"What do you say, Gran? Is it possible to reproduce the Kuo Sword?
"... * giggle *. I have to say, it's very difficult at the moment, Ars."
"Can't you? This flame ore is the ingredient of the Nine Tails Sword, right? There will be no other unusual ore that responds to magic and flames will blow out....."
"This flame ore is not the problem, Ars. The problem lies in the properties of this flame ore."
"Characteristics? That's the unusual characteristic of flames, but what's the problem?
"That's not true. It is not a problem for the flames themselves. However, the hardness is definitely insufficient. This flame ore is not too soft, Ars."
"Soft? It wasn't as if it was in my hand, but isn't it hard?... oh, I see. If it is soft, it is not suitable for the sword."
"That's right. This will not be used as a weapon, even if you process flame ore into a sword."
"But there is a nine-tailed sword that can actually be used as a sword, Gran. It's definitely not impossible to produce."
"... that's right, Ars. Awkward, it's on fire. Anyway, I'll try to recreate this nine-tailed sword. So I would like you to wait a little while until it is completed."
"... hey, Gran. It's a bit hard to say in a tight spot, but can I ask you something?
"Why, Ars. Do you have any idea how to make it? I wonder if it is mixed with other metals, but should I increase the temperature of the furnace when processing flame ore, or..."
"Ah, stop, Gran. I'm so excited."
"Oops, I'm sorry about this. So, I wonder why. Was there something Lord Ars wanted to ask me?
"Oh, that's not a question, it's a simple question. It means to reproduce the Kuo Sword."
"... what do you mean? Ars went out to Uruk looking for flame ores, didn't he? It's a little hard to understand that you don't need the Kuo Sword suddenly after you actually get the Flame Ore."
"Well, I'd appreciate it if you could mass produce a magical sword called the Kuo Sword. But you don't have to stick to that. A nine-tailed sword with an irresistible flame sword. That may be very strong, but the knights who use it are capable of ranged attacks. Even without a nine-tailed sword, I don't think the attack force itself will change that much."
"But, Lord Ars. Even if you say that now, this is how you got the Flame Ore. Then, if you don't make the Kuo Sword, your struggle will end in prison."
"Not necessarily. The point is, it's not just the use of flame ore that's limited to weapons, me. I'd love to study how to make the Kuo Sword, but let's make something else, Gran. It seems like there are many ways to use it."
"Is there any other way to use it...? But even if they ask me how to use the flaming ore... Yes, why don't we use this flame ore to build a furnace, Ars. It might be interesting to try to build a furnace with a higher temperature than ever before."
"Oh, that's nice. That's what it is, Gran. That's what I wanted to say. I also have something I'd like to try to make with flame ore, Gran. I want you to make something."
"Would Ars like me to make it for him? This doesn't look like a challenge. What is it, Lord Ars?"
"It's empty. Let's fly into the sky, Gran. Let's use Flame Ore to make flying tools."
"... what? Fly... through the sky? I don't know what you're talking about, Ars. How do we fly in the sky with flame ore? Aren't you forgetting that it's a flaming metal?
"No, no, that's fine, Gran. Flames come out without fuel. I can make balloons right away."
I was talking to Gran in Vulcania.
He was taking back a flame ore called Phantom Metal in a place called Fox Valley in the Old Urk Territory.
I was talking to Gran about the flame ore.
In the meantime, when I heard what I said, Gran looked at me with a face like what he was saying.
This means that Gran may never have seen a vehicle with a flight capability.
But I'm not.
When I saw the flame ore that came out in response to magic, the first thought was not to use it for the Nine Tails Sword.
From my point of view, the flame ore was only visible in the energy generator.
It's a mass of thermal energy.
Thermal energy.
It was the greatest benefit to human history in the world of the last life I knew.
And it was the driving force behind the change in the world.
For example, the industrial revolution by steam engines.
However, the steam engine was not the one proposed to Gran this time.
While there is a perception that flame ore is used for the Nine Tails Sword, it would be better to have more impact when you look at it at a glance if you are looking for other ways to utilize it.
I thought so, and I decided to create an impact where people can only move over the ground and fly through the sky.
Well, since the flame ore is mine, it doesn't make sense for people to complain about using it for anything.
To be honest, it's totally my hobby.
Thus, I taught Gran the structure of the balloon as much as I could remember, and began making balloons using flame ore.