"Well, now let's think about what sells.

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"Well, as Jin said, we have to think about the people who are going to use it.

Bina seemed to be getting the idea.

"I'll see what I can do."

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Jin then remembered something he had been thinking about but couldn't make.

"Hey, Beena, it's warm around here, isn't it?

"Yes, it is.

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It doesn't snow either, does it?

"Yes, I've never seen snow in person either. I've only seen the mountains in the distance turning white. So what?"

Jin tested Bina,

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"Hey, how long do you think those persica nuts will last?"

"What?　"Well, they're ripe, so I'd say two days at the most.

Bina answered,

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"Can't you keep them longer?

Bina thinks for a moment, but then asks, "Can we keep them longer? Beena thought for a moment, but then her face lit up,

"I see!　A magical tool to preserve food!

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"Correct!"

Jin laughs too.

"Well, I haven't heard of such a magical tool before.

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Bina replies,

"In the first place, how do you preserve food?

"Well, we dry them or pickle them in salt."

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Then Jin said,

"In some regions where it snows, they bury vegetables in the snow.

Then Bina said, "They bury vegetables in the snow. Then Bina says,

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"I see, there's also a way to cool them down. But it's hard, isn't it?　Ice magic consumes a lot of magic power if you use it continuously.

Jin smirked at Bina,

"That's why, isn't it? That's why, isn't it?" "Isn't that why you have to try your hand at making such magic tools?

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He almost said "Magecraft Meister," but Bina didn't notice. Bina did not notice,

"I see. I'll give it a try! I'll give it a try!

Bina was so determined, but then she said,

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"Oh, ...... is no good. We don't have any more magi stones in stock. But I don't have the money to buy them.

She nodded her head and mumbled with a sad look on her face. To Bina, Jin said, "You can use this,

"You can use this.

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Reiko put two Magi Stones on the workbench, one with fire attribute and the other with earth attribute.

"What?　No, I can't let you do that to me.

Bina refused to accept them, but Jin said,

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"Then, I'll ask you to return it to me when the new magic tool is made and you make a profit from its sale. That would be good, right?"

"I'm going to be in debt again,...... but I'm going to have to take my chances. I'll be very grateful for the money.

"Okay, that's the way it's going to be. Let's think about the structure.

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To Jin, who knows what a refrigerator is, it seems half-finished, but not to Bina.

"Well, it should be a box. You put a lid on it so you can open and close it, and put vegetables or something inside. And then the inside gets cold.

"Yes, that's the basic idea."

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"The box and the magic to keep it cool are the two most important things."

"I agree. The box should be able to transfer as little heat as possible.

Jin said,

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"Why ...... do you say that? You only want the inside of the box to be cool.

Bina shows her sharp side.

"That's what I meant. That's why we'll make the walls of the box thicker, and if there's room, we'll put in a fire ward against fire."

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"Fire?"

"Fire? Did you know that warding against fire actually protects against cold?

In other words, it blocks heat. To Jin who pointed this out,

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"I didn't ...... realize that."

Bina looked at Jin,

"Are you amazing?"

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Reiko responded.

"Your father is the best in the world."

"Yes, yes. Yes, of course. Your father is the best in the world. ...... then the problem is the magic that cools him down."

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Bina flushes for now. And Reiko frowns. Hitoshi is going at his own pace,

"It's easy just to cool it down, isn't it?　There's magic to make ice.

"The easiest way is ice. That's what it is.

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Ice is a magic that freezes water and things.

"That's good, isn't it?　You make ice in a box, and when the box runs out of ice, you make more ice."

"Oh, I see!　That way, it doesn't have to run all the time!

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Beena's idea is becoming more and more solid.

"Oh. That's why ......"

When Jin tries to describe the flow of magical control (the Magi sequence), she says, "Wait a minute,

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"Wait a minute. Let me tell you. ...... ice creation, ice monitoring, ice creation, repeat. And the ice monitoring is to make ice when there is no more ice.

Thinking for a moment, Jin adds.

"That's right. I think it would be better to do it a little before the ice runs out. I think that's all we need to do.

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"Yeah, yeah, I think we can do that.

So we start by making a box. The basic structure is made of wood and reinforced with bronze in key places. The box was made vertically, in the shape of a modern refrigerator, and an ice compartment was built at the top.

"So this is where you make the ice?"

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"That's right. Because cold air goes down. Ice is basically at the top.

I envy your knowledge of such things, Jin.

And now for the important cooling part. The work of writing the magi formula on the plate.

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"Like this, like this, like this, like this..."

Bina writes little by little while racking her brains. This is of course done by magic.

"I think it would be better to do it this way..."

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"Oh, yes, it would be shorter that way.

<. Jin supervised Bina as he built up a decent Magi Formula.

"Okay, that's it. What do you think, Jin?

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Jin looked over the Magi Formula,

"Yes, I think it's good. This will give us enough time to make a simple warding inside the box."

"That's right. I've never known the difference in the consumption of magic power depending on how good or bad one is at using the Magi Formula.

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Then, the plate is assembled and the magi stone, the source of power, is set, and the machine is complete.

"It's done!"

"Good job! Let's try it now. We can put the Persica inside, right?

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Yes, that's right.

So we put the 12 remaining Persicas inside,

"Cooling".

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I let it work. After a short wait, I opened the door and found that ice had formed on the top of the inside of the box. This seems to work.

"Well, it will be night soon, so I'm going home.

"Really?　Thanks for today, Jin. Will you come back tomorrow?

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"Yes. Yeah, I'll see you then.

With these words, Jin and Reiko left Bina's workshop.

"......Ah."

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A while after Jin left,

"By the way, where does Jin live?"

No one answered Bina's question.

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