Naruto: Uchiha Survivor Forced to Save the Shinobi World

After a moment, Neji snapped out of his excitement and cautiously stepped away from the massive Tenseigan.

In just that short time, his body was brimming with Tenseigan chakra.

It was so much he couldn't contain it!

To the massive Tenseigan, this amount was negligible, barely noticeable even to the Otsutsuki branch family controlling it. But for Neji, it was overwhelming.

Only then did Shinji speak, "Now you know why I brought you here, right?"

"I never imagined my Byakugan could resonate with this massive Tenseigan! Leader, what's going on?"

Neji's face was full of shock; the experience had caught him off guard.

Shinji gazed at the Tenseigan, filled with awe, "Because it's not just the Otsutsuki branch family's treasure—it's a treasure for all Byakugan wielders!"

Neji nodded slightly.

With his body filled with Tenseigan chakra, he felt an unprecedented surge of boundless energy.

Shinji approached Neji, instructing him to sit cross-legged while forming hand signs to activate the 'biological exoskeleton' in Neji's chest.

Normally, the exoskeleton implanted in Neji remained dormant most of the time, only briefly activating to collect his cellular tissue and store his chakra.

This was because Neji's current physique couldn't withstand prolonged collection and absorption.

But with the massive Tenseigan, everything changed.

As Shinji manually activated the exoskeleton, the chakra Neji had just gained from the Tenseigan was fully absorbed into it.

Fueled by this influx of Tenseigan chakra, the exoskeleton's growth surged noticeably.

Shinji silently calculated.

Relying solely on Neji, it might have taken years for his half of the exoskeleton to fully develop and store enough chakra.

Now, with the Tenseigan's aid, it could reach optimal condition in just a few months.

Shinji's earlier concern—that Neji's chakra wouldn't be strong enough to fuse with Kimimaro's at the final stage—was no longer an issue.

No matter how potent Kimimaro's chakra was, it couldn't surpass Tenseigan chakra!

Neji, somewhat weakened, said, "Leader, all the Tenseigan chakra in my body was absorbed by the exoskeleton."

Shinji instructed, "That's fine. Resonate with the Tenseigan again, absorb more chakra, and feed it to the exoskeleton."

Neji asked, puzzled, "Feed it all to the exoskeleton?"

Shinji nodded, "The exoskeleton I implanted in you requires your chakra to grow. But your strength alone isn't enough to sustain it, so I brought you here to absorb Tenseigan chakra to nourish it and speed up its development!"

After a moment's hesitation, Neji asked, "What will it become once it's fully developed?"

Sensing Neji's concern, Shinji reassured him, "Don't worry. Once it's fully developed, I'll remove it from your body—it won't harm you! Plus, during its growth, it'll subtly improve your physique, so nourishing it only benefits you!"

If it were anyone else, Neji wouldn't have trusted them so easily.

But since it was the leader, he dispelled his doubts and followed Shinji's instructions.

After repeating the process four times, Neji was so exhausted he could barely stand.

Absorbing Tenseigan chakra through resonance and feeding it all to the exoskeleton seemed simple, but it took a heavy toll on Neji's body. His chakra-storing cells grew fatigued, and the rapid cycle of 'filling' and 'emptying' in such a short time was a significant strain on his entire cellular structure.

It was akin to when Shinji had his chakra drained by Toneri. Even with a chakra infusion afterward, it took him three days to fully recover.

Steadying Neji, who nearly collapsed, Shinji said, "That's enough for today!"

Catching his breath, Neji asked, "Leader, how many times do I need to nourish it to fully develop the exoskeleton?"

Shinji estimated, "If you nourish it like today, about four times a month, I'd say a few months should do it."

Neji nodded, "Understood!"

After this session, Neji's body would need a few days to recover, so Shinji didn't linger. He immediately led Neji out of the shrine.

In the blink of an eye, a month passed.

During this time, Shinji was swamped.

In the Hidden Leaf, he monitored Karin, Kimimaro, and Neji's conditions while dealing with Koharu.

Every few days, he took Neji to the moon to secretly absorb Tenseigan chakra to nourish the exoskeleton.

Fortunately, their multiple infiltrations went undetected by the Otsutsuki branch family.

Through Jikibi's connection, Shinji precisely tracked the development of the exoskeletons in Neji and Kimimaro.

Initially, Kimimaro's half of the exoskeleton was developing faster than Neji's.

But as Neji repeatedly siphoned high-quality Tenseigan chakra to nourish his exoskeleton, its growth rate quickly caught up and surpassed Kimimaro's.

Now, both exoskeletons were developing rapidly. At this pace, Shinji estimated Neji's would reach optimal condition in about two months, while Kimimaro's would take three to four months at most.

When that time came, Shinji could use Jikibi's link and Wazunagi's fusion to open a void passage, merging the two halves into one, cleverly combining Neji and Kimimaro's cellular tissue and chakra.

This would yield a complete exoskeleton perfectly compatible with the Hyuga clan's Byakugan chakra and the Kaguya clan's Shikotsumyaku chakra.

Once this step was complete, the hardest part of his 'Tenseigan Plan' would be done.