At this moment, Uchiha Kiyo felt a tinge of regret.
"I shouldn't have stabbed him directly in the back."
Sighing, he patted his forehead and stored the spy's body in a scroll.
He examined the half-fist-sized hole in the corpse's chest and let out a wry smile.
"Such a serious injury is troublesome to treat."
Shaking his head, Kiyo formed a hand seal, and a dark green light appeared in his palms.
Placing his hands over the wound, he channeled Yang Release Chakra, stimulating rapid cell division in the affected area.
Gradually, the fatal injury began to shrink.
After half an hour, the wound had completely healed.
However, the price was steep—Uchiha Kiyo had expended nearly all of his chakra.
If not for the absence of a soul, the body looked almost indistinguishable from that of a living person.
After double-checking his work to confirm there were no issues, Kiyo noticed that the curse mark on the spy's tongue had dissipated along with the soul's departure. Satisfied, he sat down and began to restore his chakra.
Taking out a military ration pill, he popped it into his mouth and activated Yuanyuan Gong.
Over the past year, Kiyo had utilized his chakra control to polish several lenses and piece together a rudimentary microscope based on the optical principles he remembered from his past life.
Using this crude instrument, he had spent long hours observing cells and studying chakra refinement techniques used by captured enemy ninjas. During this process, he had inadvertently discovered a way to construct a model capable of extracting physical energy more efficiently.
At this moment, Kiyo focused on his stomach, constructing an intricate chakra model with precise control. The model wrapped around his digestive system, activating his body's ability to extract and refine physical energy from food.
Regarding physical energy extraction, there was actually no issue.
Unlike Natural Energy, which carried wild and untamed properties, the energy in food had already been processed through the food chain. This made it much gentler and beneficial for the body.
While refining physical energy, Kiyo simultaneously controlled his mental energy to fuse it into chakra, preventing any excess loss.
Under his mastery of Yang Release Techniques, the energy from the military ration pill was rapidly converted and merged with his spiritual energy, forming new chakra.
In just a few moments, he had recovered nearly all the chakra he had spent earlier.
Kiyo then formed a Ram Seal.
"Bang!" "Bang!" "Bang!"
Three Shadow Clones appeared beside him.
Without speaking, Kiyo swallowed another military ration pill and continued restoring his chakra while the clones got to work.
The three clones cooperated seamlessly, inscribing various sealing formulas onto the corpse.
Heart, limbs, head…
One by one, Kiyo meticulously engraved the required Fuinjutsu symbols on the corpse. Once the final inscription was completed, all the seals linked together, forming a cohesive network hidden beneath the skin.
By this point, the clones had finished inscribing the necessary seals, and Kiyo himself had fully recovered his chakra.
Forming another Ram Seal, he summoned a fourth Shadow Clone—this one infused with half of his chakra, more than 4,200 units.
Kiyo nodded at the newly summoned clone, who immediately began preparing the necessary seals.
"Five Elements Seal!"
As Kiyo activated the seal, space around the fourth clone began to distort. Under his control, the shadow clone was sealed into the corpse's body. A circular Fuinjutsu mark appeared on the corpse's abdomen.
"Phew… finally done."
The once-lifeless corpse suddenly opened its eyes.
With stiff, mechanical movements, it sat up, then slowly stood, stretching its limbs.
As the clone-controlled body continued moving, the stiffness gradually faded, and its actions became smoother.
This was the secret Clone Technique that Uchiha Kiyo had been developing for a long time.
Ordinary Shadow Clones and similar techniques had a major limitation: unless sealed in advance, they couldn't stray too far from the original body.
The distance varied depending on the user's chakra reserves. Most shinobi couldn't keep a clone more than five kilometers away. However, in the Naruto manga, we saw examples of clones fighting in multiple battlefields simultaneously.
For most shinobi, the limited chakra reserves meant clones had to remain relatively close. Kiyo himself was no exception.
To break through this restriction, he devised this secret technique.
Even when sealed in advance, traditional clones would dissipate the moment the seal was released. Their duration was too short for extended missions.
However, Kiyo discovered that Fuinjutsu could help clones remain active over long distances. This led him to an idea—
"What if I could store a clone inside a body, similar to a Jinchuriki storing a Tailed Beast?"
Using the Five Elements Seal as a foundation, he made minor modifications, integrating chakra-solidified Fuinjutsu into the design. With this, even while sealed, the Shadow Clone could manipulate the body using these seals—essentially controlling it remotely.
In simpler terms, Kiyo had created a remote-controlled human puppet.
As long as the sealed Shadow Clone had chakra, the body would remain active indefinitely.
And if he could find a way to replenish the clone's chakra while it was sealed, this puppet could theoretically operate forever.
"Mom no longer has to worry about my robot running out of battery..."
Due to the nature of the Fuinjutsu, the Shadow Clone inside consumed very little chakra—most of the energy was spent controlling the body.
To prevent the corpse from decaying, Kiyo maintained its basic biological functions with minimal chakra expenditure. His medical ninjutsu expertise ensured that, under these conditions, the body could function for up to three months before running out of chakra.
Of course, this only applied under normal circumstances.
If the Shadow Clone engaged in battle, its stamina and chakra would drain rapidly.
Since the body itself was still functional, it should be capable of refining chakra. However, Kiyo had yet to develop a method for the clone to extract new chakra.
---
For the next few hours, Kiyo remained in place, observing as the clone-controlled body adapted to its new form.
To accelerate the process, he had it spar against his three other Shadow Clones.
After three hours of rigorous combat, all four clones were exhausted.
Kiyo dispelled them, absorbing their experiences and memories.
The most critical data came from the clone sealed inside the body. With this information, future clones would no longer require an adaptation period.
Restoring his chakra to full capacity again, Kiyo repeated the process—
Four new Shadow Clones appeared.
Using the Five Elements Seal, he sealed all four into the body simultaneously.
Since they were all clones of the same person, they could be treated as a collective unit, making the sealing process much smoother.
Once inside, the four clones designated themselves as No. 1, No. 2, No. 3, and No. 4.
No. 1 took full control of the body, while the others remained in a dormant state, maintaining only minimal chakra consumption.
Uchiha Kiyo finally smiled in satisfaction.
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