It was the year 3466 of the continental calendar, when Jin was 30 years old.

On the island of Horai, Erza, Hanna, Saki, and the others were racking their brains.

What they aim to jointly develop is <.

The ultimate goal is to create artificial organs using homunculus materials.

And now, as a preliminary step, they are trying to develop a bio-material that will not be rejected.

If this can be achieved, organs such as the stomach, intestines, and heart, as well as large blood vessels, can be sealed without bringing in tissue from elsewhere.

"After sealing the hole, I want the cells to gradually assimilate into the person's own cells."

"That's right, that would be ideal.

"Yes, that would be ideal." "But how do we make that happen?

Erza, Hannah, Saki and the others were sharing their opinions, making use of their respective areas of expertise.

"We could take the DNA information from the cells in contact with the transplanted cells."

Elsa presented her theory.

"Yes, that's how we can replace them little by little.

Hannah agreed.

"Then the question is whether the homunculus cells have such a function or not.

Saki said cautiously.

"Well, I think it's useless for us who have never used them to discuss that point. I'd like to ask Mr. 700672."

Hannah made a good point.

"Okay. I'll call him."

Erza nodded and used her manacam to contact Marikka in the first.

< is recognized as the master by the 700672, so I thought that I would be able to get her cooperation for sure if I could talk to her. I thought that I would be able to obtain her cooperation if I could use her as my intermediary.

The next day, Elsa came to the hotel and asked for help.

The next day, Erza, Hanna, Saki, and the others were in the consulting with 700672.

"Hmm, so that's how it is."

"How about it?　Would you be willing to help them?"

Marikka was also present and offered her assistance.

"Of course, I have no objection, since Marikka-sama asked me to do so.

Hence, the 700672 was very favorable.

"If we adjust the materials for homunculus, we may be able to apply them to such organs.

That was good news.

"......, but it is a technology that the have not been able to achieve."

"How so?　Why?"

Hannah looked at him curiously.

"Well... The technology that you are trying ...... to use for the time being is fine for blocking a part of an organ or a blood vessel, but for the organ itself, it did not fit well."

"What do you mean?"

Elsa asked.

"Well, you are a healer, aren't you? Then you would understand. Would you understand if I told you that ......<>?"

"It's ......."

Elsa had an idea.

"You mean, for example, that a transplanted heart doesn't start working?"

"That's right."

The three were disappointed to hear this.

The target technology had already been studied by the , and they were one step closer to achieving it.

What's more, we now know that the path is a dead end.

"......It's a shame."

Hannah is disappointed. No wonder. All her efforts have been half in vain.

"Well, this happens sometimes, doesn't it?"

Saki said in a voice that could not hide her disappointment.

"Even ......."

But Erza was different.

"Even if it's a dead end, I think the road has meaning."

"Erza?"

"Hannah, Saki, you may not be able to produce organs. But it is effective for heart disease and gastric perforation."

Erza, in her position as a <>, reassessed the significance of this research.

"Hmmm, I see!"

Hannah immediately understood what Erza meant.

"That's right. Not everything we've studied up to this point has been in vain."

Saki also regained her energy.

"......Hohoho, you guys are so positive."

Listening intently, 700672 seemed impressed.

"But the surgery is a lot of work, isn't it?"

"Oh, that's okay."

Now Hannah answered.

"What?"

"If it's just a surgery to plug a small hole, I think I can manage with a <>, a <>, and a <>. ......

"What?"

"...... Hannah-chan is saying that we can transfer the necessary <> to the affected area and then use the <> to plug the hole. With the <>, the surgery can be done almost painlessly."

Elsa explained.

"......mmm ...... I see."

The 700672 seemed impressed.

"Excellent!　That procedure had never occurred to my . It seems that your efforts were not in vain.

He praised them. But..,

"However, this , couldn't it send matter into a place where there are solids or liquids?

The 700672 pointed out what could be called a hole in the method.

"Oh, that's fine."

Hanna replies again.

"First, a small sphere of vacuum is formed in the affected area using a <. Then we send the MagiBio material into it and slowly dissipate the vacuum.

The MagiBio material is only for homunculus, and is strong enough to withstand a vacuum for a short time.

"Hmmm, I see. That should work well, Hannah-sama."

"It will, won't it?"

The problem with this method is that you are the only one who can use the Peeper, the Force Rod, and the Transporter at the same time.

For the time being, we have to leave it to the old man and Lise.

Elsa looks disappointed. However, it is inevitable because it requires ultra-precise operation.

"So, please give me some information on the MagiBio material.

Saki concluded. 700672 nodded.

700672 nodded. In that case, I will tell you what I know.

Thus began the research by the unique combination of Erza, Hanna, Saki, and the 700672.

Thanks to their efforts, results were achieved in half a month.

The homunculus material could be adjusted for human use.

"Now all we need are results."

"Yes, that's right."

"Yes, I know."

But we couldn't just experiment on humans.

We needed just a little more time before this technique was truly perfected.

And while the completed technique cured Elise of her heart disease, it was inevitable that Elsa and the others did not know about it.