"umm."

"......"

Jin and Elsa were still struggling.

"It would be relatively easy if the shape were fixed."

The plasma sword, for example, is able to maintain its warding in the shape of a sword because it has a specific shape.

"Barrier or ...... wait?"

"Brother Jin, barrier cushion car!"

Both of them seemed to have an idea.

"Maybe we can just protect it from pathogens..."

A soft barrier.

What?

What?

Both of them seemed to have come up with slightly different ideas.

"Uh, let's start with Erza."

"...... from my brother Jin."

"Oh, yeah?"

Since there was no point in arguing at this point, Jin spoke up with an idea.

"I thought, we don't have to stick to the existing barriers, we can create a sterilization barrier.

In other words, a barrier that sterilizes anything that comes within its area of effect.

"I see.

Erza nodded her head and Jin asked her a question.

"What is your idea?"

"A flexible barrier, like the one used in the barrier cushion car, that shrinks."

"I see. ...... Then, depending on the setting, a barrier could be formed along the surface of the body."

"Hmm."

Jin and Elsa started discussing again. The old man joins them.

The old man says that it is feasible and reliable.

Neither Jin nor Elsa have any objection to that. In fact, that is what we were going to do.

The problem is the applicability of Elsa's idea.

"...... so if we generate another layer of barrier based on the barrier along the surface of the body. ......"

"That's right, Brother Jin. That's exactly what I'm talking about."

In other words, it is a change of mind.

Weak barriers are deformable. The barrier cushion car uses this property to absorb the unevenness of the ground.

If we shrink the size of the barrier surrounding the subject, it will eventually come into contact with the subject's body.

What happens if the barrier is further shrunk?

If the barrier is of the type that allows air to pass through, but not solids, it will begin to deform. Along the subject's body.

If the subject is wearing clothes, it will also follow the surface of the clothes.

"This barrier is, of course, caused by the action of <>."

Jin explains to Erza, as if checking for himself.

"Hmm. So, we can use it as a starting point for another warding.

"Wow, Erza, that's great!　I hadn't thought of that idea.

Jin thought that if he applied this idea, it would be easy to create a multilayered ...... or even a composite warding.

<<

"So, if we apply Elsa-sama's idea, we can eliminate the error."

Reiko is also impressed.

Jin, Elsa, Reiko and the old man talked about the possibilities of this method for a while, but then they decided to pursue their original goal.

"Let's start with the sterilization barrier.

"Hmm, that's the right way of thinking," said Jin.

The idea is that simpler is better if it can produce the same results.

"Autumn's razor, was it?"

The correct answer is <. It is also called .

The idea is that a simpler solution is better if it can produce the same result.

When explaining a law, it is a razor blade in the sense of cutting off unnecessary things.

I'll leave you with a quiet word.

I would like to bring Milowina here, but I think that Ars is full of germs that she is not resistant to.

That is why we are trying to develop a sterilization barrier.

"I wonder if we also need to consider bacteria inside solids."

I mean food.

<>

The old man is talking about fermented food.

"It will be fine. Eating them will not increase the amount of bacteria in your intestines.

The same goes for liquids. But we have to make sure that it has no effect inside the organism, otherwise it would sterilize Milowina's own intestinal bacteria and so on.

"Elsa, what do you think?"

"...... can do it, I think."

Erza wrote down the flow of magic control (magi sequence) on a notepad and showed it to him.

"Yes, I see. This should work. Except for healing magic and the like, magic can't affect a living body.

"That's right. Healing magic is special. But sterilization as an engineering magic can be found at ......."

Originally, it had no effect on the human body.

Thus, the <> was completed that evening.

It is a pendant type, worn around the neck.

"This looks like it would be effective in surgical operations.

"Yes, indeed. Shall I take it to Dr. Sali?

In that case, it might be a good idea to make it a little more versatile, so it can be sterilized around the room.

"I see."

He even completed a more advanced magical tool, the Sterilizer.

"Now we have a chance to call Milowina-san.

"I think Dr. Sally will be pleased with the sterilizer."

Satisfied, Jin and Erza decided to have dinner.

"...... could not prepare it again tonight."

Meane took over tonight.

"Thank you, Mother."

"No problem. You were busy with Jin-sama and other things."

Barley porridge, omelet, fried white fish, vegetable soup and fruit salad.

"Mother's cooking is delicious."

Elsa has learned to cook from her mother, but she says she can't get the same taste.

"I guess there is a difference in age," she says.

"Hmm, that may be so.

At Jin's murmur, Meane agreed with a smile.

"I'll do my best ......."

"Yes, do your best."

Meine teased her daughter with the composure of an older woman. The bond between mother and daughter was palpable.

It is a secret that Jin felt a little envy when he saw them.