After answering all of Goh and Rubina's questions, Jin left in the storage room at the airfield and returned to the house.

"Welcome back.

Lara, the automata for Meltze, and Yenny, the maid of honor, greet him.

Jenny used to work for Viscount Yohia Gaignis von Igo, but since she was close to Zelma, Merce's birth mother, she has been with the Nido family for ...... about a year while Merce has been with them....

The five-colored golem maids were preparing tea.

On this day, sencha green tea and yokan (bean jelly) were served.

"Yes, it's good!

The yokan was moderately sweet. It matched well with the bitterness of the sencha.

Thank you very much. We have recently opened a good sweets shop in Leuthert.

Butler D explained.

"Yes, yes, that's right. Mel likes the sweet potato dumplings there!

"Ruby-chan!"

Melze beamed, her cheeks slightly tinted. Goh is also smiling at her.

I was relieved to see that the three of them seemed to be getting along well.

He thanked Elsa and Amanda in his heart for their hard work (of course, he expressed his gratitude directly to them later).

"Jin-sama, what's the best thing that's happened to you?"

Goh asked after finishing his cup of sencha green tea.

Jin thought for a moment before answering.

"I don't know if it's the most important thing, but ...... some volunteers got together the other day and put together a report on the ."

What do you mean by "volunteers"?

"I explained a little bit about Arnold, Theon, Rorona, Maricka, and so on.

I see!　Marikka-sensei too!

"Yes. I've almost found the whole picture of the mysterious . ...... Arnold is going to be a temporary lecturer at starting today or tomorrow.

"I see."

M?rze also asked a question.

"Ah, um, Jin-sama, may I ask you a question?"

"Yes, what is it?"

"You said ...... whether to be the first or not, so you have something else to talk about, don't you?"

"That's right. That's a good insight."

Jin compliments Mertze and explains.

"This is a story in the Kingdom of Selroa, where the <> has become so entrenched in politics that there is talk of what to do about it. This is something that only a few people, including the royal family, know about."

"Is it all right for you to tell me that?"

"Well, it's the story of the Kingdom of Selroa. But don't be so eager to tell the whole world about it.

Yes, of course.

"And then there's the soil contamination that we talked about in the morning.

There are lands in many countries that are contaminated with heavy metals, including the in the northwestern part of the Kingdom of Cerroa. If we could do something about it, the productivity of food would increase dramatically.

"But this is just talk, with no concrete method yet decided. As far as the Kingdom of Selroa is concerned, we may not be able to start until the problem of <> is cleared."

"Yes, that's right. ......"

"We'll need to remove the contaminants and improve the soil. I'm hoping that Rorona or her apprentice from the will be able to help us with this."

Jin then gives another explanation.

"And then there is, of course, the . I'm a bit curious about this one, not only because of that information, but also because a lot of iron seems to have disappeared somewhere."

"The ultimate weapon. ......"

What the hell is it?

"I have no idea. I have no idea. But since it uses a lot of iron, I imagine it could be something like a <> or a <> or something like that. It's just a guess."

"I see. ......"

"In a sense, though, it's possible that the < was the ultimate weapon."

Jin summarized the <> but added that there was no information about the <>, and then Jin said one last thing.

"Well, there's nothing we can do right now, and there's not much one individual can do.

Jin then said, "I don't think ...... Jin-sama is an individual, but .......

"By the way, Jin-sama, do you have one more question?"

"Yes, what is it, Rubina?"

"Well, you said that there are still remains of the bases from the time of the War of Magic around the Kingdom of Cerroa, but I wonder if there are any left in the Nordic Federation?

"Hm?　...... well ...... I see."

Jin thought back to the fact that he hadn't really looked into it. And then,

"<> is much smaller than this one, so most of it has been checked locally. That's why I wasn't concerned about it.

He confided the honest truth.

* * * * * * * * * * *

Then Jin spent the time until dinner in Goh's workshop.

Goh and Rubina wanted to make a model of the .

"You should make it about one-tenth the size, okay?　It has a lot of thrust."

"Yes."

Taking Jin's advice, Goh built a of 5 cm in diameter and 10 cm in length.

Rubina was in charge of the aircraft that would carry it.

"Wow, a delta wing plane."

Yes, the Nile VI.

I see.

Rubina was building a delta-wing plane when she held the Golem airplane competition on Onogoro Island.

The last one was , so this time it is VI.

The < is about 1.5 meters long, 1 meter wide, and 0.5 meters high.

That's great, but how do you control this thing?

It's remote-controlled.

I see. I heard it's quite difficult. ......

Oh, really?

Maybe we should have Hope or Reiko fly it once it's finished.

"Yes, ...... I'll do that."

Rubina listens to Jin's advice.

It seems that she has been aware of the difficulty of handling the <> since she heard that the <> with full-scale specifications could not be piloted by humans.

Jin directly drew a draft of the control sequence on the Magi Crystal for controlling the <>.

Thanks to this, Rubina and Goh were able to fuse the engine with the aircraft without any confusion.

* * * * * * * * * *

< was completed at 5:30 pm.

"The experiment will be done tomorrow," Jin said.

Rubina and Goh nodded their heads in agreement.