"The last time I saw you, you were only as big as my breasts, but you've grown. And you're beautiful."

The man who says this to Erza is a great man with platinum blonde hair and light blue eyes, the same color as Erza's. He turns to Reinhardt this time. He now turns to Reinhardt.

"Reinhard, thank you for babysitting my sister."

Reinhardt does not seem bothered by the somewhat arrogant tone and speaks to him in a friendly manner.

"Long time no see, Fritz. You're a major now?

"Yes, I was promoted this year. You seem to be doing quite well. I hear rumors of a Black Knight.

I'm honored to hear that.

The two talk without honorifics, as if they've known each other since childhood.

"Yes. We were here today on the Egelea Kingdom side for border patrol. I saw a familiar carriage parked right next to this hotel. I thought it might be a good idea, and I was right."

The man called Fritz turned to Elsa once more,

"I'd like to have a long talk with you, but I'm still on duty. I'll be back tonight."

With that, he bowed respectfully and strode out of the cafeteria. From the beginning to the end, Jin did not seem to pay attention to him.

When Fritz left, Reinhardt turned to Jin, scratching his head,

"Surprised, aren't you?　That is Elsa's brother, the second son of the Randall family, Fritz Randall von Grosz. He is the commander of the expatriate garrison.

He is a company commander in the Expatriate Army. He is no longer with us.

"My brother Fritz is a soldier. He's a bit simple."

Elsa explained about her brother's personality.

"I see...a brainy guy..."

Jin inadvertently said what he thought.

"Brain?

"What's that, Jin?

As expected, Erza and Reinhardt overheard him. Jin had no choice but to explain.

"Well, brawn is a figurative expression that even the brain is made of muscles, and it refers to a person who is better at moving his body than thinking. ......

He explained with some euphemism. Erza's own brother cannot be described as <, <, or <> by mistake.

But he still took it pretty well,

"Muscle to the brain...... brother Fritz...... pukuku......."

Unusually, Erza is about to burst out laughing. It is quite fresh to see her trying to hold back her laughter.

"Ha-ha-ha, Jin has a funny way of expressing himself!　Look at that Elsa's face. I've seen something rare. ...... Well then, I'm off to the formalities. What about you, Elsa?"

Erza, still shaking, finally looked up at Reinhardt's question,

"Meane said she would show me around the city today.

She replies.

"I see, Meine is from around here. I see. Take care. Jin, what about you?

I'm just going to look around town.

I'll see you at night. I'll see you in the evening. ...... Claude, let's go.

"Yes."

Finally, Reinhardt, his face now serious and in diplomat mode, left the dining room with his butler, Claude.

"Well then, Jin-kun, see you later."

Erza also leaves. The remaining Jin turned to Reiko, who was hiding in stealth,

"Reiko, let's go, then."

and left the cafeteria.

* * * *

Jin had returned to Horai Island with Reiko.

He had a lot of things he wanted to do. By the way, he left Anne in the hotel room. If anyone asks her, she is instructed to tell them that she is out in the city.

And the first thing she wanted to do was

"Reiko, happy birthday, even if it's a day late."

"What?　Father?

April 3rd, two days after Jin was summoned to this world, was the day Reiko was reborn. Today is the 4th. The reason for the delay, he couldn't make it in time to avoid Reiko's detection.

"Here are new clothes. You can wear this one this time."

The clothes I had been wearing had been checked after the battle with Gigarth, and I found a few worn-out parts, so I made new ones.

The fabric is the same, but this time the color is jet black. Combined with Reiko's hair and eyes, it looks mysterious. In fact, this black dye has the best anti-magic performance.

"Thank you, father."

Reiko quickly changes her clothes on the spot. She folds her old clothes carefully and puts them in the far corner of the equipment room for Reiko.

"Yes, it looks good on you. You look a little more mature.

Reiko smiled happily when Jin said this.

The next step was to check the information obtained from Anne.

Some of the information was damaged or missing, but if it had been completed by Lao Tzu, we would have a lot of information.

"Lao Tzu, how are you doing?"

Jin asks how well the information obtained from Anne has been restored.

"Yes. The recovery rate of the information is 85%. The remaining 15% were so damaged that I am sorry to say we could not recover them.

Lao Tzu looks apologetic and Jin says, "Oh, yes,

"Oh, that's no problem. So, did you find anything new in the information you were able to recover?　Let me know if there is.

He urged him to go on. Lao Tzu responded immediately.

The first one is the knowledge of medicine, the second one is the information of the golem suit, and the third one is the origin of the magic war. The third one is the origin of the magic war. The rest is still in the process of completion and repair.

