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　Suddenly, Jin felt a gaze.

　Looking to the side, he saw Erza staring at him with a slightly puffy face.

"Well, what do you think of these tools, Erza?"

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　It was a terse line, but Elsa put her puffy face back on and opened her mouth.

"Are you worried about a fire?"

"Yes, I'm sure that's a concern."

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　When laundry is hung on the stove to dry, it is fine when it is wet, but when it is dry and light, there is a concern that a slight breeze ...... or updraft caused by the heat from the stove will cause the hangers to slip off and fall on the stove, causing a fire. The hanger may slip off and fall on the stove, causing a fire.

　Those of us who have heard of such accidents with the old-fashioned <> must be cautious here.

"Martha, Hannah, what do you think?"

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　Jin asks the two who can imagine the benefits of such a <.

"Well, yes, if we had such a thing, we might cook with it.

"In winter, it's hard to dry clothes, so we hang them inside the room too.

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

　Jin thought about it.

　For a moment, silence reigned in the room. Not a single sound was made so as not to disturb Jin's contemplation.

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　Then Jin slowly looked up and opened his mouth.

"I think I can do it if I don't get greedy.

"Really?　Jin, I'd like to hear your thoughts. I've got a few ideas of my own.

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　Reinhardt said smiling.

"Okay, here we go. ...... Well, I was thinking that we could heat the room without using a lot of heat."

　Engineering magic<. If you control it well, you can regulate the temperature.

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　If the temperature is not high enough to cause ignition, but only about 60 degrees Celsius, for example, fires can be avoided.

"But you can't use it for cooking, though."

　Most of the oil stoves Jin knew could be used for cooking with a kettle or pot on top, but that was a double-edged sword.

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　If you can boil water, there is a possibility of starting a fire.

"I see. That's a very Gin-like idea."

Tell me what you've come up with, Reinhardt.

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"Yeah. ...... I was thinking that we could add a function to detect overheating."

　"We could turn off the heat when it gets to a temperature where it could catch fire," Reinhardt said.

"That's a good idea. The downside is that the unit cost would be higher."

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　Reinhard nodded at Jin's criticism.

"That's true."

"I see. That's a good point.

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　Stearina looked pleased.

"I see that both of your ideas have their own advantages and disadvantages. I guess that if you want more functionality, the cost goes up, and if you want less cost, the functionality is limited. ......

"Well, yes. Well, it can be solved to a certain extent by making some improvements, but fundamentally it is difficult to do so.

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　It is even more difficult because the functions may conflict with each other.

　The two functions of preventing a fire and cooking are usually not possible at the same time.

　If we try to make them work, it is inevitable that the complexity will increase and the cost will rise.

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"Martha, Hannah, which one should I put first?"

"Well, I guess. We already have the tools to cook in the first place, so what does it matter if we can't cook?

"Fire is dangerous!

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　In a sense, the two representatives of the common people were in agreement.

"We clean while drying the laundry, and cook while doing the laundry. If someone stays with you all the time, it would be good to be able to boil and cook.

　Martha added.

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"I see. Thank you, Martha. That's very helpful.

　Reinhard thanked Martha. This kind of opinion from another point of view is welcome, even if it is not Reinhardt's. "I'm glad to hear your opinion," Martha says.

"...... is good for this kind of thing."

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　Bina said.

"Until I met Jin, I was alone. Now that I've met Master Luis, I'm not alone anymore. But when I'm working on magical engineering, I'm still alone.

"Beena ......"

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　Jin was speechless at this unexpected monologue.

"Oh, I understand. Developing alone is free and carefree, but sometimes it can be lonely. It's lonely when you don't have someone to talk to, someone to ask ......."

　Stearina agreed with Bina's words.

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"Hmmm... I guess that's the way it is. It's the same with research, I guess.

　Toa casually hugged Stearina's shoulder.

　Marcia seemed to agree,

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"Yes, I agree. Being alone ...... has its good and bad sides, but I think it's better not to be alone.

　He said as if muttering to himself.

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"Well, let's get back to the topic."

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　We were getting a little sidetracked, so Jin rejoined the discussion.

"So, I guess that would be for safety."

"Eaakon?"

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　Someone asked back, as if not understanding a word Jin had just uttered.

"Oh. It stands for <>, also called <>. In short, it is a device that regulates air, that is, temperature and humidity.

"I see, <>. In other words, to make it warm when it's cold and cool when it's hot.

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　Reinhard nodded and said. Jin affirmed that he was right.

"So, the wind would be more efficient?"

　Erza said. Certainly, if the heat source is not high temperature, natural convection cannot be expected.

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　It would be better to generate airflow to circulate the air, just like air conditioners in home appliances.

"Well, then, it should face downward to heat and upward to cool!"

"What, Hannah?"

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"Because warm air goes up and cold air goes down, isn't that better?"

"No, that's right, but..."

　Jin is impressed by the fact that Hannah is taking scientific knowledge into her own hands.

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　Jin wondered if a modern Japanese elementary school student could make the same kind of decision as Hannah.



　After about an hour of discussion, the concept of <> was completed.

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　It is about the size of a household fan heater.

　The air conditioner can switch between cooling and heating, with the air blowing upward for cooling and downward for heating.

　It is not possible to control the temperature, but it is possible to adjust the relative temperature, such as <><>.

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　The air volume is also infinitely adjustable from low to high.

　The most important feature of this product is that it can be supplied at a low price.

　It works with Magi Stones instead of Magi Crystals, and one standard Magi Stone can be used for about one month (10 hours of operation per day). .

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"I didn't know there was such a way to conserve magic power."

"Ah, as expected of Jin!"

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"That's what I'd expect from a Magecraft Meister!"

　It's the result of eliminating the effect of the <> magic used in the air blowing part to eliminate the recoil.

　To complicate matters, normal wind magic has no recoil. This means that no matter how strong the wind is, you will not feel any recoil.

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　This is because the effect of canceling recoil works automatically, and if this effect is removed, the consumption of mana can be dramatically reduced instead of feeling the recoil.

<

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　Let me digress.

　The recoil of a blast of air is not enough to move the main body, and by not canceling the recoil, the consumption of mana was reduced to one-third of its original amount.

　At the same time, <><>, by narrowing the temperature range, the consumption of mana could be reduced to half.

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　This will make it a magic tool that even ordinary people can afford.



"Why don't we distribute it to various countries as the <>?"

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　Guth says with an idea.

"Yeah, that might be a good idea!"

　Reinhardt agrees,

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"Certainly, it would be a good idea to start up the as a proof of reliability.

　Licia also agreed.

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　Thus, it is up to Jin and the others to decide whether or not the <> will be introduced to the world after this .......



　By the way.

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(Actually, we wanted to popularize <>, but it's difficult to do so without Japanese-style architecture. ......)

　), Jin was secretly disappointed.