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Before the morning session was over or not, Jin took Erza to the waiting room. Saki followed her.

"Erza, are you okay?"

"...... yes."

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Erza's reaction to seeing her father's face was not good.

She herself is not sure if she is happy or afraid to see her father.

Saki nodded her head at Elsa as she spoke of her feelings in a halting manner.

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"Yes, yes, I understand, Erza. I'm in a similar position. If you ask me if I want to meet my grandfather, I'm not sure.

"...... Saki."

Erza's face showed her anxiety. Jin gently holds her shoulder and whispers.

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"It's okay. I won't let anything happen to you that you don't want. Even His Majesty has given me his approval and if it comes to it, I'll kidnap her and take her back to Horai Island.

"...... brother Jin

"If you wear that disguise now, you won't be noticed. And first thing in the afternoon, I'll surprise them. You'll see."

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"...... yeah."

Jin's confident words make Erza feel a little better.

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

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After lunch, the second half began at 1:30 p.m. The giant golem was gone before I knew it. It must have pulled out during the intermission.

Then, an announcer's voice echoed through the hall.

Now, let's start the afternoon session. First up for the afternoon session is the Honorary Magical Craftsman of the Kingdom of Egelea, Jin Nido!

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Many of the audience, who had seen the mini-golem the day before and were familiar with Jin's abilities, applauded loudly.

The audience included the female emperor Gerhard Hilde von Rubies-Shawlo, Prime Minister Jung, Minister of Magical Technology Degauze, Ernest, the third prince of the Kingdom of Egelea, Rieschen, the third princess of the Kingdom of Klein, the second-ranked magickraftsman of the Kingdom of Celluloa ( Magecraftsman), Stearina Beta ......, were all curious to know what Jin had brought with him.

Jin, with the help of the steward and Reiko, set up something in the center of the plaza and began to make preparations. Then he began to explain.

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"This is Jin Nido. Ladies and gentlemen, this is a bag made of the threads of a ground spider.

At the mention of the word "ground spider," there was a surprised shout in several places. They must have known that these are very rare creatures.

Steward and Reiko unfold the bag. Holding it by the edges, they pulled it open, and it looked as if it was about 40 meters long.

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"I'm going to inject a special gas into this bag.

The magic tool that had been working since yesterday, the accompanying tank, and the huge bag were connected with a hose. The bag begins to inflate.

The purpose of the fixture was to collect only the helium in the air.

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"Oh, oh, oh!

What the hell is that?

Before the audience's eyes, a huge bag is inflated. It is a long, thin balloon. It has a kind of stabilizing wing on one side.

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"Why is it floating?"

After the balloon was inflated to a certain degree, it gradually began to float into the air from its lying position on the ground.

"...... airship......"

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Elsa, who was in the arena, said in a whisper, "What?

"What did you say?"

"You know about this, Miss Erza?"

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Reinhardt, who was standing next to her, and Bertsche asked.

"Yes. It's called an airship. It floats with a lighter-than-air gas in its air sac ......."

During this explanation, the air sacs of the airship continued to inflate. The shape of the air sac is now clearly visible.

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At the bottom of the air sac was a cage that served as a crew compartment.

It was not suspended by wires, but was directly attached to the air sac.

A separately prepared tubular part was attached to the basket.

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"This is a magic propulsion device. It uses wind magic to send out wind and make use of its recoil.

This is not a magical jet propulsion engine. That one uses the original magic that Jin has created by eliminating the magic formula (Magi Formula) that absorbs the recoil, while this one uses conventional magic.

In principle, the pressure is increased by squeezing the wind generated by the <> magic inside the tube. It is similar to blowing a strong breath with the mouth closed.

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In this way, the pressure generated is greater than the recoil absorbed by the magic, and the difference between the two is used to drive the machine.

Although less efficient than a magical jet propulsion engine (magijet engine), the airship is able to generate sufficient driving force.

Finally, the airship floats completely.

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I shut off the magic device supplying the lighter-than-air gas ...... helium, disconnected the hose, and sealed the inlet with engineering magic.

"In case a hole is made and the lighter gas escapes, there is a risk of crashing, so the air sac ...... is divided into several chambers inside this bag to prevent the gas from escaping all at once."

The airship is now moored to a ship's mooring post with a rope so it won't float, but once it's untied, it's likely to soar into the sky.

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"Now then, who would like to fly with me?　Besides myself and my assistant, one other person can ride with us.

"Me?"

The first person to speak up was a woman. And the people standing in line were astonished.

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"...... Your Majesty ......"

Yes, because it was the Shoro emperor who had nominated her for the air trip.

"Your Majesty!　No!

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But, as expected, the people around him stopped him. Even Jin was a little, or maybe a lot, surprised that a female emperor would be running for the office.

"Well, um, is there anyone else?

"Well, I'll do it."

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The first person to raise his hand was a face that Jin knew well. Saki Eschenbach.

Please come in.

Jin beckoned Saki to come in.

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Reinhardt, who had failed to raise his hand by a hair's breadth, looked disappointed. He was so surprised by the queen's candidacy that he reacted too late.

Saki came to the middle of the square and said to Jin with a mischievous smile.

I was wondering what Jin was going to do. I'm so afraid of you.

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Jin then gave a supplementary explanation to the audience.

"I heard that a group called the Unification Party (Unifilers) recently took to the battlefield in a vehicle called a <>. In contrast, this is called an airship. It can fly faster and longer than a hot air balloon.

This explanation elicited gasps and sighs from some of the participants. They must have seen a hot air balloon.

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Meanwhile, Jin got into the basket for boarding. Reiko and Saki followed him.

Erza was in the arena with Reinhardt and Bertsche, looking enviously at them.

"Okay, let's go. ...... Steward, get your hands off me."

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Steward let go of the rope holding the airship, and the airship floated up and completely off the ground.

"Oh, it floats!"

A roar of excitement rises from the audience.

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Jin picked up the control stick and blasted the magic propellant downward. The airship's upward speed increases as a result of the reaction.

"Oh ......"

"Wow, that's great!"

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"......, it flew. ......"

As the audience watched, the airship soared into the sky.

"Wow, Jin, that's great, it feels so good!

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Saki was very excited. It was Jin's first time in his life to ride in an airship.

The cage is not sealed, and the mica windshield is only on the front. So we could feel the wind. It felt good.

"Okay, let's keep going."

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The airship started to move forward by the recoil of the wind that blew out as soon as the magic propellers were activated.

"Yes, yes, this is nice!　I never knew looking down on the ground could feel so good!"

Saki is in high spirits. Jin leaves the fine control of the airship to Reiko.

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Jin does not know the details of the airship. So the details are Jin's original.

The buoyancy of the airship is increased or decreased by means of a magi device placed inside the air sac.

Heating the inside of the air sacs to make them more inflated increases buoyancy, while cooling them down decreases buoyancy by decreasing their volume.

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Actual airships do not do this, but Jin's superior magical skills covered the difference.

"Oh, wow, that's amazing!

"It's flying. ......

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"I wish I could fly too. ......"

"I'd like to ride it, too. ......

"It's quite fast. Faster than a horse-drawn carriage, isn't it?"

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"That's what I'd expect from a gin. ......"

"Mmmm, Jin-kun is really great."

The spectators in the audience looked up at the sky, some in amazement, some in admiration, and some pondering its practicality.

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