The magic formula in my brain is drawn in unfamiliar letters, and if I can't read it out loud, I can't use magic.
　This is why I am learning the magic letters from Dia.
　There are thirty-six different types of magic letters, and after learning their sounds, I'm learning the ones whose pronunciation depends on the sequence of the letters.
　Anyway, I'd like to know the meaning of the magic letters as well as their pronunciation, but apparently I can't understand that even if I ask Dia.

If you don't know the meaning and regularity of the magic characters, there's no way you can write a new formula.

By the way, Dia is a really good master.
　Her pronunciation is beautiful.
　It's heterogeneous compared to the major languages of this continent, and she can read sounds that are difficult to even express in writing without hesitation.
　And you understand again what it means that the person being taught is important. When it comes to pronunciation, it is very important to know who is teaching you in the beginning. If poor pronunciation is ingrained in your body, you will have a hard time correcting it.
　There are thirty-six magic characters, and a hundred and fourteen different patterns that change in pronunciation with special combinations, and I'm asked to listen to all of them.
　After Dia read them out loud, I recited them all.

'How can you remember them after hearing them once?
'I'm confident in my memory. My tongue hasn't quite caught up with it.

The acquired know-how to strengthen my memory existed, and I was doing it as a matter of course.
　Not only that, Touahade's eyes continue to overload my brain with an overwhelming amount of information due to being able to see too much. I, who possessed [Super Recovery] and [Growth Limit Breakthrough], had evolved my brain to withstand that load.
　In addition, in terms of language acquisition, I had a taste for ten languages in my previous life, and here I have a taste for two languages in order to read materials in my study, so I know how to get the hang of it.
　However, my own pronunciation and Dia's are still not as good as they should be. I can't use my tongue because I use muscles I don't normally use.

I don't agree with that. I worked so hard on it. Anyway, as soon as you can pronounce the letters, you can start chanting. There's only one magic the rogue can use, so I'll read that first.

Dia goes to the trouble of making the first magic of the soil. She writes out the magic that creates the lead and slowly traces it out with her finger, pronouncing it. Then the lead is produced from his palm.
　He urges me to try it next time.

I nod and read it out loud.
　I manage to form and produce the lead. I watched me and Dia's magic activation with Touahade's eyes, but after all, there is a lot of magic loss compared to Dia, and the lead produced is also distorted compared to Dia's square, this one is distorted and small in comparison to the magic power consumed.

When practicing, you should check the magic loss with your eyes every time. By doing so, you'll be able to get closer to the correct pronunciation.
　There's no doubt that I'm inexperienced, but there's no guarantee that Dia's pronunciation is perfect.

'So this is magic, this is fun.

It's tedious but interesting. I want to use more magic.

─ Yes, the first time I used magic, I was very excited too. ─ Yes, I was excited the first time I used magic too. That way you'll be able to think of new magic.
'That's it, but I don't need to wait for the magic to come to my head, I can use it by reading out what someone else has transcribed for me.　If I read the jutsu with all my magic, it will trigger it, right?
Yeah, I guess so. Do you want me to try it?　I'm going to write one earthy magic that Lugue doesn't know about.
No, we can just activate it.

The length is almost the same as the surgical procedure just now. .........or rather, it's ninety-five percent the same magic method. He must have chosen that kind of magic with care to make it easier to chant.
　The magic was completed.
　The same metal is created as before. This time it's iron.
　Perhaps because the metal that is produced is different, the amount of magic power consumed has increased.

'Oh no, we really did it....it's so strange. If you ask me, it's so obvious, why didn't anyone come up with that idea before?

What I said is a natural idea. The lack of that natural idea may be because, perhaps, in this world, you can only use the magic formula given to you by God. ........That rule may have an effect on the system, and it may be that no one other than [the one who weaves the formula] can 'have such ideas'.

And having invoked the iron and lead formula, there was one inspiration.
　Ninety-five percent of the time, the formula for creating iron and lead is the same formula.

So it would be natural to think that the five-minute part of the difference specifies the metal to be produced.
　...Isn't it possible to create the desired substance by rewriting this fifth part?
　But even if I know the difference, I still don't know how to rewrite it. We don't know what the magic letters and formula are.
　Still, there is a way to identify them.

'I have a favor to ask of Dia. I need you to write down all the magic formulas Dia knows, demonstrate them, and show me how they work.

We analyze the various magic formulae and their effects by linking them to each other.
　However, it is more efficient to compare the effects of multiple magic methods and see the similarities and differences between them in order to understand the meaning of the magic methods.
　As the number of samples of magic increases, the accuracy increases.

"Do you realize how hard I'm asking you to do this?
'But I still want to ask for it. If you look at the iron and lead formulas and compare them, you'll find that they're almost identical. The slightest difference between them changes the metal they produce... then if we look at more magic formulas and see the similarities and differences, we can identify the meaning of the magic formulas. If we know what it means, we can rewrite it and create a new magic formula. I'll thank you, please.
Well, all right. I'll make sure I'm rewarded. But I don't want to thank you. It's a very exciting time to unravel the meaning of a magic formula and create a new one. I want to make my own magic too.

I start working on it right away.
　I asked them to write down all nine of Dia's usable earth magic and seven of her fire magic, explaining their effects and even having them demonstrate them while recovering their magic power after a break.
　Once those are done, the two of us will find the common parts and differences between the techniques based on their effects.

