The Magic Mirror Ice Crystal Stage Three, which was developed by Sakura Haruno some time ago, is the same as Naruto's now banned Spiral Pill Shuriken, which is an extremely powerful but also a great ninjutsu.

The contradiction is that this dangerous ninjutsu requires more practice to become proficient, and only after proficiency can it reduce backlash, but the practice itself will cause backlash and damage itself, resulting in the proficiency of ninjutsu not being improved and making slow progress.

This creates an endless loop.

Therefore, Naruto's move was simply forbidden to practice, unless it was an emergency, otherwise he could not use it, and only after his physical endurance and chakra's control ability became stronger, Naruto could really turn this move into his usual move.

Sakura, on the other hand, is also strongly recommended by Tsunade to take a few months off if you use it once.

Therefore, even with her control, she can only grind slowly and little by little.

Little by little, improve your control over this technique and reduce the backlash.

The Magic Mirror Ice Crystals are not progressing fast and stay at the status quo. On the Yin Seal side, there has been some progress and results in the development of Phase 2.

Sakura's current speed of accumulating chakras for the Yin Seal is too slow - after all, she is not a person with a high amount of chakra, and even if there are chakras left every day, it will not be much, and it will take a long time to accumulate them to see results.

Fighting with Junmaru and Kakuto, her chakra amount is very tight.

The only time the chakra fought to the end was the battle with the Red Sand Scorpion. It's just that this time she had been saving up chakras for months!

In this way, most of the blue tube was emptied at once.

The slow chakra accumulation speed seriously restricts Sakura's strength. Every time she fights someone else, she will be very weak - the amount of chakra in reserve is too small, which is very inconsistent with her "quasi-shadow" and "shadow" level titles.

What Sakura Haruno was particularly afraid of was that the battles would happen one after another.

The second phase of the development of the Yin Seal is designed to solve this problem.

However, to develop this, she needed uninterrupted time and laboratory.

The stack of task lists that Tsunade stuffed into her provided exactly that.

……

……

Near the borders of the Fire Nation.

This area, before the battle between Sakura and Kakudo, used to be the area where Orochimaru was active.

In some of the three areas on the border and the surrounding small country and small ninja villages, no one knows how many bad things Orochimaru has done.

The only thing that is clear is that this man has carved out many hidden bases underneath here.

As for the number, I'm afraid he can't remember it clearly. After all, creating this kind of base, which can be completed by only using chakra and ninjutsu, is simply easy for Orochimaru. If you don't include the labor costs of the shadow-level powerhouses, the most valuable thing in these bases is the experimental equipment in them.

However, Konoha can't look at these things, and when she first searched for the Orochimaru base, Sakura Haruno also captured them as a mission, and they were discarded by Tsunade as rags.

The second search, the time they met the corner, they didn't care about these things anymore.

After the base buried deep in the ground lost its value, Orochimaru and Konoha didn't take it to heart, and the place was completely forgotten, and I am afraid that unless there was an earthquake, there would never be a day of resight.

But......

A nondescript underground base pioneered by Orochimaru.

The base, which was supposed to be in eternal darkness, suddenly appeared with a glimmer of light.

It was a small, round fireball, held in the air, blooming with light, illuminating the halls of the underground base.

The fireball floated on the palm of the visitor, and the orange-yellow light reflected her face.

It is the Sakura of Haruno.

She found the location of the candles on the wall, lit them, and the underground hall lit up.

"Sure enough, no one has ever been here. Sakura looked around, and the place still kept the traces left by the 14th team after the search that day, and there was no new change in the footsteps on the ground, and it was obvious that this place had been completely abandoned.

"Very well, this is my temporary base. ”

The girl snapped her fingers.

A large stream of water appeared out of thin air from her side, flowing through the entire base, and Sakura manipulated the place to completely cleanse it. Then, Sakura's gesture changed, and the ice escaped chakra gushed out, turning the clear water into ice, enveloping the entire base in an airtight manner.

By the way, the damage in the base was repaired with the ice escape.

This is to guard against the weirdo I saw last time. His earth escape is really too impressive for Haruno Sakura, and Bing Dun should be able to prevent him from shuttling through this base by the way.

