On June 13, Marcia and Rodrigo were testing a prototype ship.

"This is amazing!"

The prototype is a trimaran. It is the result of an attempt to achieve both high speed stability and mobility as much as possible.

Compared to a monohull, the trimaran has a larger area in contact with the water, making it slightly less suitable for high-speed navigation, but this is compensated for with a new type of propulsion system provided by Jin ...... Machina.

Compared to the same type of propulsion system, the new propulsion system has twice the output power, and the prototype ship was being propelled at a brisk pace.

"That's great, Dad."

"Yes, it is. Jin-dono ...... no, Makina-dono's technology is amazing."

"Arrow, how fast is it?"

Yes, Miss Marcia. Current speed, approximately 70 kilometers per hour.

You're clear of the target!　You still have time, don't you?

Yes, sir. Propulsion load is at 82 percent.

Good. Arco, let's test the maneuverability!

Yes, Miss Marcia.

This ship accommodates five passengers. Arco is the pilot and Arrow is the engineer. Marcia and Rodrigo are focused on checking the boat.

The bay is ideal for such tests because the waves are calm.

Arco starts with gentle curves and gradually cuts sharp turns. The speed is about 50 kilometers per hour.

"No, the stability is not so bad.

The catamaran's expertise in lateral stability was put to good use.

"How is the hull distortion?　How about the hull distortion?

"...... Yeah, the girders are a little creaky. It would be better to reinforce it a little more.

With that, we called it quits for the day.

While returning to the potlock,

"I think we can do it because we have enough power for the propulsor. Now we just need to find a comfortable seat.

Marcia laughed.

Marcia laughed, "Oh, hey!

"Hey, Marcia!"

"Oh, Jin!"

When the prototype returned to the workshop, Jin was waiting for her.

Marcia and Rodrigo went ashore. Arrow and Arco are the ones to bring the ship ashore.

"I've finished the buffer material I promised you before, and I brought it with me.

The buffer material is the <Magi Polyethylene Foam that Saki has developed. The abbreviation is . Expanded　Magi- PolyEthylene EMPE).

"Here you go. ...... Wow, this is nice and light!"

"Right?　It doesn't absorb water, so you can put it in the cracks of your boat to prevent flooding.

"Oh, I see."

"By the way, you've built a prototype ship, haven't you?"

Marcia nodded happily at Jin's confirming question.

"Yes. "Yes. There are still improvements to be made, though. Jin, will you listen to me?"

"Yes, sure."

That's when it happened.

The Death Serpent is out!

A frantic cry was heard from the ship returning to port.

"What?"

A guard gave the man a detailed account of what had happened, while Jin and Marcia listened in the background.

According to the report, two Death Sea Serpents had appeared to the north of the island of Trieu, just beyond the island of Io.

Three boats were fishing in the area, and one of them was capsized, but was luckily rescued by another boat that was nearby.

However, the ship was chased by the Death Serpent, and the crew barely managed to escape by landing on the island of Trieu, but their ship was destroyed.

The ship that contacted them was the furthest away from the Death Serpent, and the Death Serpent targeted two other ships, so the crew barely made it to Potlock.

It was probably fortunate that the ships were fast boats made by the Marsyat workshop.

"We will take a hot air balloon to the island of Trieu to rescue them. I see that there are five evacuees, right?

Yes, sir.

Then we can rescue them with two balloons.

Then, Jin could no longer remain silent,

"If we launch the Conlon 3, we will be able to rescue them right away."

He said, "If we launch the <>, we can go to the rescue right away.

On the same day, he had come to Potrock with the Conlon 3.

After this, I was invited by Marquis Florenz Firenziano of Florenz.

Since I can't use <, I came to Potrock by Conlon 3.

The time is 4:00 PM. If we were to prepare from now on, there was a high possibility that the sun would set by the time we reached the island of Trieu at the speed of the hot air balloon.

"Koron 3? ...... Uh, so you're the then?

Yes, I am.

Yes, I am.　My name is Druusen Batlle, captain of the Potlock Coast Guard. May I ask you a favor?

"Of course."

Druesen was an honest-looking man of about 30 or so.

Jin instructed Reiko, who was standing beside him, to use the built-in manacam to contact Edgar, the pilot, and tell him to bring <> to us. The landing site is designated as the central plaza.

"Father, they will be here soon."

"Yes."

Jin informed Drossen, the head of the security team, and hurried to the central square.

Jin, Reiko, Drossen, and the other guards, as well as Marcia, arrived at the central square at about the same time.

"Get back, it's dangerous!"

The security guards ordered the tourists and onlookers in the central square to stand back, and <> landed without any problems.

"Come on, let's go!"

"Jin, I want you to take me with you. I want to see the Death Serpent in the flesh.

Marcia said that it would be useful in building a high-speed boat to counter the Death Serpent, and Jin agreed.

With Jin, Reiko, Marcia, and Drossen aboard, the takes to the sky.

"Oh, wow, that's great!"

Drossen is amazed by his first ride in an airship.

"Marcia, are you sure that Tru Island is that way?"

Jin pointed to the opposite side of the setting sun.

"Yes, that's right. The island of Trieu is located further east of Io Island, as seen from Potrock.

"Edgar, will you take care of it?"

"Yes, sir. I'll take care of it."

flies away at about 100 kilometers per hour.

"Oh, that's fast!"

Drossen is astonished, but neither Jin nor Marcia are concerned.

Below them, they see two Death Sea Serpents approaching the Potrock.

"Oh, that's the Death Serpent, isn't it?　Oh, they are big!"

Indeed, one of them was about 30 meters long, and seemed to be one of the largest Death Sea Serpents.

"That's not good!　Two of them will come to Potlock if we don't do something!"

Drossen shouted, his face turning pale.

"We've got to do something about them before we can rescue them!"

The only thing we have to deal with now is Conlon 3.

We're on the wrong ship. Jin decides to kill the Death Serpent.

Edgar, you're on top of them.

Yes, sir.

Conlon 3, which was traveling east at 100 kilometers per hour, made a 180 degree turn. At 30 kilometers per hour, it was perfectly positioned over the Death Serpent.