The task of monitoring Black Zetsu was entirely entrusted to the Nine-Tails.
This wasn't difficult for the Nine-Tails. As long as Black Zetsu remained within the Hidden Leaf Village's borders and didn't wander too far, Kurama—no longer restrained by Kushina's Adamantine Sealing Chains—could sense his presence clearly.
After all, Black Zetsu had already been fully locked onto, so surveillance was no issue.
In truth, if he had the choice, Uchiha Kei would have preferred not to confront Black Zetsu at this time. If given the opportunity to bide his time and develop quietly, he was confident he'd eventually surpass even peak Madara with ease. The system's constant stream of rewards had made him feel like he'd joined the heavenly sect of Wind, Moon, and Shadow.
But reality had other plans—Black Zetsu had come to him, and worse, had shown clear hostility. Kurama was especially sensitive to such things, and his judgment was never wrong.
Just thinking about how Black Zetsu could secretly manipulate and eliminate people—even managing to deceive Madara Uchiha—made Uchiha Kei lose sleep. He wouldn't feel at ease until Black Zetsu was dealt with.
When facing such a filial zealot dead set on saving his mother, Uchiha Kei felt that unless he could contact Ōtsutsuki Kaguya and have her talk sense into Black Zetsu, any attempt at cooperation would be like trying to skin a tiger without getting mauled.
So—Black Zetsu had to go.
Even if he couldn't be destroyed or sealed, he had to be scared off.
Could it work?
Uchiha Kei narrowed his eyes as he thought about the power he had at hand.
Whether it could or not—he had to try.
With that, Uchiha Kei gathered his trusted allies, added everyone on WeChat, and created a new group chat. In it, he added Orochimaru, Tsunade, Minato Namikaze, Kurama, and Kushina Uzumaki.
As for Kikyo Uzumaki and Nawaki, Kei didn't include them. Their strength was too lacking, and knowing about this would only bring them unnecessary stress.
Young people should enjoy their youth and not get involved in things beyond them. Even Naruto Uzumaki and Sasuke Uchiha were still in their leveling-up stage at Kikyo and Nawaki's age.
This brand-new concept intrigued everyone in the group. Though not as unhinged as netizens from Kei's previous life, they quickly adopted a casual chatting style, akin to an elderly WeChat group basking in the golden years.
All it needed now was a flood of clickbait articles to be complete.
Then Uchiha Kei spoke up in the group:
\[Kei: Everyone, quiet down. You can explore the WeChat functions later. Right now, let me explain why I created this group.]
With that, Uchiha Kei pasted a long message filled with details on Black Zetsu and White Zetsu—roughly the same information he had shared with the Uchiha clan, only more detailed.
Everyone immediately turned serious as they read.
Orochimaru was the first to finish, his eyes gleaming with excitement. He messaged Kei privately:
\[Orochimaru: Kei-kun, is all that information you shared real? You're saying beings like White Zetsu and Black Zetsu actually exist? I don't mean to doubt you, it's just... they're astounding. That White Zetsu sounds like it shares roots with the First Hokage's Wood Style—practically a walking plant.]
\[Orochimaru: And Black Zetsu... a soft-bodied creature immune to ninjutsu, able to possess others—its form overturns everything we know about chakra biology. It feels like it was born just to counter shinobi.]
\[Orochimaru: Fascinating. Did you get all this from that illusionary world of yours?]
To this, Uchiha Kei naturally replied—
\[Kei: Yes, Orochimaru-sama. That's exactly what Black Zetsu and White Zetsu are. In the upcoming operation, I'll try to capture some White Zetsu specimens for your research. As for Black Zetsu, he's too dangerous and slippery. Our current technology can't restrain him. At best, we might be able to seal him temporarily, but even that's not guaranteed.]
\[Orochimaru: That's a shame. I'd love to study a being like Black Zetsu. But even just White Zetsu... Kei-kun, if my guess is correct, White Zetsu might be the key to solving the issue of Hashirama's cells being too aggressive for normal shinobi to handle.]
