On the third workbench.

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"What is this?"

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　The shape of the object is unfamiliar to Arnold.

　It was a meter long, about 10 centimeters in diameter, pointed on one side, with an opening on the other side.

　It had several small wings around it.

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* * * *

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"This is ......."



　To Jin, it looked like a <.

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　He explains this to Arnold through <.



* * * * * * * * * *

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"I see, this thing somehow injects gas through the aperture and flies through the air by the recoil of the gas. Then it flies toward the enemy and explodes when it hits the enemy. ...... That's a pretty nasty weapon. Or maybe all weapons are like that.

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　Still, 700 years ago, when the only kind of flying machine was a hot-air balloon, no one would have thought that a missile equipped with a propulsion system that seems to be a rocket engine would exist.



* * * * *

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"It would be a weapon that has never been used ....... And before it was completed, must have occurred and development was halted.

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　<.

　He would like to see the in person.

　But the site is said to be almost devoid of oxygen. He can't go there in the flesh.

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"I guess I'll have to use my doppelganger here. ......"

"But father, in that case, don't we have to explain the existence of Horai Island to Mr. Arnold and the others?"

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"Yes, Reiko is probably right. If Jin D. ...... suddenly goes there, they will wonder where they were loaded, and when they come back, I will be on Horai Island, not here."



　But," Jin continued.

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"We could bring Arnold into the ."

"That's for sure."

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　The old man then gives his support.

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< join the . I have been observing him for a long time and he has been a good friend.

"I see. Okay, when this mess is over, I will invite them to Horai Island and introduce them to the <>."

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　Jin decides to do so, and returns to Horai Island via the warp gate inside the <>, and activates Jin D, his <>.

　Jin-D then returned to and headed for the underground facility with Reiko.

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* * * * * * * * * *



　Of course, Arnold and the others had been notified through , so they were not surprised when Jin D and Reiko showed up.

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"Hey, is this Jin ......? I see you're here too."

"Yes, Arnold. I'm the one piloting this body, so you can call me <>."

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"Okay. You came to see this at ......?

"Yeah. ......, it looks like a missile to me. ......

What kind of missile are you talking about?

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Missile is ......



　Jin D. explains, "A missile is a weapon that flies toward a target while changing its course.

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"I see. Is this the ?"

"I don't know about that, but I'm surprised that we've suddenly gone from hot air balloons to missiles ...... or rocket propulsion."

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　Saying this, Jin D analyzes the <>'s propulsion system.

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"Hmmm ......."

"What do you think?"

"This is a <><><......>."

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　In principle, it is really a rocket engine.

　The only difference is that the fuel is <> and the explosion seems to use the magic of <> instead of a reaction with oxygen.

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"But is that so ......"

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　Thinking about it again, Jin D=Jin could understand the reason for the sudden development from balloons to rocket engines.



"You don't have to think about solid fuel or liquid fuel or oxidizers or anything at all. ......"

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　The rocket engine is even simpler than the jet engine. Yes, just the principle. (Except for the control.)

　The balloon inflated with air flies, and the octopus and squid that swim by the recoil of seawater inhaled and exhaled are also rocket-propelled.

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　In the past, Jin applied wind magic to the magijet engine without eliminating the recoil, but this would be easier. I know I am repeating myself here, but control is another matter.

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"However, as long as <> is used, the engine itself will be heated, so heat-resistant materials will be necessary.



　<

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　Therefore, it can continue to fly as long as it is supplied with mana.

　The fact that it does not need a fuel tank means that it can be easily miniaturized and has a long flight range.

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"As a weapon, it would be quite powerful.

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　Arnold seemed to have understood the situation a little better after listening to Jin D's explanation.



"But this is a prototype, and it is not equipped with a guidance system.

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　Jin D explained the results of his analysis.

　It's not a missile if it doesn't go after its target. It's just a rocket," said Jin D.

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"But I am sure that the was invented here.

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　I would have liked to have met the engineer who invented it, Jin D. said.



"I agree with you.

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　Arnold agreed.

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



"Well, now that we're here, let's see what else we can analyze.

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　Jin D started to analyze the other two: ......<> and <>.

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"Hmmm, neither of the ......<> have any <>, do they?"

"Yes, they do. We don't know what they were going to fire."

"I guess. ......"

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　At this point, Arnold remembered that he had received two magi crystals from Golem some time ago.

　He took them out and showed them to Jin D.

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"Jin, can you check them?

"Jin, can you check it out? ......<>......"

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　Jin D casts engineering magic <> on one of them.

　This reads out the information stored in the magecrystal.

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"Wow, this is ......."

"Isn't this an important secret ...... military secret?"

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　It showed what kind of strategy the was planning at that time.

　According to the report, it recorded the results of a simulation on the tactics and strategy of using <><><><<>>.

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"Well, even if it were a military secret, it would have been invalid by now."

"That's true."

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　However, Jin D. thought that it would be better to have this information managed by .

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