"That sounds like a lot of interesting information. But you have information on the origin of the war, but not on the "Aether Stampede"?

"Yes. It seems that Anne was abandoned before the Aether Stampede occurred.

I see. I see. Then it can't be helped. Then, the chemical?　Give me that information.

About 98% of Jin's body has been replaced by Magiatom, or atoms made of magic particles. Therefore, if an "ether stampede" were to occur, Jin would disappear in an instant. That is why he wanted to know the information about the "ether stampede.

At the same time, cells made of magical atoms are more stable than normal cells. Therefore, the effect of training does not appear, which is a drawback, but on the other hand, they are not affected by pathogens or other factors. The only exception to this is mental anomalies.

Therefore, Jin's body can be injured but not get sick. What about growth and senility, that remains to be seen.

That being said, Jin was interested in medicines. There were few medicines in the knowledge he inherited from the previous Magecraft Meister, Adriana Barbora Zetsi.

He barely knew about ointments to protect the skin from irritating materials and ointments for burns.

"Yes. There was information about a medicine that uses magic to improve the healing power in the body.

Lao Tzu's words made Jin jump.

"A potion!

It is famous in some games such as "Slay the Dragon" and "The Last Illusion". Jin was very interested in it because synthesizing potions is not a magical engineering (magecraft) but an alchemy.

Yes, it is what is called a potion. And I also found information on so-called , which restores magical power.

In this world, ether refers to , which is a magical element ubiquitous in the world. Confusing, Jin thought.

"Well, it doesn't matter. Do you know how it is made?

"Yes. The most popular way is to purify the blood of high-ranking demons. It seems to be similar to what is called .

Hearing this, Jin is tempted to try making it.

"Ah, but it's not the blood of a high-ranking demon, is it?

Lao Tzu replied,

"Yes, it is.

"Yes, I have it.

"What?"

"The sea dragon we defeated the other day, its blood has been secured and frozen.

"Well, that's great!"

Jin is delighted this time. He immediately went to the freezer to see the frozen blood.

"Wow!

It was about 20 drums of blood from a huge sea dragon. That's about 4 kiloliters, or 4 cubic meters. That is a tremendous amount.

Jin brought out a small portion of the blood for experiments. Lao Tzu was very clever in this respect.

"Let's try to purify it first.

Jin explores his uncertain knowledge and decides to try centrifugation. I can build a machine, but first let's try something simple,

"Reiko, please.

Reiko, please." He decides to leave it to Reiko.

"Yes, Father."

Reiko swings the blood around in the adamantite container, which is inert to chemical reactions. The container was so durable that it was swung at nearly the speed of sound, but the effect was unexpected.

She was able to separate the blood into three components.

Serum is essentially blood minus the blood cells and platelets, but because it was further centrifuged at an ultra-high speed that no one had ever thought of before, a liquid that could be called <> was found.

"Well, is this clearest part the serum?　The rest will be analyzed later, so please keep it frozen.

Jin brought the crystal container containing the true serum in front of him and looked into it. It was about 300 milliliters.

"Lao Tzu, what are you going to do with this?"

"Yes. It should be rich in mana. Please check it out.

Jin checks the flow of mana by . It is indeed true. It is indeed true. In fact, you could almost say that it is mostly mana.

All that remains is to give it directionality. <, it becomes a potion, and if you give it , it becomes ether.

Having the knowledge of Jin, Lao Tzu's explanation was very easy to understand. However, it was made from the blood of a sea dragon, which was ten times more potent than the one in Ann's time.

"I see, it's the same idea as imprinting magic into magi crystals.

Jin understands, and decides to implant <> magic into the Magi Crystal, but it is not available to him. Not even for Reiko at the moment.

"Well, I guess I'll have to wait until Reiko learns it somewhere..."

Jin took 100ml of the liquid as an experiment and put his own healing magic, <> into it.

The liquid glowed for a moment and then returned to normal.

"Well, I'm sure it works, but I don't have anyone to try it on.

Jin is not injured, and the golems do not need the cure. So Jin has no choice but to put the potion he made into a bottle and save it until he has a chance to use it.

He uses forming magic on the crystal to make a bottle, and puts a lid on it with a piece of wood that looks like a cork. I put it in my pocket.

Now, the second golem suit was also interesting.

"A power suit!

Jin is unusually excited. But there seems to be no detailed data.

"Well, I guess I'll just have to make it myself.

In this way, another extraordinary piece of equipment was born.