After reading that, Uchiha Kei could only marvel—truly worthy of the title "first scientist of the shinobi world." With just a bit of written intel, Orochimaru had already theorized this much. Give this genius a hint, and he could reshape the world.
That said, current technology and resources were still lacking. Konoha wasn't ready to support Orochimaru's ambitions. Not yet.
Still, Orochimaru's interest was fully piqued. Within the mental world library, his true consciousness smiled with glee as he brainstormed ways to deal with Black Zetsu.
Meanwhile, others had also finished reading the info—and were all deeply unsettled.
\[Tsunade: Are you kidding me? Kei brat, are you seriously telling me these things exist in the shinobi world?!]
\[Minato: Immune to ninjutsu... nearly impervious to taijutsu... only high-level sealing techniques seem effective...]
\[Kushina Uzumaki: Looks like the Uzumaki clan is the best suited to handle this so-called Black Zetsu.]
\[Kurama: ...]
Kurama was silent in the group. After a moment, he messaged Uchiha Kei privately:
\[Kurama: Kei brat... are you sure that was White Zetsu?]
As a Tailed Beast created by the Sage of Six Paths, Kurama naturally knew about White Zetsu. He even knew that Kaguya Ōtsutsuki had created them by mutating humans into bio-weapons.
Ever since Kaguya was sealed by her two sons, the White Zetsu army vanished without a trace. Kurama hadn't expected to hear about them again after all these centuries.
As for Black Zetsu, he genuinely didn't know. After all, Black Zetsu had been created just before Kaguya's sealing—neither the Sage of Six Paths nor his brother had known of its existence.
Still, Kurama wasn't surprised that Uchiha Kei knew. He had long accepted that Kei was the prophesied one mentioned by the Sage and likely received much of this knowledge from him.
Kei confirmed everything for Kurama, and in private, shared even more than he had with the others—explaining that Black Zetsu was actually Kaguya Ōtsutsuki's third son, a fragment of her will manifested before her sealing.
This revelation stunned Kurama so much his fur practically stood on end.
To the Tailed Beasts, the Sage of Six Paths was like a father. But his mother—Kaguya—was a nightmare. The progenitor of chakra, the Rabbit Goddess, the origin of all chakra—and the entity most feared by the Tailed Beasts.
Kaguya could consume them all, wiping them from existence.
Learning that Black Zetsu was her hidden third son—a being even the Sage didn't know about—shook Kurama to his core. He wasn't just sweating—his entire chakra body flared up in horror.
Naturally, Uchiha Kei reassured him. He reminded Kurama that while Black Zetsu had spent a millennium scheming to free Kaguya, he wasn't powerful himself. His true danger came from stealth and his unique Yin-Yang Release nature.
If they could counter those two things, Black Zetsu was basically an unkillable blob.
Fortunately, Kurama's positive-negative emotion sensing ability perfectly countered his stealth, and sealing jutsu could theoretically neutralize his form. So from a theoretical standpoint, Black Zetsu wasn't an unsolvable threat.
Of course, theory and practice are two different things. Kei's attitude was clear—try sealing him first. If that fails, find another way.
Kurama's biggest role would be acting as a precision radar, keeping constant track of Black Zetsu's movements. They couldn't allow him to escape.
Kurama agreed—no hesitation. With Kaguya involved, even the strongest Tailed Beast had to give it everything. If Black Zetsu actually managed to unseal her, it was game over.
As for the info on Kaguya and the Sage of Six Paths, Kei hadn't shared that with the others, and Kurama wouldn't either. The implications were too great. Revealing it could bring catastrophe.
Kurama worried that Black Zetsu might go deeper into hiding. Kei, meanwhile, was concerned that members of Kara—the organization introduced in *Boruto*—might show up. If that happened, then even scarier beings like Isshiki Ōtsutsuki might appear. A monster with worse lore than Kaguya but far less impactful presence.
If the story truly shifted into *Boruto* territory, Kei might as well wash his hands and await his fate. There was no way Konoha could deal with threats of that scale.