.........Her mind is extremely fast. Even more than that, her intuition is terribly good and she has a lot of ideas.
　She found out some regularities that I had overlooked.
　And as we discussed the regularities together, new ideas would come to me. I found myself so engrossed that the sun was setting.
　This time is inexplicably fun. Suddenly, I looked at Dia, her eyes sparkling and leaning forward to talk about her own theory, and I thought it was cute. I've never felt this kind of emotion before.

'Lug, are you listening to me properly?'
Yeah, yeah, I'm here.

I stammer, embarrassed to have been fawning over it.

'Here's the difference between lead-generating magic and iron-generating magic, but I think there's a number on it. Look, these three techniques, if this is a number, it would make sense. The numbers are 11.3, 327.5, and 207.2 for lead, 7.8, 1540, and 55.8 for iron. I don't know what they mean. If you don't know what the numbers mean, you won't know what to write into them.

If you ask me, if the magic letters are numbers, there are parts of the other techniques that make sense.
　Besides, the numbers on lead and iron are never appropriate.

11.3, 327.5 and 207.2 for lead, 7.8, 1540 and 55.8 for iron... how can this be a coincidence? Well noticed!　Can you make a table of replacement numbers and magic letters?
You can do it. Here you go.

Looking at the table that Deere made for me, I modified the technique for creating the lead.
　11.3 to 10.5, 327.5 to 961.9, and 207.2 to 107.9.
　I only changed three numbers.
　But if my assumptions are correct, you'll get the results you want.
　The chanting began, the magic was completed, and the silver cube was born.

It's silver!　I've never heard of any magic that creates silver.
That's what I thought. Those three numbers were the parameters for the metal we were going to call.
Could you make it a little clearer?
The three numbers refer to specific gravity, melting point and atomic weight. So if you take the parameters of lead and make them parameters of silver, you get silver.
I don't understand any more...

Excitedly, I altered it to two more techniques.
　I performed both of them.

''Ha, I got it. Titanium and tungsten, which I didn't think were available in this world. ........I'm pretty sure there was a magic that could transform metal at will.

Quickly, I chant that one.
　I shape the titanium into a knife and swing it at a tree in the garden. It's nice and sharp. Above all, it's light.
　At a time when weapons were being made from impure iron, it was possible to make a knife of titanium that was slightly inferior in hardness to iron, yet 60% lighter and extremely resistant to deterioration.

Next, tungsten. An extremely powerful metal of super weight and super hardness, and an extremely rare metal. As long as it has magic power, it can be made as much as you want. ...This would be a tremendous weapon.

'Yeah, just as you can imagine. Each of the three new magics will produce silver, titanium and tungsten. Try chanting Dear too.
'Yeah, I'll give it a go. ...Oh, I really made silver, I can't believe it.

Dia is surprised that I actually tried it.
　But for me, there's something that's bothering me.
　In order to create my own magic formula, I should need [the one that weaves the formula]. If Dia could chant the new magic, wouldn't she have needed this skill?　He almost regretted it.

'Hey, Dear. Wouldn't you like to try to generate money this time?　I would know the parameters of gold.
'Oh, I want to. I'm going to try to set up my own magic formula. If I know the gold parameters, I could do it too!

That's when Dia finished modifying her magic with the numbers I taught her and started chanting.
　Suddenly, she turned bright blue and collapsed on the spot.

''Are you okay, Dear!
Ugh, yeah I'm fine. I got a really bad headache and nausea all of a sudden.

I look at the formula and it shows the specific gravity, melting point and atomic weight of gold.
　In fact, when I wrote down and chanted the exact same magic formula as Dia, gold was born.
　.........So this is what it means that you can't create a magic formula unless you are [the one weaving the formula].

Even if someone other than me modifies the formula and creates a new one, it will be rejected and cannot be chanted.
　However, if it's a jutsu that I created, other people can use it as well.
　This is just an assumption. If I could, I'd like to test it out.

"Dear, if you don't like it, no, I don't have to do it. I wrote down the exact same formula on a piece of paper as Dear. I want you to read it out loud. I need it to discover the conditions under which new magic can be created.
That's not fair. I can't help but be curious when you say that.

The blue-faced Dia chants the magic formula I wrote down.
　Then the chanting ends smoothly, and gold is born. It's the exact same formula.

It's strange. But this means that if I create a new spell, I can use it by having the rogue write it down once. This burns. More regularity, more digging up the meaning of every sentence!　Then we can make more awesome magic!
'I think we're on the same page. Why don't the two of us split up the regularity and meaning identification?　Then I don't have enough samples of magic. I'm going to try to learn some new magic by using all the water and wind that Dia can't use. Dia, take fire and earth, please.
Of course!

We both take a firm hand.
　The new technique should be a secret, and there was no way I would have asked Dia to help me with it the first time.
　However, Dia is excellent, so we'll make much more progress with her help. In fact, if it wasn't for Dia, I wouldn't have realized that the difference between iron and lead was a number. Or it would have taken more time to identify it.
　...More importantly, I'm enjoying doing this with Dear. I'm helplessly happy to do it. So, as a rogue, I do.
　With this, I could carve the first step in creating a new magic.
　We can't just vaguely develop a new magic formula.
　Let's make a goal first. Then all we need is some magic to create an explosion, and we can make a gun.
　And that too, as long as the magic power has an infinite number of bullets and an accuracy comparable to that of the previous world.
　A weapon that has both range and destructive power, and furthermore, a weapon that can be retrieved at any time while wearing empty hands. Nothing could be more suitable for assassination. I'm going to make it happen.

Dia and I were more excited than I'd been since I'd arrived in this world to see how far we could go.