After leaving the inn in the port town of Potrock for the time being, Jin returned to Horai Island for the time being.

In another 10 days, he would go back to Potrock and head for Shoro with Reinhard, a nobleman of the Shoro Empire.

In Potrock, we gained a lot of things. We found some fish sauce, but it is regrettable that we could not find any rice.

"Ah, a bath is so nice!

Since there had been only a shower or something similar in Potrock, Jin was relaxed in the morning bath for the first time in a long time.

"Father, let me wash your back.

Reiko was standing by his side. She looks no older than ten, but inside she is a super automaton who can take on an entire country.

"Oh, please."

While Reiko was washing his back, Jin was thinking about what he was going to build.

"I want to make a high-speed boat, but first I want to make an airplane using a magical jet propulsion engine (Magijet engine).

The Magijet engine is a jet engine based on wind magic. The fact that a jet plane was created before a propeller plane is something that can only be said to be possible in the magical world.

After getting out of the bath, Jin prepared a large amount of light silver.

Light silver is a metal that is light and conducts magic power well. It is composed of titanium with an atomic number of 22, and most of its 26 neutrons are replaced by magic molecules.

It is no wonder that Jin chose it as a material for aircraft. He also decided to use quartz for the wind shield.

After deciding on the materials, they immediately started work.

"Well, since it's the first time, the main wings are normal tapered wings with no recession angle.

We don't intend to go faster than the speed of sound from the start.

"How do we mount the engine?"

Jin thinks it would be easier to balance the propulsion through the center of gravity.

"Put it in the back, with the air intake in the front."

Gradually, the shape of the plane begins to take shape.

The problem is the control system.

He had built model airplanes before, but he had never seen the cockpit of a real airplane. I had never even been involved in such a game.

"Well, I heard that the control stick moves the elevator, directional rudder, and aileron," he said.

With his limited knowledge, he decides how to control the aircraft.

"The speed is determined by the gas pedal and brake. And the brake should be linked to the flaps.

Jin is enthusiastically finishing up. The light silver mass has now been transformed into a shining silver airplane.

"Even if it can't be autopiloted, some degree of autonomy would be helpful," he says.

This is when golem technology comes into its own, and based on their experience with the glider golem they had previously built, they used magi crystals to assemble a navigation aid system.

In this way, the prototype became a sort of mish-mash of technologies.

"It's done!

That afternoon, the first prototype of the plane was completed. A runway was built in parallel, and Topaz, one of the five-colored golems in charge of land development, was ordered to maintain the runway.

"Well, let's make the first flight!

Jin was about to board the plane in high spirits,

But Reiko stopped him.

Reiko stopped him.

"According to your story, this magic tool can fly, right?

"Yes, it does."

"I trust your father's technology, but what will you do in case it malfunctions or breaks?"

"......"

I hadn't thought of that. I didn't have a parachute or anything.

"Please, father, let me do it first."

Reiko, being a super automata, would be able to handle most things.

"Well, all right, Reiko. I'll leave the test flight to you."

"Yes, sir.

So, I had Reiko memorize how to fly the plane by using transinfo. The seat was too low for Reiko, so we readjusted it, and finally the first flight was made.

Then, "Well, I'm off!

The wind was light and it was a perfect afternoon for flying. Reiko fired up the Magijet engine.

The sound of air jets echoed, and the prototype began to glide. The speed gradually increased, and Reiko pulled lightly on the control stick,

"Yes!　It flew!"

The prototype lifted off lightly and flew into the blue sky.

"It worked!"

Reiko flew around Horai Island, and when she got used to it, she started to test the limits of maximum speed, rapid ascent, rapid descent, rapid turn, and so on.

Without a speedometer, the speed was 400 to 500 kilometers per hour. The maneuverability and stability of the aircraft during rapid ascent, descent, and turn are satisfactory. This is largely due to the use of light silver, which is five times stronger than duralumin with a weight equivalent to superduralumin. In addition, the navigation aid system learns and supports us.

"Oh, I'd love to have a communications device."

The visual equipment can be reproduced from the magic eye and the magic screen that we saw during the competition in Potrock.

"Can we make something that can be called 'magic ear' and 'magic mouth'?"

The names are tentative, of course.

The sun was setting and it was getting dark, so Jin beckoned Reiko to come down.

Reiko, sensing this, lowered her altitude and headed straight back toward the runway.

"Birds!"

A flock of birds crosses in front of the plane as they return to their roosts at dusk.

Birds slam into the fuselage. The windshield is fogged with the blood of crushed birds, and the magical jet propulsion engine sucks in the birds along with the air. <.

The magical jet propulsion engine (magijet engine) stops after sucking in a large number of birds. The birds block the view and throw the aircraft off balance.

The result is a stall and a crash.

Reiko!

The prototype crashes from an altitude of about 50 meters and is so badly damaged that it cannot be seen from the ground. The fact that it does not catch fire is a product of magical engineering.

Jin rushes to the crash site. Reiko's assistant golems, Soleil and Luna, are on both sides.

"Ha, ha!"

What was waiting for Jin, who arrived at the crash site out of breath?

"I'm sorry, father."

Reiko bowed deeply.

"Reiko, are you all right?　Are you all right?

Jin asked,

"Yes. There is nothing wrong with this body that your father gave me. However, I broke the plane that you entrusted to me. ......

Jin hugged Reiko,

"You can make another plane, you idiot. But Reiko, you're the only one."

"Father, I'm an automaton. If you were my father, you would be able to make me again and again. And since I am not a person, it would be more correct to call me one.

Reiko said and Jin smacked her on the head with a slap,

"You idiot. You are you, and your experiences from birth to today, the memories of our time together, are yours and yours alone. They may make automata that look like you, but Reiko is yours and yours alone."

"Father ......"

Reiko buried her face in Jin's chest.

"Thank you,......."

Then, in a quieter voice,

"Reiko is lucky."

She said.

Let's go home. We will improve the second plane so that such an accident will never happen again.

"Yes, I will help you as much as I can."

Soleil and Luna carried the broken aircraft, and Jin and the others returned to the laboratory.

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

The hand that hit Reiko on the head hurt so much, but Jin could not show it on his face.