That was shortly after I finished accepting the request for supplies and sent Sylvia out the front door of the store.

Alexia climbed the slopes willingly in a way that would be misplaced with Sylvia as she returned to town.

"None, Mr. Luke! This job is finally going to come to a close, so thanks for reporting!

"That was good. Is Noir going to be able to handle this?

"Of course it is. Because I'm the only one who's clean, I'm not running out. Noir should be here later."

The work that Alexia and Noir had entrusted to them, or Oswald of the Grey Eagle Knights, had requested, was the development of cold gear to help the knights of the North.

He had asked me to make prototypes out of skill, magic props, and each approach, but he had achieved a certain amount of results early on.

"What the hell did you make?

"Here's the prototype. I'll tell you more when Noir arrives."

Alexia laughed proudly when she showed her palm-sized parcel.

Then, after a while, Noir also came to the store, so I decided to take him back to the room where I had been talking to Sylvia until earlier to hear the report.

The 'prototype' they brought seemed easy to get into their pockets, both sizeable enough to fit in a wrap the size of their hands.

"You're surprisingly small."

Frankly speaking of thoughts that came to mind, Alexia made me try to catch the edge of her mouth just to get my will.

"Based on the information we received, we discussed it, but if we wanted to meet the conditions presented most efficiently, it would still be best to finish 'a heat source with sufficient temperature to last' at a size that we could easily carry around."

Indeed, if we integrate the required specifications of the Grey Eagle Knights as they are, it will be exactly what Alexia said.

"But isn't that too small for you? What I imagined was a lantern-sized fireplace."

"The idea originated with Sakura's hot stone. The Knights of the North have already taken adequate measures, and I thought it would be a good idea to warm up the cold in a focused and flexible manner if they were still lacking."

That's why the small, lightweight emphasis.

So I weighed in on reinforcing the inadequacies in the current measures by breaking it off that you don't need to warm your whole body up with one tool.

Alexia finished explaining her overall design policy and urged Noir to go into individual explanations from there first.

"Well... from me, then. This... is just a magic prop, made... prototype..."

What Noir removed from the package was a square, flat bag the size of which was not so different from the outer packaging.

It can be seen at a glance that the sides are securely stitched and do not envisage removing the contents.

"Hey, what's in it... like this... in the wind..."

Now only one piece of the four sides is taken out of the unstitched sachet, the contents of which are spread over the table.

What was inside was a bunch of paper slightly smaller than the outer bag.

There are magical patterns on all of them, but if you look closely, there are two types of patterns, and they overlap each other.

"Hey, is this a heating curse?

"... oh, oh... a lot, and I have an idea... I do..."

In his usual obsessive tone, Noir began somewhere fun to tell how the prototype had come to its present form.

At first I started thinking simply, by carrying a heating curse, a magic that takes warmth, but there were about two major problems.

First of all, physically it's just a piece of paper, so one thing that's troublesome is carrying it away from gushing it.

And the other thing is, in spell size, there were fundamentally performance limits.

When the touched part makes the output feel hot enough, it quickly collapses at its limit, and vice versa, when the output is suppressed to last longer, it does not feel warm at all this time.

With this in mind, I tried to bundle multiple spells next, or fold something larger, but now I have another problem.

Closely folded, it could occasionally ignite and burn up whether the magical action or the heat generated was too concentrated in the extreme.

Exactly. Hazard of natural ignition. Not constituted as a commodity in ants.

Spellscrolling, the prototype, 'cannot be used without opening the scroll', is also intended to avoid these accidents.

However, Noir did not intend to abandon this approach.

After thinking about countermeasures, I came up with the idea of pinching a control curse to prevent natural ignition between the heating curses that I had bundled.

"A, Idea's, originally... Sylvia cooked... when... hot, pot... pot laid, on top, I put it... because I saw it..."

Prevent the inconvenience caused by the propagation of high heat by pinching something between them.

The principle itself became completely separate from pot laying, but the structure to prevent natural ignition, he said, came from such a routine sight.

The last remaining problem was that just as the finished spelling scroll collapsed and became dust, so did this prototype become dust when the fever time was over.

It's inconvenient to use in your pocket or pocket, but the solution to this is very simple, and as soon as you start thinking about it, they settled down in the form of 'you just have to put it in a bag'.

"Try... look, give me... Let the magic flow, then… fever, from…… to…"

"Like this?... Whoa, sure."

A twitch of heat is transmitted over the fabric of the sachet.

The only part that warms up is the one you touch directly, and if you let it go, it won't warm up at all, but it's perfect for what you're holding in your hand or putting in your nose for use.

Most importantly, it's more compact and lightweight than I imagined.

Even if I put it in my pocket and explore the dungeon, it fits in a size that doesn't bother me at all.

"... what... improvements, or... are there likely to be...?

"If you insist, you might be concerned about solidity when you bend it because the contents are a bunch of paper. Are you saying it's a little messy... can you even make a spell out of cloth?

As soon as I casually said that, Noir raised his face haha and let his eyes shine, answering in a lively way from the bottom of his heart.

"Oh yeah......! Normally, there are no advantages, so... I don't... but... cloth, scroll, can...! Next, so... prototype... let's see...!