Undoubtedly, this black-robed person was none other than Jigen, parasitized by Isshiki Otsutsuki's 'Karma', or rather, Isshiki Otsutsuki himself!
Hiding in the Ninja World for a millennium, his situation wasn't much better than Black Zetsu's.
Because even though Kaguya Otsutsuki, who ambushed him back then, was sealed, as Kaguya Otsutsuki's sons, the Sage of Six Paths brothers obviously wouldn't welcome an Otsutsuki like him either.
And the Sage of Six Paths brothers successfully sealed even Kaguya Otsutsuki who had consumed the 'Chakra Fruit'. Once he revealed his trace, his fate would only be the same as Kaguya Otsutsuki, being miserably sealed. So over the millenniums, he paid great attention to hiding his whereabouts.
Of course.
This was also related to him searching for a 'vessel' that could accommodate him in the dark, and not intervening in various major events in the Ninja World.
Watching Karin, Mumei, and Sasuke leave, suspicion arose in his heart: "They are investigating me? Is there a problem with the Akatsuki Organization?"
Obviously, the 'Akatsuki Organization' he referred to wasn't Shinji's, but Nagato's.
For thousands of years, he had been a conscientious bystander, gradually getting used to watching the changes in the Ninja World from the audience's perspective.
Unexpectedly, just as he had a thought and tried to contact Nagato, Kaguya Otsutsuki's descendants noticed it.
That's right, after seeing Shinji successfully seal the Ten-Tails as 'A' of the Akatsuki Organization, he felt an unprecedented sense of crisis.
Because he could feel that 'A' wasn't the 'Sage of Six Paths'. He wouldn't be stupid enough to split the Ten-Tails and distribute his chakra to all disciples in the Ninshu, burying his possibility of impacting 'Kekkei Mōra' with his own hands.
Once 'A' grew up, he would very likely become the second Kaguya Otsutsuki, suppressing the Ninja World forever!
By then, even if he found a 'vessel' to accommodate himself and recovered his original strength, he wouldn't be 'A's opponent.
Thinking that there might never be a day to turn over, he risked contacting Nagato's gang defeated by 'A', trying to defeat 'A' with the help of Nagato's gang's power.
However, before he could reach any agreement with Nagato, 'A's subordinates began searching for him all over the Ninja World. This forced him to suspect that Nagato leaked his information, attracting 'A's retaliation for him.
Originally, he planned to take down these people investigating him and interrogate them about 'A's intelligence by the way, but after weighing the pros and cons, he gave up this idea and quietly left the small town.
This wasn't out of kindness, purely because Karin and Mumei were too strong.
With Jigen's body he parasitized, unless he completely liberated 'Karma', he had no chance of winning at all.
But once 'Karma' was liberated, he would need a 'vessel' to accommodate his chakra, otherwise he would die in the true sense, so he could only endure temporarily.
After leaving the small town, he activated Space-Time Ninjutsu leaving the Land of Demons, crossed the entire Ninja World continent, and came to the Land of Tea isolated overseas.
Walking into an underground base familiarly, he found Nagato hiding inside.
After the Fourth Great Ninja War, the disheartened Nagato and Konan came to the Land of Tea together and lived in seclusion here.
Because the Rinnegan was taken by Shinji, Konan found a pair of ordinary eyes for Nagato to replace, barely restoring Nagato's vision.
Seeing Jigen visit again, Nagato said coldly: "I have already made it very clear, I am not interested in your proposal!"
Konan aside was also ready for battle: "Please leave here!"
Jigen questioned: "What, aren't you going to give me a reasonable explanation?"
Nagato raised an eyebrow: "What explanation do you want?"
Jigen's expression gradually turned cold: "'A's subordinates are investigating me all over the Ninja World, don't tell me you don't know?"
Nagato didn't explain much: "Nothing to do with us!"
Konan secretly activated ninjutsu, activating all paper bombs around her.
When Jigen first came to the door, she had fought with Jigen. Although that battle was stopped by Nagato, she knew very well that this guy with no reputation in the Ninja World was outrageously strong, not something she could deal with, so she was very wary of Jigen.
Looking at Konan's posture ready to perish together, Jigen chuckled disdainfully: "Forget it, since you can't be used by me, then I have no choice but to get rid of you!"
"!?"
Konan was shocked, immediately waved her hands, controlling countless paper bombs folded into shuriken around to attack Jigen.
Rumble...
Instantly, a series of explosions rang out in the underground base. For a moment, rumblings continued, smoke and dust rose everywhere!
Looking at the billowing smoke in front, Konan asked Nagato: "Solved?"
Nagato shook his head: "Probably not!"
Although without the Rinnegan, Nagato's perception ability was still there, experience and judgment were also there, so he felt the opponent shouldn't be dead.
Swish swish
Just then, accompanied by the sharp whistling of breaking wind, something flew out of the smoke and dust, shooting towards Nagato and Konan.
If the Rinnegan was still there, Nagato could definitely perceive it, but right now in his eye sockets were just a pair of ordinary eyes. Konan beside him also didn't have dojutsu Kekkei Genkai. Inside the underground base with rolling smoke and dust, they couldn't make effective evasions at all, only able to parry relying on intuition and experience.
Clang clang clang...
Soon, with a series of metal clashing sounds, Nagato blocked quite a few hidden weapons attacking from the smoke and dust with the kunai in his hand, but two hidden weapons still hit his arm.
He looked down, expression instantly changing greatly: "Black Receiver!?"
It turned out the hidden weapons attacking from the smoke and dust weren't ninja tools like kunai or shuriken, but Black Receivers he was very familiar with.
One must know Black Receivers were products of Yin-Yang Release, generally only people possessing Rinnegan could create and use them. So he never thought this mysterious monk calling himself 'Jigen' in front could actually use Black Receivers.
Thump thump!
Nagato was stunned, as if his heart was gripped by an invisible hand, squatting halfway to the ground in pain.
Undoubtedly, this was the opponent interfering and controlling the chakra in his body through the Black Receivers. He was very familiar with this move, because previously he was the one using this move to control others.
Konan seeing Nagato suddenly squat down, hurriedly rushed over: "Nagato, are you okay?"
Nagato said: "Run quickly, we are not his opponent!"
Konan also noticed the Black Receivers on Nagato's arm at this time, exclaiming: "Black Receiver? How is this possible!?"
Nagato pushed Konan: "Go, I'll hold him back!"
Exchanging a glance with Nagato, Konan immediately understood Nagato's meaning. If she didn't leave, both would die here. As long as she successfully escaped, there would still be a chance to rescue Nagato.
Thus, Konan steeled her heart, activated the traps arranged long ago, creating serial explosions inside the base, then taking advantage of the convenience of Paper Release flight, she escaped the base from the ventilation duct...