Satisfied with their success for the time being, Jin and his team began to consider a third prototype.

"I still think the image at a distance of 10 meters is a little too large," said Jin.

Jin said, "Hey, the image is still a little too big at a distance of 10 meters,

"Hey, why don't we make the housing telescopic?

Eira said, "Hey, why don't we make the enclosure telescopic?

"That's it!"

I had not felt the need for such a mechanism since the pinhole system does not require focusing, but it would be better to have such a function for experiments.

"Hmmm, I can't believe I noticed that in the third prototype."

Jin secretly reflected on the fact that he should not make assumptions.

Soon after, the third model was completed.

With the added telescopic function, that is, the function to change the focal distance, the perfect size of the magic circle projected at a distance of 10 meters was determined.

"It worked. The whole thing is a little elongated, but ......"

Increasing the focal length means increasing the overall length.

Modern Japanese telephoto lenses shorten the overall length by combining several lenses, but not so long ago, telephoto lenses were supposed to be long lenses.

But aside from that, once we have seen the initial success, the next step is to improve the performance.

"Hey, what if we cut the overall size in half?

Eira suggested.

"Then the projected image would be halved as well.

Jin said. Eira was encouraged by his words,

"I think we can make the whole thing more compact, but what do you think?

"The projection data will be smaller, so you won't be able to draw complicated magic circles.

"Oh, I see."

Eira's shoulders slumped at Jin's point of view.

"But we can get a small golem to draw it for us ......."

Jin immediately came up with a solution.

"Oh, I see!

"I see, that's one way to use it."

Groma noticed it again.

"Then, we might be able to reduce it to a quarter of its original size.

"But then, the projection distance would also be reduced to a quarter, so we need to think of a way to extend it, don't you think?

Ka?e?a advised.

"I guess so. Then we will need an even stronger light source than we have now ...... or not."

Jin realized that there was no need to quarter the light source.

This would make the light source part larger in terms of balance, but not so much that it is unattractive.

"If we use high-quality light-attributed magical crystals (magi crystals), we can make it a little smaller.

Taking these ideas into consideration, we decided to make a prototype of the fourth generation ......4.

The size should be kept to one-half, not one-quarter.

We can make our own <> at that size.

"That's it."

The projection was completed at 4:30 p.m.

The experiment in the large conference room was again a success, and Jin and the other four were satisfied.

* * * * * * * * * * *

"Let's call it a day. Thank you very much, ...... Jin-dono.

Thank you very much.

The reason for leaving early is that the results of the analysis of the will be announced this evening.

That is why everyone is having an early dinner and waiting for the results.

Jin also returns to the guest room and meets up with Elsa.

After a refreshing bath in the room, they had a room-service dinner at 5:30 p.m.

"......Did you do anything interesting?"

Elsa asked over a cup of after-dinner tea.

"Yes. I did this ...... thing."

Jin explained about the <>.

"Interesting."

"Isn't it?　It's very rewarding to do your best under such constraints.

Thinking back, when I was the only one sent to this era and had no backup from Horai Island, I completed Hope with the materials I had on hand. I felt a great sense of accomplishment at that time.

It was Jin who reminded me of that.

We need to remember it again and again. <

I understand how you feel. ...... then, I will."

Elsa also reports to Jin how the day went.

"Well, Najas is doing well, isn't he?"

"Yes, Najas is doing well. I heard that she has already caught up with the others.

"I see."

I was worried about whether she would be able to keep up since she was kind of a mid-career hire, but it seems that Elsa's education was a good thing.

"Hmm. Everyone listened to me attentively. I'm looking forward to the future."

"That's a good thing."

Jin thought, "I hope I can support the future development of this world from the shadows this time .......

At that moment, there was a lot of activity outside the window. It was 6:00 p.m..

For a moment, Jin wondered what was going on.　Jin thought,

"Oh, Makina has come back.

He immediately realized that "Oh, Makina has come back.

He decided to contact the old man through Reiko.

"Reiko, everything was all right, wasn't it?"

"Yes, father. Yes, father. It seems that everyone had a good time.

"That's good."

Jin decided that he would ask about the details when he returned to Horai Island.

He decided that he would ask about the details when he returned to Horai Island.

Half an hour later, there was a knock at the guest room door. Hope opens the door and answers it.

"There will be a debriefing on the results of the analysis of <>. Would you like to attend?

Fiona Fierce asked.

It seems that she had resumed her role as secretary as soon as she came back. She seemed to be a serious person.

Yes, thank you very much.

Elsa answered.

Jin, of course, is ready to listen, just as he told Manon during the day.

Please come this way," says Fiona Fiasse.

Fiona Fiasse led us to the auditorium.

Half of the seats in the auditorium were already occupied.

Jin-sama, Erza-sama, this way please.

Jin and the others were shown to their special seats in the front row.

"Please wait for about ten minutes.

Fiona Fierce said and left.

"I'm looking forward to it."

"Yes, it will be."

Jin and Erza waited impatiently for the time when the report was about to start.