After getting out of the hot spring, Jin lay down on the tatami mats in his living room to cool off.

"When I meditate like this, I can hear the sound of insects, it's a nice atmosphere. ......"

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There were many autumn insects living around the pavilion and they were playing a symphony in the autumn night.

At that time, Jin heard footsteps.

"Are those footsteps Elsa or ......?"

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If the footsteps were more mature than Hannah's, it could only be Elsa. However, she seemed a little panicky.

"Brother Jin!"

Her voice seems to have gone up even more.

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"Erza, what's wrong?

Jin opened his eyes and saw Erza standing there. She was wearing underwear.

"Erza, what happened?

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"Brother Jin, isn't the <> of <> the same as the power we normally use in engineering magic?"

"......?　What?"

Jin was so upset by Erza's unexpected attire that he didn't understand half of what he had heard.

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"......That's embarrassing. Then, can you understand me when I say this?　The power used in ...... engineering magic is the same quality as <>, isn't it?"

"E...... ah, ah..."

"...... now, you understand?"

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Then Hannah came in. And she said.

"Elsa, don't you have any clothes on?"

"So ...... what, clothes?"

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When Hannah said this, Erza realized that she had been standing in front of Jin in her underwear.

"E,a,uh,...... ah!"

She turned bright red and ran out of the living room. Jin wondered in the corner of his confused head if he had fallen down when he heard a thud in the distance.

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"Well, isn't the power used in ...... engineering magic the same as the recoil-erasing magic?"

Finally Jin's head started to spin and he seemed to understand the implication in Erza's words.

"Old man, the Jin family has been summoned to an emergency meeting."

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* * * *

"......, so Erza got a hint of the solution."

In addition to Jin and Erza, Reinhardt and Saki, along with Toa and Stearina, were holding the second on Horai Island.

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"Erza, please explain."

Jin urges Erza, whose face is still a little red. Erza began to speak in halting tones.

"......First of all, I want you to think about the < of engineering magic. ......Rai, do you know why the form of matter can be changed by ?"

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When asked, Reinhardt thinks for a moment before answering.

"Why? Because we are using magic to change its shape. That's the kind of magic I'm talking about. ......

Just as he was about to say this, Reinhardt seemed to notice.

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"So, the force that is transforming matter is ......!

"Yes. I realized that it is the same force that creates wind, makes fire fly, and deforms matter.

"Hmmm, interesting."

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Toa muttered as he folded his arms. Stearina was the next to open her mouth.

"I think I understand. The basis of moving a crystal golem is <>, isn't it?

In other words, we can see from this that the magic of <> is powerful enough to power the golem. Everyone is convinced.

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"If that's the case, I think it's strange that <> is the only special power.

Erza concluded.

Saki then chuckled and anticipated Erza's comment.

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"I see. But then, Erza must have some idea why Jin failed last time, right?"

She was referring to the experiment in which Jin had tried to invoke only the reaction-elimination spell without using wind magic and failed to do so.

But Erza shook her head.

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"No. I don't know about that. I don't know about that. But I have thought of another possibility."

"Another possibility?"

"Another possibility? The best example is the earth magic <. It is a magic that sends stones flying and hits the opponent, but what is its power?"

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"Oh, I see. ......"

Everyone understood what Erza was trying to say and nodded in agreement.

"As I hypothesized before, all mages can emit a little magic power on their own. Let's call it mental power or mental waves. This mental wave is an original magical power that a mage can create. Using this power, the surrounding free magical elements (ether) are changed into magical elements (mana), and magic is activated by changing the magical elements (mana) into energy. <, it is kinetic energy."

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Jin explains his hypothesis.

Fire magic is thermal energy, and wind magic is kinetic energy.

If this kinetic energy is applied to a stone, it would be a stone pellet of earth magic.

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"Now, the source of kinetic energy is force. This power is the mage's mental waves, or mental power, amplified into a greater magical power that also controls energy. We do not yet know the mechanism.

Jin reiterated that he would leave the elucidation of the mechanism for another time, and this time he would analyze the .

"I would like to call the force that amplifies mental waves and has kinetic energy <>. I am not sure if this term is appropriate, but since it is a force that is generated according to the will of the performer, I think it is not wrong.

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There is no disagreement among them.

"<> is also easy to understand if we consider that telekinetically transforms matter, isn't it?　Wind magic is the same. It is telekinetically moving air.

Everyone listens to Jin's statement in silence. At this point, Jin changed the subject.

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"Now here's a question. Can magic move people?

Reinhardt quickly responded.

"I think it is possible if we use , for example.

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"That's right. That's right, Reinhardt.

Reinhard scratched his head in embarrassment at Jin's praise.

"It's a little embarrassing to hear you say that. After all, there was a precedent. Yes, the ship of Eckert Tekles, you see.

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Eckert is a wealthy man living in a town in the southern part of the Kingdom of Selroa.

He had built a huge ship and was using wind magic to blow wind from his sails to power it.

"Yes, that is a good example. The idea is to use physical phenomena generated by magic, rather than magic itself.

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But it is not magic itself.

"Can't we move people with telekinesis?　This is the key.

Everyone continued to think in silence for a while. Then Stearina was the first to open her mouth.

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"Jin-kun, that you just used, can you make the golem fly?

Jin thought for a while before answering.

"Yes, I think so. Let's try an experiment. ...... mini-craftsman(smith)!"

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"Yes, Goshujin-sama."

Jin called up a 10cm-tall golem.

"I need your help for an experiment."

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Jin explained briefly. The point is that he wants to see if he can make a miniature craftsman (smith) fly with a stone pellet.

"Yes, sir.

Jin went out of the laboratory and asked Reiko to catch the miniature craftsman so that it would not be broken when it flew away.

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"Leave it to me."

"Alright then, let's give it a try. ......<>"

Jin activates the magic in his bracelet. As a result, the miniature craftsman (Smith) flew through the air and was caught by Reiko.

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"Oh!

Jin!

"Oh, this is it!"

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They all gazed at the scene in amazement.

"It seems to be possible if we can accurately recognize the object to be flown. How about something bigger?"

After the mini-craftsman (Smith), they experimented with a little craftsman (Smith), 40 centimeters tall, which also worked well.

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"Father, in that case, please let me fly".

Finally, he accepts Reiko's offer, and tries to play on her.

"Stone Bullet!"

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"Whoa!

Reiko flew through the air and landed with flying colors about 10 meters away from the target.

"Ji-jin!　This is a great find!"

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An excited Reinhardt rushed to Jin. Saki, on the other hand, calmly commented.

"I wonder why no one has used it like this before?　Oh, no, it can be used to blow up the other golem in a war or something, not just for flying.

"Well, it requires a certain amount of magic power compared to flying stones."

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It means that the same amount of magic power is consumed as the mass ratio of the stone to the golem. If the stone is 1 kilogram and the golem is 200 kilograms, then 200 times as much magic power is required. I see.

"I see, so you didn't even try to do it because it requires too much magic power for the effect.

Nevertheless, there is a silver lining. The Nin family decided to further work in this direction.

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