I take a bath with my sister Rosalia. At that time, I suddenly had a thought.

Come to think of it, is there such a thing as a magic circle that produces water? it’s a magic circle that’s essential for making showers. What if It doesn’t exist in this world?

I asked the servant who was accompanying us to help us with our bath.

“How do you store the water for this bath?”

“We use a magic tool that produces hot water for the bath.”

“There is such a thing. Is it an expensive magical tool?”

“Yes, it is. I don’t think there are that many families among the nobility that have them.”

It exists, but it is not common. When we get out of the bath, let’s see the magic tool. If they let me take it apart and look at the contents, I should be able to get a general idea of what the gist is.

Depending on what I find out, I might have to reconsider the design of the shower tool.

“What is it, brother?”

“Oh, I just had an epiphany about the magic tool.”

“Ufufu, Oniisama really likes magic tools.”

“I guess so. ……”

I’m stumped. Personally, I prefer to make magic potions over magic tools. There are a few materials I haven’t tried yet, and there are a few I didn’t know about in the magic potion material encyclopedia. I can’t wait to get them and try them out.

After washing our bodies and getting warm enough, we got out of the bath together. After wiping myself with a towel, I changed into my nightclothes and was immediately shown the magic tool that produces hot water. Of course, Rosalia came with me.

“This is the magic tool that fills the bath with hot water! It’s huge.”

“I didn’t know there were magic tools this big. It’s amazing!”

It’s certainly amazing, but it’s not portable, and to be frank, I think it’s a nuisance. But it was nice to see this beforehand. If it had been constructed with hot water coming directly from the shower head as originally planned, it would have been revolutionary.

This is something I should look into more about the magic tools of this world. I had thought that since my main job was to make magic potions, I wouldn’t need much knowledge about this world’s magic tools, but apparently that’s not the case.

A magical tool made on a whim could become the source of a great commotion. I underestimated the in-game knowledge. I almost made a mistake.

“May I open the inside for a moment?”

“Eh? That’s a bit ……”

The servant hesitated. That’s right. If a nine-year-old kid wants to disassemble an expensive magic tool, that’s what he’s going to do. But I had to persuade him somehow.

“It’s okay, all you have to do is remove the steel plate that covers the outside of the device. I’ve made a ‘magic star tool’. I know more about magic tools than the average magic tool masters.”

“ I understand, but please don’t break it.”

I managed to get permission, albeit reluctantly. I quickly removed the steel plate surrounding the outside and peeked inside.

Hmmm…I see…I see. I wondered if the slowly increasing water was a magic circle that produced water? It looks like they are using a magic circle that heats the water there to make hot water.

But the speed of hot water generation seems to be slow, and it seems that hot water needs to be stored in a large tank. Is that why it is so huge?

After analyzing the magic tool, I put the steel plates back in place.

“Thank you. that was very helpful.”

It was over so quickly that the servant looked at me with a puzzled look on his face. I didn’t need to go into the details of the structure. All I needed to know was what kind of magic circle was used. Rosalia, who peeked in with me, looked at me curiously. I guess she still doesn’t get it.

I returned to my room and decided to rewrite the blueprint. I decided to change it to a method of storing water somewhere, just like the magical tool I had just seen. Yes, I’ll have a pool built in one corner of the training ground. I would have them store well water there and heat it up only when needed.

Then the magic circle that heats the water would be enough and the fire power could be increased so it could be turned into hot water quickly.

Instead of directly heating the water with a shower head, prepare a smaller tank one step before the shower head, and build a heating magic circle into the tank to turn the water into hot water.

It would be a slightly large facility, but it would be fine for use by the Knights. We also need a magical tool that acts like a pump to send water to various places. Let’s say we make a magical tool that spins a blade with the power of wind and sends water out. This is turning out to be a lot more work than I thought.

“You seem somewhat happy, brother.”

“Is that so? I think I’m going to be a little busy.”

“I’ll help you, too.”

I patted Rosalia on the head. I can’t help it. I know I shouldn’t, but I just can’t help it. As I looked at the smiling Rosalia, I realized that my own cheeks were loosening too. My sister really is cute.

“Big brother, it’s done.”

my younger sister, who had been eagerly drawing the magic circle on the steel plate from a while ago, looked up. Her face was a mixture of anticipation and anxiety.

“Well, let’s see… ……Yeah, this looks fine. Let’s try to get a light on it.”

“Can you do that?”

“Yes. even if it is not in the shape of a lamp, you can make it glow.”

After saying that, I took out a small magic stone and placed it on the iron plate with the magic circle drawn on it. After a while, the magic circle began to glow slightly.

“Wow! It glowed, brother!”

Rosalia clapped her hands and started jumping up and down. Rosalia’s personal servants in the room also looked on with wide eyes and hands over their mouths.

The precision of the magic circle and the small size of the magic stone make the light intensity weak, but it is still a fine “lamp magic tool.

“You did a great job, Rosalia. The lamp magic tool is an improved version of this magic circle, devised to be easier to use.”

“I see. Then, the ‘star magic tool’ as well?”

“Yes. It’s just that we made it more luminous than this magic circle and put it in a container that makes the star pattern appear in the dark.”

“It’s amazing that magic tools can do such things.”

Magic tools can be made in a variety of ways, depending on how you think about it. That may be the interesting part. It’s the same with magic potions.

It was hard to calm Rosalia, who was still excited, but I managed to get her to fall asleep.

Of course, Rosalia was sleeping in my bed. It seemed that she had decided to sleep with me while everyone else was away in the royal capital.

I have a feeling my parents would be furious if they found out, but I wonder if it would be okay.