Naruto: Uchiha Survivor Forced to Save the Shinobi World-Chapter 374: Leek Field

Uchiha Shinji immediately gave his approval: "The seal's effect is impressive, strong enough to block the perception of ordinary sensory shinobi."

"Awesome!"

Karin beamed with joy.

After circling Karin and observing her, Shinji offered a few pointers: "However, the sealing technique is still a bit rough. You should practice more when you get back to reduce the risk of exposure. Also, your chakra is too vast right now. The seals inscribed on objects can't sustain themselves without a constant chakra supply, so their effectiveness will fade quickly. You'll need to maintain them daily."

"Got it!"

Karin took mental notes of everything.

Shinji didn't linger on the topic, instructing her, "Head back now, and be careful on the way!"

After Karin left, Shinji didn't rush to leave. Instead, he meticulously cleaned the cave, erasing every trace—withered trees caused by Karin's chakra outburst during the surgery, spilled suppressant, all of it. Only then did he silently depart.

Back at his apartment, Shinji couldn't suppress the excitement in his heart. After a quick shower in the bathroom, his mind finally began to settle.

He sat at his desk, opened his notebook, and began reviewing the three First Hokage cell transplant surgeries: Yakumo, the Sand Village volunteer, and Karin.

After conducting these three procedures, he could confidently call himself an expert in this field. Still, he knew the medical shinobi overseeing the surgery played a relatively minor role. The true determinant of success was the shinobi lying on the operating table, receiving the transplant.

Even so, Shinji was determined to refine every detail, doing everything in his power to boost the surgery's success rate. This wasn't driven by some noble research spirit—it was purely preparation for his own eventual First Hokage cell transplant.

If he were the one on the table, some of his fallback techniques might not be reliable. He wasn't sure if he could balance yin-yang chakra while simultaneously activating Jikibi and Wazunagi.

"Tsunade's fusion agent has proven effective."

"Placing the transplant site on the limbs does help mitigate the initial chakra surge's impact on internal organs."

"Dojutsu is the key to fusion."

"Suppressant..."

When he reached the suppressant, Shinji paused his writing.

Witnessing Karin endure the chakra outburst in her body left him shaken even now. He wasn't certain he could achieve perfect fusion without relying on suppressants like she did. What Karin could accomplish didn't necessarily mean he could.

Though he'd received several blessings from the shinobi world, greatly enhancing his chakra reserves, his physique was far more ordinary compared to Karin's. Injuries she could grit her teeth through might be fatal to him.

But he had his own advantages.

As an Uchiha, his Eternal Mangekyo Sharingan's dojutsu was far stronger than Karin's before her surgery.

"There's still room to optimize the details."

As Shinji mulled this over, he closed his notebook, his thoughts drifting to the Rinnegan Plan.

At this stage, his Rinnegan Plan was essentially complete. Through his careful scheming, Karin had acquired a pair of Eternal Mangekyo Sharingan tied to her bloodline and First Hokage cells. The foundational conditions for awakening the Rinnegan were met.

Now, all Shinji could do was wait.

Even with all conditions fulfilled, the timing of the Rinnegan's awakening was unpredictable.

The only successful case in the shinobi world's thousand-year history was Uchiha Madara, who barely awakened the Rinnegan near the end of his life. From acquiring First Hokage cells after the Valley of the End to finally awakening the Rinnegan, decades had likely passed—Shinji couldn't verify the exact timeline, but it was undoubtedly lengthy.

Tap.

Tap.

Lightly tapping his pen on the desk, Shinji gazed out the window.

Though Madara was the only success in a millennium, his case was unique and not entirely applicable. When he pursued the Rinnegan, he only had one Eternal Mangekyo Sharingan. The impact of this on awakening the Rinnegan was something only Madara himself likely understood.

Karin didn't have this issue, so Madara's case couldn't be directly applied to her.

"The All Creation Power of yin-yang unity is the key to awakening the Rinnegan. As long as Karin's body continuously generates even the faintest All Creation Power, she's effectively pursuing the Rinnegan."

Shinji devised a criterion to judge whether Karin's pursuit of the Rinnegan had failed. This standard wasn't tied to time but to whether her body could consistently produce All Creation Power. Only All Creation Power could trigger the qualitative transformation needed.

Mere increases in chakra volume were meaningless without it.

As long as Karin continuously generated All Creation Power—even if it took ten or twenty years—her pursuit couldn't be deemed a failure. But if her body stopped producing it, losing the factor needed for transformation, then her attempt could be considered a failure.

For most, detecting whether Karin's body was still producing All Creation Power would be nearly impossible. But for Shinji, with his Jikibi, no change in her body could escape his scrutiny. Jikibi was directly linked to the spiritual body, and few factors could strengthen it—All Creation Power being one of the most prominent.

By monitoring whether Karin's spiritual body continued to grow, Shinji could easily determine if her body was still producing All Creation Power.

"I hope Karin succeeds soon," Shinji thought, filled with anticipation.

If Karin succeeded, it would validate his approach and accelerate his own pursuit of the Rinnegan. Once Karin awakened the Rinnegan through her own power, she'd become a steady "leek field" producing All Creation Power.

Using Wazunagi as his sickle, Shinji could repeatedly harvest the "leeks" he'd planted in Karin. Though Wazunagi's extraction came with some loss, and absorbing another's All Creation Power was less effective than fusing it himself, consistent absorption would steadily enhance his dojutsu and physique, optimizing his condition.

Perhaps, right after completing his own First Hokage cell transplant, he could leverage this accumulated power to swiftly awaken the Rinnegan.