Hitoshi instructed Reiko to boil down all the remaining sap until it becomes maple syrup.

Saki seemed to have had a moment to herself, so they started over again.

"Well, I don't like the way Saki is looking at it ......."

Reinhardt's face is a bit grim, as a childhood friend he must be concerned about her.

"By the way, why did the servant leave?"

Jin asked. Saki scratched her head and told him the reason with a wry smile.

"Well, he hadn't paid me for three months."

"That's no good. ......"

Jin couldn't help but butt in.

"Anyway, I'll have the meals brought from my house. ......

Reinhardt looked thoughtful.

"What's going on here?　We have a lot of expensive materials here. ...... you don't think so?"

"No way, maybe that's the answer. My father buys anything and everything he can find that's rare. No, neither do I."

In short, he seems to be a research idiot with no economic sense.

"Why don't you put an ordinance on him and have him take care of it?"

Reinhardt is a bit taken aback by this, but Saki keeps a cool expression on her face.

"We are not aristocrats. We don't need a butler.

"But ......"

Saki responds as if she is not a member of the family, and Reinhardt looks worried. Jin has a plan.

"Yes, Reinhard, we could make her an automata.

Reinhardt is very enthusiastic about the suggestion. The crafty idiot is in full force.

"Oh!　I didn't know you had it in you!　Of course, you'll help me, right, Jin?

"Of course."

Jin's reply made Reinhardt even more excited.

"Yes!　I'll make the world's second automata!"

Seeing Reinhardt in high spirits, Saki asked him a question.

"......Whatever, what is the <>?"

"Hmm?　That's easy. The best automata in the world is Reiko, who is there.

Saki's words reminded her of Reiko, and she looked at her with bespectacled eyes.

"The more I look at it, the better it looks. ...... that reminds me, Reinhard, and Jin. We are lucky to have two of the world's top magi engineers here.

Saki leans forward on the table.

"Hmm?　Is there something you want to ask me?"

Alchemy and Magi Engineering have some things in common, and they have been developed by influencing each other.

Reinhardt, who had a light hearted feeling that Saki probably had some questions, did not expect that he would not be able to respond to her next words.

"So, I ask you, how can magic dolls such as golems and automata hold fragile cups without breaking them?"

"...... Ugh."

Reinhardt froze.

The basic movement control of golems, automata, etc. is usually taught by a master. The master is in turn taught by his or her master.

This control system can be compared to an operating system. In other words, ordinary magical engineers (magi engineers) inherit and use it in a black box manner from their masters. There is no progress.

If we trace the origin, most of the current control methods can probably be traced back to Adriana Barbora Zetsi.

And the details of the control schemes, like magic, are recorded in the <> of the <>. Most of the magic engineers (magi engineers) have access to them, copy them and use them.

And what about Jin?

"...... Well, it's too complicated, so I'll give you a somewhat simplified explanation. First, you recognize an object. Then, you compare it with your knowledge, and if it corresponds to the object, you grasp it with a force appropriate to its strength.

He explained the process in a simplified manner. This impressed not only Saki but also Reinhardt.

While Reinhardt was ruminating over the details of the explanation, Saki asked a further question.

"Hmmm, interesting. If it's ......, what if it's something you don't know?　If it's something you've never seen before, you wouldn't know how strong it is, would you?"

"You're asking a lot of questions again. ...... recognition of the object, that's as far as it goes. If it is something you don't have knowledge of, you do the act of <>. Is there anything similar, or is there any material that is similar?

"I see, I understand."

Jin smiled at Saki who nodded.

"If there is something similar, that's good. But you want to know if there is none, don't you?

"Yes, that's right.

"I guess so," I thought. ...... Start the action of grasping. Fingers touch the object. Apply force. ......Are we clear so far?"

"Yes, of course. The problem is what happens next. Too much force and you break it. If you don't put enough force into it, you won't be able to hold it. What do you do?"

"I'm detecting a distortion between the object and my fingertips."

"What?　...... is that so, Jin?"

It was Reinhardt who said that. He asked me for the first time, looking as if he had never heard of this before.

