Konoha Hospital.

Looking at Hei, who was doing rehabilitation training in the backyard, Ryuuji opened his mouth and asked, "This right arm is fine, is there a delay in command?" ”

"No, the transplant was a success." Black waved his right arm back.

"That's good."

Ryuuji bowed slightly, "This right arm is the same style as Yin, and it has strong strength and endurance, which can make you a lot stronger." ”

Black's ninjutsu is Thunder Escape, and the strongest move is Ninjutsu - Thunder Attribute Chakra Armor.

That is, the thunder covers the whole body, and at the same time plays a role in the activation of body cells, thereby increasing body functions and strengthening the speed of explosion.

But.

If you don't have enough strength, no matter how fast you are, you won't be able to hurt some guys.

The balloon and the iron ball hit the wall at the same high velocity, and the balloon will be bounced or burst by not being able to withstand the air pressure of the high-speed flight, but the iron ball can break the wall.

With this arm, when Kuro uses ninjutsu again, he won't be shocked by an enemy like Tsunade.

The strength can be described as a leap forward.

"Thank you, host."

Hei replied indifferently, even if his strength has been greatly improved, his voice is as calm as ever, and he can't hear the slightest sadness or joy.

"Let's take a good rest, and when my body is completely healed, I will continue to study the use of ninjutsu."

"Yes."

……

After saying goodbye to the black, Ryuuji prepares to go back.

In the past few days, he has been doing this arm for Black, and a lot of research has stopped.

He now needs to go back and continue his research.

Although the scopes and 3D printers are not there, there is still a lot to study.

Walking through the inpatient area, Ryuuji is stopped by Tsunade in the outpatient area.

At this time, she hadn't put on the green windbreaker with the word "gamble" printed on the back, but she was just wearing the green vest of Shangnin, but her figure, appearance and even temperament were almost the same as her future image.

He didn't keep staring at each other, which was too rude, but he just looked at each other roughly and asked, "Is there something wrong?" ”

Hearing this unfamiliar inquiry, Tsunade frowned, but spun out his mind.

"I just came out of the black ward." Tsunade asked calmly, "How did you get him a prosthetic leg?" ”

After speaking, he seemed to be worried that Ryuuji would misunderstand, and immediately added: "How do I mean to connect the nerves in the brain?" ”

It is not difficult to connect the severed limb, but the difficult thing is that after the severed limb is connected, it can still move normally as before the severed limb...... The human body is transmitted by the central nervous system to the brain to command actions, and every part of the human body has a direct connection with the central nervous system.

If a part of the body is separated from the body, the connection between that part of the body and the central nervous system will also be severed.

Even if a prosthetic limb is installed or a severed arm is attached, there is no way to restore contact with the central nervous system, and it cannot move like a normal limb, and it is just an immovable ornament.

In this era, even the almighty chakra has not been able to solve this problem (referring to normal people).

"Are we acquainted?"

Ryuuji wanted to laugh a little.

He knew better than anyone what neural connection technology meant in a world of constant war, and he was amused by Tsunade's behavior.

It's not a parent, I don't pay anything, I just run to ask about this kind of technology that is ahead of the times.

Why do you think someone else will give it to you?

Hearing these unceremonious words, Tsunade raised his eyebrows, and his temper was about to flare up.

But thinking of the identity of the other party, I forcibly suppressed the impulse.

She breathed a deep sigh of relief and showed a familiar smile, "Look at what you said, Sha Yin and Konoha are allies, aren't the little ghosts you sent to study also learning advanced medical ninjutsu and systems from us?" ”

Ryuuji didn't speak, just watched quietly.

Tsunade was still smiling, smiling, smiling, and then his face was crotched.

"Bang!"

Tsunade slapped the wall of the hallway, creating a deep crack, and looked at Ryuuji through gritted teeth, "How can you tell me?" ”

"You're going to make a deal with me?"

Ryuuji tilted his head and looked at her playfully.

"That's right."

Tsunade took a deep breath and tried to stabilize his previous outburst.

After a while, she calmed down and looked at Ryuuji with a serious expression, "Let's say it first, I can't do a lot of things in Konoha, so I don't ask to mention it too much." ”

"Then let the people who can call the shots talk!"

After saying that, he didn't care about Tsunade's reaction, and was about to leave her.

Tsunade reached out and blocked the way.

She lowered her head, bit her lower lip, her hands crackled, and her eyes covered by bangs were full of hesitation.

Clearly, she was struggling with something.

"What do you mean?"

Hearing the questioning, Tsunade's face struggled even more, but he immediately relaxed.

"I'll trade this for you." Tsunade said as he took off an emerald crystal necklace from his neck and handed it to Ryuuji, "This is the necklace that the first Hokage once wore, and it is worth three mines, so it's enough to buy your technology!" ”

"Not enough."

Ryuuji pondered for a moment and said.

This necklace crystal is a chakra crystal, which contains the chakra seal sealed by the original Hokage, which has a suppressive effect on the tailed beast, whether it is used to wear it for future people, or to study it yourself, to enhance the potential of the wooden ninja, it is comparable to the value of neural connection technology.

In addition, because it is a necklace inherited from the original Hokage, its own collection value is also unique, and it is very cost-effective even if it is used to sell it for money.

In particular, Sha Yin is now going to build a machine city, and there is a lack of funds in his eyes.

If this necklace is in place, the construction progress of the city can be accelerated by at least two to three percent.

But.

The price is sky-high, and the money is paid back on the ground.

Tsunade was the one who was hungry for a deal, and she didn't know that the necklace was of such value to Ryuuji.

Therefore, it is also possible to continue to haggle and ask for some benefits.

In the end, the two bargained.

Tsunade uses the necklace of the original Hokage and all the materials she has studied for the Yin Seal as a bargaining chip in exchange for Ryuuji's neural connection technology.

Tsunade reluctantly handed the necklace in his hand to Ryuuji.

"You take the necklace first, and I'll go back and sort out the research materials of the Yin Seal and then hand them over to you."

"Trust me so much?"

Ryuuji took the necklace and teased while checking the authenticity: "I'm a ninja in the sand, after what happened a few days ago, you should all want to kill me!" ”

"You have so many people in Konoha that you are in Shayin, and I'm still afraid that you will run away?"

Tsunade snorted, a look of disdain.

In this period when most of the people are rushing to the front line, Konoha may not be able to stop Ryuuji from escaping, but the hundred people of the study abroad mission ...... Hum.

This point, Long Er knew this, and it was naturally impossible to move the situation of running away with things.

"Okay, I'll go back and sort out the neural link technology and bring it to you tomorrow morning."

"So be it!"