The five miniature craftsmen (smiths) quickly disassemble the watch into pieces.

They discover that the cause of the malfunction is a chipped gear and a broken spring.

Both of these damages were so small that they could be corrected by engineering magic.

He then examined the case of the watch and found that it was not stainless steel but chrome-plated. Jin's expectation that it was stainless steel because of its luster was not correct.

On the back of the watch, there were some letters engraved on the case back.

"something ......".

The name of the company, a seven-digit number that looked like a model number, and "JAPAN," were written on the back.

"I knew it. ......"

It had been a long time since I had seen such a familiar name. It was Jin who looked at the letters with nostalgia.

By the way, dust is strictly prohibited in a mechanical watch.

If dust gets caught between those precise gears, it can cause the movement to malfunction or stop.

So, in the past, mechanical watches were assembled in Switzerland in Europe, and in Suwa area in Japan, where the air was clean.

Nowadays, they are made in a room filled with clean air, called a <. Of course, they wear dust-free work clothes.

A word of caution.

Dust so fine that it is invisible to the human eye is a big mess to the one-sixteenth the size of a miniature craftsman (Smith). The advantage of the miniature craftsman (smith) is that he can handle it visually.

The repair and assembly were completed, taking care to prevent such dust from entering.

The solidified lubricant was removed and reapplied with Horaijima's lubricant.

The gears inside the clock were made of brass, but they had not corroded, perhaps because they had been well preserved, or perhaps because of some kind of magic.

The balance, which is the pendulum of a pillar clock, was left as intact as possible, and no adjustments were made.

"You've done it."

Jin gently holds the watch and carefully turns the crown.

"Perhaps you have wound it too much and broken the mainspring.

Older hand-wound watches could be over-wound and cut the mainspring when winding it with the crown.

Jin did not know this, but after seeing the structure, seeing the broken spring, and hearing the report from the mini-craftsman (Smith) who had serviced it, he came up with this possibility.

"Oh, it works."

The second hand began to move with a faint tinkling sound.

"Well, I can use this to find out if a day on the earth is the same as a day here on earth.

The units may be the same, but the actual time is not always the same.

For example, one hour on Earth may be 59 minutes and 45 seconds on Ars.

There is no guarantee that they are exactly the same length of time, although it is certain that there is no perceptible difference. So Jin thought that if he had a clock, he could compare the times.

"It would be possible if I could get the old man to check it."

On Horai Island, they use a clock based on the sun of the Ars world. They could give the time to the minute, but not to the second.

Jin hoped that if there was no significant difference between the Earth and Ars, he would be able to make a smaller watch by imitating this wristwatch.

This would be meaningless if the wristwatch had gone wrong after a thousand years, but it was an experiment.

The experiment was an experiment.

"Onii-chan, he said he's going to eat!

Hannah, smelling of soap after taking a bath, came to call Jin.

Jin, who had been absorbed in his watch, comes back to himself.

Reiko, on the other hand, was a little disappointed.

"Father, I'm sorry that I didn't notice the meal time.

But Hitoshi calms her down.

"No, this is worth more than one bath, that's all right.

Jin then answers Hanna's call.

"Oh Hanna, I'm coming."

The meal was with the mayor, Hwadong.

And sitting next to Goose was a girl who looked to be about the same age as Hannah.

She was snuggled up to Goose and seemed to be getting along well with him ......, but Goose looked a little tired.

Jin guessed that the mayor's granddaughter was fond of Goose, so she must have invited him. And Goose seems to be not good with small children.

The menu consisted of white rice, turnip miso soup, grilled river fish, smoked meat seasoned with salt and pepper, pickled vegetables, and so on.

"Ah, kunsei!"

Hannah exclaims. In the village of Kaina, Jin had made smoked meat, but there was smoked meat here, too.

Hwadong said, "I don't know if it's good enough for your palate," but it was a delicious enough dinner.

How do you like it, Mr. Nido?

Hwadong asked over a cup of green tea after the meal. Of course, it was about the watch.

"Yes, I think I can fix it somehow.

Hwadong smiled broadly when Jin answered.

"Really?　I'm so glad to hear that.

Please look forward to tomorrow.

Fadon nodded his head again and again, looking pleased.

"Yes, I understand.

After the meal, everyone was on their way back to their rooms when Elsa asked in a whisper.

"...... Jin, actually, isn't it already fixed?"

Jin smiled and nodded silently.

Erza nodded with a look that said, "I knew it,

"I'll be there later.

and went into her room.

Jin also enters the room assigned to him. There, a mini craftsman (Smith) was watching over his watch.

"Goshujin-sama, chanto goitemasu."

Smith reports in his usual gruff voice.

"Oh, thank you. So, did you find out the time difference?"

Reiko answered this question for him. The old man had given her some information.

"Father, it is only about an hour, so the error is large, but it seems that the seconds in our world are slightly longer.

"Oh. I see. Continue."

After that exchange, there was a knock at the door. Reiko has disappeared.

The room was Japanese-style, but the door was not a sliding door, but an ordinary door.

Brother Jin.

Jin.

Jin.

Onii-chan.

Erza, Goose, Saki, and Hannah.

The girl attached to Goose was gone.

"Goose, where is that girl?

Goose replied with a wry smile.

"She's the grandson of the mayor. I taught her a few lessons before, and she fell in love with me. ......"

As Jin had imagined. There was a reason why the mayor had somewhat forcefully invited Goose.

"So, so, I'd like to see the watch in motion.

As if to divert the conversation, Goose states his purpose as the representative of the group, but it goes without saying.

"Oh, sure. Here."

Jin pointed to the top of the table.

"Just take a look at it, okay?"

He reminded him.

The mini-craftsman (Smith) is temporarily out of sight.

"Well, he's moving!"

Goose looks on sullenly,

"I've never seen ...... before. Interesting."

Elsa is intrigued by the clock, which she has never seen before, even though she knows about it,

"Wow, this is a clock. It's an amazing thing that can measure down to the nearest second.

Saki was impressed by the use of the clock.

"Does this one have an escapement, too?"

Hannah then said something that exceeded Jin's expectations.

<

Using the isochronism of the pendulum, a gear wheel (or more precisely, a escapement wheel) is fed by two pawls, called , attached to the pendulum, which in turn send the wheels forward at a constant speed.

In the case of a wristwatch, instead of a pendulum, a component called a <>, which performs a reciprocating rotary movement called a <>, performs the same function.

These explanations and simple drawings were included in the that Hanna had seen in the village of Romne, and her comprehension was astonishing.

"That's amazing Hanna. You are a genius. ......"

Jin really wanted to develop Hanna's talent.