The next step is to create vents and use the wind to dissipate the depression underground.

This base is not big, and it didn't take long for Haruno Sakura to repair this underground base after this operation.

Then, Sakura Haruno expertly unfolded the scroll and took the experimental equipment and raw materials out of the sealing technique.

In the second stage of the Yin Seal, she originally planned to use clones as a source of energy, but the current conditions are definitely not enough for her to research the cloning technology, and she will have to go to the main base of the Snow Country next year to complete it.

But it doesn't matter, she has a rudimentary alternative for the time being: cloning her own heart to provide chakra.

A few months ago, Sakura Haruno had already mastered the technique of cloning organs in the land of snow.

Now Sakura is familiar with the preliminary work of cloning.

She plucked out a strand of hair and placed it under the microscope, her hand glowing with the pale blue fluorescence of medical ninjutsu.

The chakra with the power of yang stimulates the cells, and the keratinized cells at the root of the hair slowly change under the action of this magical force: the elongated, melanin-containing keratocytes gradually shorten, the shape becomes rounded, and the melanin gradually disappears, and some changes that cannot be seen under the microscope occur firmly and irreversibly under the action of medical ninjutsu.

About a few minutes passed.

Sakura Haruno raised her head and exhaled a long breath: "It's done!"

In the lens, at the roots of the long pink hair, the keratinocytes have been completely transformed into round, yellow-orange-orange embryonic stem cells under the catalysis of medical ninjutsu that contains changes in the nature of yang.

This is the process of "dedifferentiation" of highly differentiated cells.

Her approach was essentially the same as what Tsunade and others did to Xiyan's hair in the Konoha Medical Room at that time.

However, after receiving Orochimaru's information and the otherworldly knowledge in her head, this technique was perfected, and the heart cloned by Sakura took two weeks to cultivate, and the quality of the meticulous work was not much higher than that of Tsunade's improvised heart.

After Xiyan changed it, he quickly adapted to the new heart, and after training in the future, it is estimated that it will not be worse than the original goods.

No, it seems to be even stronger than the original one......

Suddenly thinking of Xiyan's matter, Sakura also smiled dumbly: "Xiyan's side, everything is developing in a good direction, a little mistake, don't pursue it!"

She spread out the embryonic stem cells she had made, put them into twenty petri dishes, and nourished them with Yang Dun Chakra to slowly promote the development and division of the stem cells.

Of course, Sakura can also use a large number of Yang Escape Nature Change Chakra to directly act on this cluster of embryonic cells, causing it to grow rapidly, expand to the size of a fist at a speed visible to the naked eye, and then split into a heart, but it is pointless to do so, and what will be produced will only be inferior goods.

"Uh-huh~Okay! Here's pretty much that's it. Sakura nodded in satisfaction and carefully placed the petri dishes on a special shelf.

Next, all you need to do is maintain that chakra and keep adding nutrients to it to ensure that it grows.

These things are cumbersome and not too technical, but someone must be on the sidelines.

"Then I'll leave it to you here. Sakura said to her by splitting an ice clone and infusing her with a large amount of chakra.

Because it's the same person, there's no need to dwell on anything, and the doppelganger already knows what she's supposed to do: in addition to maintaining the progress of the experiment, she also has a task of destroying all traces of it when it's discovered.

Especially when you are discovered by the Konoha ninja, you must remember to use the wind escape!

"Go, here I am!" said the ice clone.

Sakura Haruno nodded, picked up the stack of task lists that had been put aside, and turned to leave.

The bunch of tasks given to her by Tsunade would take ten days and half a month to complete in a hurry, and if she did it leisurely, it would take a month to do it. During this time, she can not return to Konoha, as long as she remembers to pass the completion of the task back.

As for when the task will be completed, it depends on whether Sakura Haruno is at full combat power, using a knife to kill chickens, or only showing her strength at the upper ninja level, or even using only an ice clone to complete the task......

Anyway, as long as you go back in time for the upper ninja combat test in five weeks' time, you can go back.

"Then, the first target is ......" appeared in the ice mirror on the ground in an instant, and Sakura Haruno took out the first task list and said as she looked at it.

"Hmm...... Because they are going to hibern, have these peripheral organizations been abandoned by Xiao?"

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