"The control core is giving orders while predicting the shape of the body as it should be. The body is moving just a few tenths of a second later than that.

".................."

Both Saki and Reinhardt listened silently to Jin's explanation.

"When your finger touches an object, the movement of your finger slows down, depending on the hardness of the object. If the object is soft, it is less likely to slow down, and if it is hard, it will slow down immediately. This is quickly detected and the necessary force is determined.

Jin then adds.

"By the way, you can be wrong. Even ...... humans are heavier than they look and can be dropped. However, we often manage to do so because our reaction speed is dozens of times faster than that of human beings.

After explaining all this, Jin looked at both of them alternately.

Reinhardt, being a magi engineer, was trying to digest the information he had heard as knowledge, but Saki seemed to be satisfied with just knowing the concept,

"Well, thank you, Jin!　You have just answered one of my long-standing questions!"

She was overjoyed.

"You are right that the control core can think dozens of times faster than humans, right?

"Yes, that's right."

Jin nodded at Saki's question as if to confirm it.

"So the control core is doing the hard work of predicting the shape of the body as it should be."

"Oh yeah, ...... hmm?"

Jin thought again about Saki's question.

Basically, the principle of "simple is best" applies to everything. This is especially true for systems.

"Jin?　What's wrong?"

Saki, wondering about Jin's sudden silence, calls out to him, but he does not hear her.

（The control core devotes much of its processing power to the act of force adjustment. In other words, it is left to the software. ......)

Jin is not an expert in electronics or IT, but as an engineer living on the modern earth, he had heard of the concept.

(Software is certainly applicable. (Software is certainly applicable, but if the hardware can take over, the burden on the control core can be reduced and more processing can be done. ......)

"Hello?　Jin?　Hey."

Jin was more focused on his thoughts than he had been recently.

（What would be the alternative?　......Automata and golems were made to imitate human bodies. What is there in a human body that is not in an automaton? (...... tactile, huh!)

Sight is eyes. Hearing is the ear. Nose for smell. The sense of taste is the mouth. Each of these senses had their own magi devices and formed pseudo-sensory organs.

The sense of touch, however, was quite poor.

For heat and cold, a thermosensor-like magical device (magi device) was placed in the chest, monitoring the temperature of the metal skeleton. It is a secondary device of the magi device that produces body temperature.

If used properly, it can also detect the temperature of objects touched by the fingertips.

The sense of pain is not taken into account from the beginning.

(A while ago, I guessed that the reason why Reiko remembers swordsmanship but doesn't use it is because it is difficult to control the force.)

Complex movements require subtle force. Even if she has dozens of times more processing power than humans, it would be extremely difficult for her to adjust her power while moving dozens or hundreds of times faster than humans.

The power of Reiko is tremendous. It would be literally an order of magnitude more difficult than adding or subtracting 10 to 1 or adding or subtracting 1000 to 1.

If you think for a moment, you can understand which is more difficult to adjust the power, a simple movement such as punching and kicking or a complicated movement such as joint techniques.

I have come to such a conclusion in the discussion with the old man.

(Oh, ...... that's how it is. ......)

How can we make Reiko recognize the force more accurately? I've got an idea.

(I didn't think it through enough. ......)

Reiko's power level needed to be controlled by finely controlling the output of the ether converter and the mana driver, as well as by controlling her magical muscles by millimeter or even microns. And all this while moving at speeds dozens of times faster than human beings.

Reiko herself could not explain to Jin why she had to do so.

"What's wrong with ...... Jin?"

"He must have realized something important."

Jin began to think for a few minutes. Saki and Reinhardt were whispering.

"Well, Reinhardt sometimes does that too. He is a professional idiot, I guess.

"I don't want Saki to be the only one to say that."

Jin then came back to reality.

"Thank you, Saki!　Your words are a big step forward for me!

Jin thanked her loudly, to which Saki replied with a puzzled look on her face.

"I don't know what it is, but I'm honored if I could be of help. I don't know what it is, but I would be honored if you could help us understand it.

"Yes, of course!　Reinhard, I'd like to hear your opinion too.

With these words, Jin began to explain the control theory he had just come up with.