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Maneuverability, acceleration and deceleration, and stability.

"Well, except for stability, it's more than adequate."

With normal rudder and outer wheel control, the car is quite maneuverable.

However, the stability is not so good, or rather, the rolling, or rolling, was larger than expected.

This was a side effect of the narrow width of the boat.

If the force to restore the tilted hull is too large, the hull returns too much and tilts to the opposite side. And then, the force to put the hull back again works. The process repeats itself.

"I see!　We can add something to the ship that will act as a damper."

Reinhardt, who had been pondering over the idea, came up with a solution. As one would expect of a ship, Reinhardt is very flexible in his thinking.

An overhang called a bilge or bilge keel was to be placed diagonally down below the draft on both sides of the ship. This increases the resistance when rolling in the water and reduces swaying.

"Let's try this as soon as we get to the other side."

The outer ring was excellent for acceleration and deceleration, especially for deceleration.

And then...

"Hmmm, this is about the same without Lorelei's boost. ......"

With pure outer-wheel drive, the maximum speed was about 20 km/h, half of the previous result.

This shows how Lorelei has an outstanding swimming ability.

After conducting various tests and eating refreshments on the boat, we arrived at Koju a little earlier than the boat with our luggage. Considering the baggage pickup, this was convenient.

We enjoyed the sightseeing on the lake, and Bertsche and Jin and the others had no complaints.

"Your accommodations are this way, sir.

Claude, Reinhardt's butler, who had brought the luggage safely, leads the group to their lodgings.

It was a luxury hotel near the center of Koju. Right next door is a guest house.

"The exposition will be held in a newly built multi-purpose facility near the port."

Khoju is close to the capital, Leusert, and is expected to grow as the front door to Lake Tosmo, which is why these facilities were built, according to the hotel.

Jin recalled the buildings in Makuhari and Ariake. He had never been there.

Jin and Reinhardt went to the multipurpose facility with the exhibits and placed them in the designated areas.

When they were done, it was already nighttime.

After returning to the hotel, they joined Bertsche and Saki for a sumptuous dinner.

"The show finally starts tomorrow!

Afterwards, Jin muttered to himself with anticipation while drinking after-dinner tea in his room.

Jin's room has a living room and two bedrooms, one of which is reserved for his assistant. Both bedrooms are for two persons. This is convenient.

I will bring Elsa here early tomorrow morning.

The night in Koju passed quietly.

* * * * * * * * * * * *

The time difference between Koju and Kaina is about three and a half hours. 5:00 a.m. in Khoju is 8:30 a.m. in Kayna.

Jin flew to Kayna village with Reiko through the warp gate in the carriage left at the hotel.

"Good morning, Brother Jin.

"Good morning, Jin-sama."

Erza and Meine were already prepared and waiting for them, as they had been told.

Erza was dressed in the same manner she had made since arriving in the village of Kaina. Erza was wearing the outfit she had worn when she went to Alban, the capital of the Kingdom of Klein. Meane was dressed in her usual maid's uniform.

"I'll give her this, too.

She gave him the same guard ring as Elsa's. "And I'll give this to Meine," she said.

"And for Elsa, this and this.

It is a dark brown wig. Since magic dyes cannot change the length of hair, she used a wig this time.

A semi-short hair becomes semi-long, which gives a very different impression.

And the protective glasses. The face also changes considerably. However, since Saki is probably the only one who wears glasses, it might be more noticeable.

So Jin decided to put on the protective glasses as well.

"Okay, let's go."

"Okay, let's go."

"......"

The two are a little nervous about going back to their home country. Jin patted them on the shoulder to reassure them and they went through the warp gate in the basement of the workshop. Reiko and Edgar followed.

The three of them and two others went out through the intermediate base to Koju in the Shoro Kingdom.

"As I said before, this is Koju. This is the coach yard of the hotel next to the guest house there.

"......Yes, I've been here once."

Perhaps he had been there on his last trip. However, Jin refrained from opening his mouth when he saw Erza and Meane who had fallen silent.

A single tear fell from Erza and Meine's eyes.

Erza wiped them away with the back of her hand,

"Jin, my brother, thank you," she said, her voice filled with emotion.

She thanked Jin with a voice filled with emotion.

"Thank you very much, ...... Jin-sama."

Meine, still in tears, thanked him.

"No, it's not over yet."

Saying this, Jin led them to his room in the hotel for the time being.

One of the two bedrooms was reserved for Erza and Meane.

"Well, today is the day of the technology expo. Erza and Meine, please stay at the hotel as we discussed. Elsa, please be patient, we're almost there."

"...... yes."

Okay.

At that moment there was a knock at the door. Reiko left and opened the door to find Reinhardt standing there.

"Jin, you brought him here as planned."

Reinhardt showed one of his eyes,

"In two hours it will be time to go to the expo hall. Let's go have breakfast."

"Okay."

Erza and Meine had already eaten in the village of Kaina, so only Jin left the room.

Nothing seems to have changed in the schedule.

So, the first thing to do today is the opening ceremony and then the introduction of the participants, right?

That's correct. Since even the assistants are not required to attend, Erza will stay here for the time being.

So the two of them ate their breakfast while checking the schedule.

"Speaking of which, where is Bertsche?"

Jin wondered, since he had not seen Bertsche, who was always with Reinhardt these days.

"Oh, Belle has finished her meal first and is going to greet the nobles she knows who are staying at the same hotel.

"Shouldn't Reinhardt go?"

Reinhardt replied with a wry smile.

"Oh, come on, you know what my role is.　You know what role I have in this? I'm the hostess for the gin.

Jin remembers now that he was right. He had forgotten about it since he had been going back and forth to Kaina Village and Horai Island as he pleased.

After finishing the meal, Jin and Reinhardt went back to their rooms and finally checked if they had forgotten anything, and after that, all they had to do was to wait for the pickup.

Bored, Reinhardt came to Jin's room and had a casual conversation with him.

"By the way, where is Saki?"

Erza asked when she couldn't see Saki's face.

"Oh, the alchemists are supposed to meet an hour ago. They ate and went out ahead of us."

"Yeah."

Reinhard stared at Erza's face. Erza noticed his gaze and tilted her head. >>he asked.

"No, it's just that it's new to see Erza dressed like that. You wouldn't recognize her if she didn't talk."

Now Elsa looks like this, with dark brown semi-long hair and protective glasses. She looks quite different.

"Well, it would be better if Reinhardt wears protective goggles too, so that Erza will be less noticeable.

Jin took a spare pair of protective goggles out of his baggage and handed them to Reinhardt.

"Yes, that's right. Even though I'm going to do most of the processing with magic, it's not a waste to keep my eyes protected."

Reinhardt smiles as he puts on the protective glasses. Three of them, or four if you include Saki, are wearing glasses. That must have cut the attention to Erza in half.

In the meantime, it seemed to be time to go, and a man who looked like a member of the exposition committee came to call us.

"All right, let's go then," he said.

"Okay, let's go." "Okay.

"Have a good trip."

The two men and two bodies get up and leave the room. Erza and Meine see them off.

Reinhardt stops by his room, takes his baggage, and comes out with Black Knight Noir.

The technical exposition is about to begin.