Tsunade's eyes were a little dark for a while, and Yayoi was keenly aware of it.

"Come and sit at my house, Tsunade-sensei, this is my former home, where my parents used to live."

"Light sound"

Tsunade thought of his old classmates, and the corners of his mouth hooked up a smile, and the sister and brother followed Yayoi into the house, and the house was cleaned by Yayoi clean.

"Tsunade-sensei, do you have anything on your mind?"

The three of them talked a lot, Yayoi talked about his childhood and Flame sprinkled dog food, and stimulated Tsunade and Rope Tree.

Tsunade told some embarrassing things about rope trees when he was a child, and the rope tree with an embarrassed and ashamed face had nothing to say, and finally ran out directly in anger.

There was no one around, and Yayoi just wanted to test the reason for Tsunade's emotions.

"Yayoi, am I not fit to be a ninja, I can't even protect my companions."

At the mention of sadness, Tsunade also hung his head in frustration.

"Has anyone died again this time, who is it?"

"Broken, Kato, my friend, he died in front of me, but my medical ninjutsu failed to save him, and even the immortal arts failed to save him."

"It's not your fault, Tsunade-sensei."

Yayoi can only comfort.

This kind of thing is unexpected, Yayoi originally wanted to ask Kato to break the spirit technique, but he didn't expect him to die suddenly.

It was too much of a surprise, but that's what war is.

Take what you have when you are unprepared, unless you have enough strength.

Yayoi was lucky to have a burst of blood.

This means that he will always have a force of his own that can fight for his life to protect the distant impossible.

It's like borrowing power from God, and it's more fortunate than the revenge of the Uchiha after writing the wheel eye.

"But I'm still not reconciled."

Even though he knew that the break had been injured by the detonator at that time, all the internal organs in his body were oozing blood, and his heart was destroyed, Tsunade still did not give up the treatment.

"If I research a perfect immortal medical ninjutsu, doesn't that mean I can save such a person?"

Suddenly, Tsunade seems to have found a kind of hope, or rather obsession.

"Immortal medical ninjutsu, how far has the teacher studied?"

Yayoi thought for a moment and asked.

Senjutsu medical ninjutsu Yayoi had heard of it, and it was the direction of the other party's research when he was previously assigned to Tsunade's natural energy.

At that time, it was divided into two different topics by Tsunade.

I heard that it is a study that uses the Yin Seal of its own learning to pull natural energy in order to gather natural energy and enter the immortal mode at any time.

There is also a regenerative agent that uses natural energy as an introduction to study the characteristics of natural energy to activate cells.

I have to say that Tsunade is indeed a genius.

Her body flowed with blood from the Thousand Hands Pillar, and she had an adaptability to natural energy far beyond that of others.

In the first stage of Topic 1, she boldly assumed that she would try the method and seal the natural energy with the sealing technique, revealing a trace of gaps, allowing it to wash away her body little by little.

Being washed by natural energy for a long time can effectively improve one's adaptability to natural energy.

Of course, it is under the care of the slug immortals, otherwise if there is an accident, it will be a mortal dilemma.

And Tsunade has also set up multiple layers of seals to ensure his own safety.

In this way, Tsunade intends to first exercise his adaptability to natural energy, and then he can turn on the immortal mode at will after gathering natural energy to seal it in Yin.

This method is only in its infancy, and it will take several years for the Tsunade to take effect.

There is also a Yin Seal that allows her to directly store the Immortal Chakra, and she can even turn on the Immortal Mode all the time when necessary.

However, how to make the Yin Seal store higher quality Immortal Chakra is also a study.

The second topic, which is also Tsunade's main research, is mainly to highlight an adaptation period, so her time is mainly spent on researching regenerative potions.

Regeneration potions, based on her experience in blending antidotes, are also extremely difficult jobs.

Natural energy is very easy to get out of control, let alone combine with other medicinal ingredients to become a regenerative potion.

"It's so easy to get out of control, and although I've developed this potion, it's limited to people like us.

Unless it has the vitality of life that is far beyond ordinary people like me, and a certain natural energy adaptability.

Otherwise, this potion is not used well, it is even more violent than natural energy, and no matter how much you weaken the meter, it will be useless."

Thinking of the scene of the surging heartbeat of the potion, and the petrification of the powerful power of the regeneration potion, Tsunade couldn't help but constrict.

Even if it was used somewhere, the regenerative potion would continue to react until all the blood that came into contact with him bound to it, no matter how small the measurement.

And the measurement is too small to save a person, so this forms an endless loop.

"Time is too short, the war has taken away our time."

Yayoi couldn't help but sigh too.

Tsunade's two topics are of great research value to him.

The study of the immortal mode can even be directly inherited by him, his body is even more perfect than Tsunade, and he doesn't even need the sealing technique to directly draw natural energy to infuse the body and slowly refine it.

Moreover, the Yin Seal Storage Chakra can beautify the skin, and the storage of the Immortal Chakra may be able to nourish the body's yang and enhance the ability of natural energy adaptability.

Even for him, it has a very good meaning, just like a late-growth skill.

So Yayoi has always been very supportive of Tsunade's research.

Tsunade shook her head to indicate that she was not going to discuss the topic, although she hated war, it did temper their will, she was far less vulnerable.

"You should find a way to enter the immortal mode now, or you won't be able to outrun me directly."

Tsunade naturally knew about Yayoi's killing of the three generations of Kazekage, and this matter has now spread throughout the ninja world.

It is rumored throughout the ninja world that Shuo Mao's White Fang squad has the strength of two ninjas with the name of Shadow, and according to the unknown gossip of Sha Yin, Sand Yin is searching for the Tailed Beast.

For a while, the news of killing the Tailed Beast and besieging the Wind Shadow spread throughout the ninja world.

It can be said that in the entire ninja world, Yayoi's reputation has soared, and even White Fang can't compare to him.

On the cusp of the storm, the fame is even on par with the Hokage.

After all, the strong man who can kill the strongest Kazekage is definitely not under the Hokage.

"Fluke."

Yayoi smiled, not caring at all about these things.

This kind of thing stimulates his human show-off at most.

"As for the immortal mode, my immortal mode is not perfect, and it still needs time to prepare, which is far less convenient than the immortal art studied by Tsunade-sensei."

Seeing Yayoi admit it directly, Tsunade couldn't help but sigh.

The little ghost in his eyes has completely grown up and surpassed himself.

"There are so many uses for natural energy, Tsunade-sensei continue to study, we all need this power."

Yayoi took a scroll out of his pocket and handed it to Tsunade.

"What is this?"

"Some of my recent understanding of natural energy may overlap with Tsunade-sensei's, but it is still useful.

There are more liquefied natural energies that have been stabilized with my blood, and as for the chakra fixation, Tsunade-sensei himself has it."

"Of course, little ghost, I discovered the idea of chakra fixation."

Tsunade unceremoniously took the scroll directly.

Chakra traction, fixing natural energy was exactly what Tsunade was inspired to study with Yayoi, and Tsunade also contributed a lot to this idea.

"The natural energy stabilized by my blood is more stable for Tsunade-sensei's body forging method, but please don't give it to anyone else, Tsunade-sensei."

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Chapter 119: Research on the Immortal Pattern, Regeneration Elixir Free Reading.