The , with Jin and the others on board, is driving through a spacious area.

"Okay, Rubina, you can try your hand at piloting."

"Yes, thank you, Jin-sama!"

Rubina replies happily.

"Okay, let's switch."

Natalia and Rubina switched places.

"If you do this here, you can change the height of the seat. This way you can move it back and forth."

"About this high, I think."

The seat was adjusted to fit Rubina's body.

"Okay, let's go."

Rubina, in a fit of excitement, suddenly opened the throttle to full throttle.

"Whoa!

The Dolphin shuddered and then jumped out of the water.

"I'm sorry!"

This time, he closed the throttle completely. This causes a sudden deceleration, and everyone falls to the ground.

"I'm sorry!"

Rubina panicked. Jin patted her on the head,

"Calm down. Open the throttle slowly.

She advised him to open the throttle slowly.

"Yes, ......."

Seeing this, Jin realized that Rubina had never done this kind of maneuver before.

"Rubina, you are still too young, but I think you will be a great engineer if you get more and more experience.

So Jin told her exactly what he thought.

"Really?"

Rubina's face turned red and she looked down.

"Mae!　Before!"

"...... what?　Kyah!"

Before she knew it, the reefs surrounding Onogoro Island were closing in.

"It's dangerous."

Rubina stiffened. But Reiko quickly uses the force field generator to change the Dolphin's direction and course, thus avoiding a collision.

"Oh, thank you very much ......, Mr. Reiko."

Rubina, her face pale, thanked Reiko.

"No, don't worry about it."

Then Jin also called out to her.

"Rubina, try to steer a little more carefully.

"Yes, sir!"

Rubina, who had been expecting to be asked to take over the controls, now seriously concentrates on piloting the boat.

She seems to be experimenting in her own way by gradually turning the rudder, speeding up and slowing down. For the time being, Jin does not interfere, but lets her do what she wants.

Then she says,

"Okay, try some more drastic maneuvers.

And he says, "Okay, try a more drastic maneuver,

"Yes!

Rubina responded with a cheerful "Yes!

She made turns in a radius of 10 meters (=10R) and zigzagged. Full-speed sprinting.

As expected, she did not make a turn from full speed.

And then..,

"Thank you, Mr. Jin!　I understand!

and stopped the boat.

"Are you done?"

"Yes. I learned a lot. Thank you very much.

"Well. I hope you get something out of it.

* * *

Natalia takes over the controls once more. She is a few steps more stable than Rubina. And then..,

"Jin-sama, can you make the Dolphin into a racing version, just a little bit?

I asked.

"I can, but would you like to ...... experience it?"

"Yes!"

Natalia said, wanting to experience a more serious setting, one that would push the limits of what was possible, rather than the mild maneuverability of the present.

"Okay."

Jin adjusted the controls and the aft propulsion system. It took about a minute.

"That's good."

Natalia and Rubina were amazed at how fast he did it.

"Are you finished already?

"Yes, yes. The ...... necessary settings are stored in the auxiliary control core, so all you have to do is call it up."

"Huh. ......."

Rubina sounded dumbfounded.

"Well, the current settings are just about 80% of the limit. Go ahead and try."

"Yes, yes!

Natalia started the Dolphin with trepidation.

"No!"

Natalia had been so careful, but suddenly the hull shook. Then came the dash. The acceleration was similar to that of the first time Rubina had piloted the boat, but even greater.

"I never thought it would be this hard to fly!　Kyaaaah!

Natalia screamed. And then it stopped.

"...... is ...... Jin-sama, I understand perfectly. That's enough!

Are you done?

Yes. This setting is too severe to pilot without practice.

I see. Okay, Reiko, take care of it.

Yes, Father.

At this point, Jin asked for Reiko.

Reiko takes the pilot's seat in front of Natalia. She adjusted her seat and looked back at Jin.

"Please fasten your seat belt, sir."

"I know, I know."

Jin, Natalia, and Rubina fasten their seatbelts. Reiko confirmed that they were fastened,

"Okay, let's go."

and opens the throttle.

The Dolphin starts off with a smoothness that is in sharp contrast to Natalia's. "Let's go to the top speed first," she says.

"Let's go to the top speed first," she said again.

Reiko said again, and slowly opened the throttle to full throttle.

"Wow, wow!　That's amazing!"

The Dolphin is now speeding along at an estimated speed of over 150 kilometers per hour.

(This is 80% ......)

Natalia thought to herself that she had not yet reached 80% of Jin's speed.

The Dolphin, which was making a large arc, slowed down slightly and then made a sharp turn.

"Kyaaaah!"

The Dolphin is subjected to tremendous lateral G's, but because the driver is wearing a seatbelt, he is not thrown out, and the Dolphin maintains a stable posture as it completes the turn.

"I think it's about 20R. ......"

Natalia is amazed at the small turn from that high speed. So is Rubina.

Reiko swings the Dolphin from side to side.

"Wah, wah, wah..."

"Kya, kyah!"

The direction of motion changes rapidly. At the same time, the direction of lateral G-force is also switched. Rubina is on the verge of dizzying herself with the unfamiliar sensation.

Natalia, on the other hand, is holding on.

And Jin..,

"......<>"

He had cast a healing spell on himself to stop the intoxication.

After a long and enjoyable high-speed cruise, they returned to the pier just as the sun was beginning to set.