"Dear Jin, Elsa, you look so happy."

This is Jessica Norton, Captain of the Kingsguard Ladies.

Thank you.

Thank you. ...... Jessica, what's up?"

Jin thanked her honestly, but after thanking her, Elsa asked a penetrating question.

"Yes?"

For a moment Jessica didn't know what he was talking about.

"No, I'm just wondering if you have a good partner, Jessica. ......"

I've already given up."

She said flatly.

"Jessica is not so innocent,......, Gloria."

"Yes, yes!"

Gloria was a little flustered when Princess Rieschen asked her to speak.

How old is Gloria now?

Princess Rieschen is not afraid to ask the question, which is a bit difficult for Jin to ask.

"Twenty-four, ......."

"Well, how about Jessica?"

"Twenty-eight."

"Hm."

Rieschen is a bit thoughtful when she hears this.

(Hey, what's the right age? ......)

(They say it's between 15 and 20 years old.)

Jin was exchanging a whisper with Erza.

(That's the story of ordinary aristocrats, isn't it?　What would Erza think?)

(...... depends on the person, but I don't think it's a problem up to 30 or so.)

(I guess it depends on the person...) (I guess it depends on the person...) (In my country, there are many people who had children after 30.)

The marriageable age is often determined by the short life expectancy due to nutritional and hygienic problems.

"Anti-aging or ......"

Jin said out loud. Princess Rieschen heard him.

"Jin, what is anti-aging?"

"Oh, you heard me. In other words, it's a way to keep up with your age, I guess."

"What?　Is there such a thing?

Jin-dono, what is it?

I'd love to hear about it!

Princess Rieschen, Jessica, and Gloria were all eager to hear about it. Elsa's eyes were shining as if she wanted to know too.

(Always and everywhere, I want to stay young, don't I? ......)

Jin wanted the Director to stay young and healthy, so he had gathered a little knowledge about such things.

He was just a layman, and the Director was not very pleased with Jin's concern for such things, so he stopped it soon.

"Let's see... ......"

Jin twisted his head, trying to remember the knowledge he had gathered in the past.

"First of all, I'd like to take care of my skin..."

"Hmmm, yes. It would be better without wrinkles and blemishes.

"The cause of that is ...... uh, sunburn.

Since the word "ultraviolet rays" would not be understood, I have changed it to "sunburn.

"If you repeatedly tan your skin, it gets darker, doesn't it?　If you leave it as it is, the skin loses its luster and tone.

"Is that so?"

Even though they are women, all knights are sunburned to a greater or lesser extent because of their frequent outdoor activities.

"Sunscreen and skin care will make a big difference.

"Sunscreen?　Is there such a thing, Mister Jin?

Gloria leaned forward. I thought she had a sword fetish, but she was interested in skin care.

"Well, just dissolve a fine powder of titanium dioxide in moisturizing oil and apply it, it should make a big difference. ......"

"Sankatitan?"

"Oh, light silver powder, you know what I mean."

Titanium is called light silver in our world, so Hitoshi rephrased.

"Hmm, light silver powder has that effect ......."

"And then there is the diet. Meat, vegetables, and grains should all be eaten.

Jin was not very familiar with dietary treatment.

"It will keep you in good shape. And constipation is also a big enemy.

Elsa adds.

Jin thinks for a moment that people in this Ars world seem to have robust bodies.

Although he has not been able to verify whether this is due to the <> in their bodies or not.

Excluding illness and injury, their life span seems to be a little longer. This is also something I can't conclude for sure since I haven't kept any statistics.

"Hmm, how do you make that ?　Or is it sold?"

"Well, you can find it at ......."

Titanium, or light silver, is oxidized to TiO2, which is then ground into a powder and mixed with appropriate oils and fragrances. Elsa did not know how to make TiO2.

So she glanced at Jin's.

"......"

Actually, Jin doesn't know how to make TiO2 on modern Earth either.

But there are two kinds of engineering magic < and .

Although not often used, it is < that removes (or rather reduces back to iron) iron rust, and it is this < that oxidizes the surface of light silver (= titanium) and gives it color.

It is possible to make oxidized light silver (= titanium dioxide) and powderize it.

"Well, I've been working on a prototype at my place the other day, and if I can sell it, I'll sell it.

Jin almost forgot that Reinhardt and the others had told him that he should not give anything away for free.

"Hmmm, I see. Then you will sell them to us soon, right?

"Yes. Probably through the Raglan Trading Company, I guess.

When Jin said this, Rieschen nodded in agreement.

"I see. It will also help stimulate the economy. It would be better than having it provided free of charge."

It seemed that Rieschen was thinking more about the economy of the country than about Jin.

"I'm sure I'll be able to get a sample to you soon."

"That would be fun."

Jin promised on the spot that it would not be difficult to make a sample, even if it was half out of his own mouth.

This automatically made it a done deal for the next day's interval.

"Let's get back to the story at ......."

Originally, it was supposed to be about marriageable age.

"Both Jessica and Gloria are still of marriageable age."

Elsa took over the line.

"I guess so. If all the female knights are late in marrying, there will be no one left to become a knight.

Princess Rieschen smiles innocently.

"Isn't that right, Jessica, Gloria?"

Yes, yes. ......

"Well, I don't know what to tell you. ......"

Neither of them had any answer, and they both looked puzzled.

"So, let me get back to this..."

Finally, Jin decided to ask if there was someone he was in love with.