force applied to the deformation can be calculated.

Jin imagined the image of a thermal imaging camera. The high and low temperature areas are color-coded, whereas the high and low temperature areas are shown in this case.

"And that means we need a magi device to read the distribution ......"

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So far, we only needed to read the < of the body.

It is the first device in the world that reads the distribution of magical potentials, and it is also the first attempt for Jin.

This is also a first for Jin, and a device that will revolutionize automata.

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The flow of magical control (Magi Sequence) was carefully considered, and the Magi Formula was combined.

"The basics are tracing and inspection. Then, after applying it, once it's taken in, we can weight it and calculate the position backwards ......."

Talking to himself, Jin slowly completed the new magi device.

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It is a Magi Device that consists of a complex Magi Formula, comparable to a control core.

"...... was done."

Jin muttered to himself as he leaned back against the back of his chair, as if he was indeed tired.

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...... well, it's getting late, I think it's better to call it a night."

Surprised by Reiko's words, Jin looked out the window. It was completely dark.

It is already around seven o'clock.

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Thanks to the etheric luminescent substance (AL), which emits light automatically when it gets dark, he did not notice it at all.

"Okay. Then, let me put this on you for the last time.

"Yes, sir, I will."

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The installation into Reiko takes about a minute.

"Since it is not yet linked to your operation, it should not be difficult to move. In the meantime, try to collect data.

"Okay, sir."

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Reiko nodded her head. Jin noticed the time again.

"Oh, that's right, where's Erza?

He hurried downstairs, where he found Elsa busily working on a prototype of the mascot.

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"Hey, Elsa!"

Jin called a little louder, and as if coming back to himself, Erza stopped working and looked up.

"Oh, Brother Jin!

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"I just realized it's already seven o'clock. That's enough for today. Let's have dinner.

"Yeah. I'm hungry."

Blushing slightly, Elsa brushed the dust off her hands and body and sat up.

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"......I think I understand a little bit about how my brothers Jin and Rai feel.

Erza's face turns even redder as she says this.

"Haha, I don't know if that's ...... the best thing to say."

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I'm talking about the fact that Jin and Reinhardt sometimes neglect their meals to make things. Until recently, Erza had been the one to rebuke Jin and the others. .......

Jin and Erza returned to the village of Kaina through the warp gate.

The time difference between Kaina Village and Horai Island is about two hours, and it is almost dinner time in Kaina Village.

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Welcome back, Mr. Jin. Welcome back, Elsa. We are just getting ready.

Meine greeted me.

"......Oh, okay. That's the time difference."

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Erza, who had acquired a basic knowledge of science, seemed to understand.

Jin was looking forward to seeing how Erza would be able to use this knowledge in the future.

"Welcome back, Honhyan."

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Hannah also greeted him smilingly.

Jin's heart was warmed by the thought that his was here, even if in a slightly different way from Reinhardt's.