Naruto: Uchiha Survivor Forced to Save the Shinobi World

The intense yin-yang clash within Karin's body continued unabated.

Through 'Jikibi,' Shinji meticulously monitored everything happening inside her, analyzing and recording in real-time.

"The 'All Creation Power' Karin produced earlier has been a huge help. Looks like my steps hit the mark by sheer luck…"

Shinji gave a wry smile.

According to his 'Rinnegan Plan,' he had hoped Karin could awaken the Rinnegan by fusing with the Eternal Mangekyō Sharingan and transplanting the First Hokage's cells alone.

Now, it was clear his original plan was fundamentally unworkable.

Without Ōtsutsuki Indra's chakra, even possessing a pair of Eternal Mangekyō Sharingan couldn't achieve the pinnacle Yin Release chakra required for the Rinnegan.

However, his approach had maximized Karin's physique and dojutsu power.

If not for the 'All Creation Power' she had previously generated, stabilizing her condition, she wouldn't have withstood such an intense yin-yang clash so easily.

Time ticked by slowly.

The fierce yin-yang clash gradually evolved into yin-yang fusion.

Decades after Uchiha Madara successfully awakened the Rinnegan, on this unremarkable night, the chakra of the fated rivals Ōtsutsuki Asura and Ōtsutsuki Indra began to fuse once more!

The pinnacle Yang Release chakra and pinnacle Yin Release chakra merged, rapidly undergoing a qualitative transformation. A torrent of 'All Creation Power' surged forth, flooding Karin's body.

"So much…"

Shinji was quietly astonished.

Judging solely by the volume of 'All Creation Power' produced, he knew he was on the right path this time.

In the blink of an eye, six hours passed, and the first rays of dawn faintly appeared on the horizon.

Having stayed up all night, Shinji wasn't the least bit tired, but he knew he had to stop. Otherwise, even if he and Karin could endure, Sasuke wouldn't!

After halting 'Wazunagi,' Shinji ignored Sasuke and contacted Karin via 'Jikibi,' asking, "How do you feel?"

Karin hurriedly replied, "My lord, it's incredible! Whose chakra did you send me? It's so pure!"

"You don't need to know that for now." Shinji paused, then asked, "Tell me about your sensations."

Karin had only asked casually, so she quickly followed Shinji's lead: "The 'All Creation Power' I produced tonight surpasses everything from the past week combined! I feel my dojutsu power rising again—and it's a significant leap!"

Shinji, still cautious, asked, "No discomfort at all?"

Karin shook her head: "None so far. I'm in excellent condition!"

After confirming Karin's status, Shinji cut off 'Jikibi,' opened his notebook, and began recording while reflecting.

A single chakra infusion was clearly insufficient to awaken the Rinnegan.

Based on the information Shinji had gathered, combined with his knowledge of the Naruto world, awakening the Rinnegan required not only sufficient 'All Creation Power' but also an immense accumulation of chakra.

Uchiha Madara had spent decades amassing the chakra needed to awaken the Rinnegan.

Considering his unique circumstances—having only one Eternal Mangekyō Sharingan, which hindered his accumulation of 'All Creation Power,' and being an Uchiha, making it difficult to gather the vast chakra needed—it was a special case that took him decades.

Karin's current situation was, in many ways, far better than Madara's after his defeat at the Valley of the End.

Thus, Shinji estimated that as long as Karin accumulated enough 'All Creation Power' and chakra, she should be able to awaken the Rinnegan instantly.

When it came to gathering 'All Creation Power,' Shinji couldn't offer much help.

But for amassing chakra, he could provide Karin with assistance.

At critical moments, he could channel the chakra of everyone marked by 'Jikibi' to Karin through 'Wazunagi,' including his own!

"If that's still not enough…"

Shinji set down his pen, glancing at the sky outside his window.

The chakra Madara accumulated over decades was likely more than what Shinji and all those marked by 'Jikibi' could muster combined.

But Shinji had another option: the Ōtsutsuki clan's treasure, the colossal Tenseigan on the moon!

As a Six Paths-level artifact, the colossal Tenseigan's chakra reserves could easily fuel the awakening of a pair of Rinnegan. If it came to it, Shinji could even smuggle Karin to the moon, tapping into the Tenseigan's chakra in the Ōtsutsuki Branch Family's temple while pursuing the Rinnegan!

Of course, that would significantly increase the risk of detection by the Ōtsutsuki Branch Family. Unless absolutely necessary, Shinji didn't want to resort to that.

After collecting his thoughts, Shinji washed up briefly and headed to school.

"Yawn…"

On the way to the ninja academy, Sasuke, sporting dark circles and sunken eyes, let out a long yawn.

He hadn't slept a wink last night!

At first, he was too excited to sleep. Not only had he awakened the Mangekyō Sharingan, but Shinji had survived—a perfect outcome in his eyes.

But when Shinji began extracting his chakra with 'Wazunagi,' his nightmare began.

"That bastard A drained my chakra all night! Damn it!"

He gritted his teeth, cursing Shinji inwardly.

Per their agreement, he'd thought 'A' would only take a small amount of chakra. Initially, the amount was indeed minor, bearable for someone with his newly awakened Mangekyō Sharingan.

But as time passed, he realized something was off. Still, he held his pride, thinking, I'm a Mangekyō Uchiha now, on the same level as 'A' and 'B.' If I can't handle a little chakra drain, where's my dignity?

Clenching his teeth, he endured the entire night.

At the ninja academy, Sasuke stood on the training field, scanning the crowd.

Sakura approached, looking shocked: "Sasuke, what… what happened to you?"

Sasuke snorted coldly: "I'm fine!"

Sakura hesitated, then said, "Maybe we should go to the hospital?"

"Don't get in my way!"

Sasuke shot her a fierce glare.

Then, he spotted Yakumo appearing at the school gates and strode toward her.

That's right!

He was going to challenge Yakumo. He had no intention of hiding that he'd awakened the Mangekyō Sharingan. By challenging Yakumo, who had once faced 'B,' he aimed to gauge his mastery of the Mangekyō Sharingan.