Outer sea, Turtle Island.
Looking at the distant waterfall, Jiraiya paced back and forth anxiously: "That brat Naruto, why hasn't he come out yet!"
Yakumo at the side said: "Jiraiya-Leader, you don't need to worry, I am here!"
Jiraiya nodded, then sat on the ground.
After their group arrived at the Hidden Cloud Village, under Killer B's leadership, they arrived at this giant Turtle Island located on the outer sea.
Here, Naruto began a new round of special training.
Compared to the Hidden Leaf's Jinchuriki, the Hidden Cloud's generations of Jinchuriki were all selected from ordinary shinobi, so amidst constant failures, they summarized a complete set of methods for training Jinchuriki.
By this generation, this set of Jinchuriki training methods was gradually perfected. As beneficiaries, the Eight-Tails Jinchuriki Killer B and the Two-Tails Jinchuriki Yugito Nii successively became perfect Jinchuriki, gradually widening the gap with Jinchuriki of other villages.
This was originally the Hidden Cloud's unshared secret. If not for the threat of the Akatsuki organization being too huge, and the entire Ninja World being in danger of being subverted by it, they would not have easily opened it up to Naruto.
And the first lesson after getting on Turtle Island was the taijutsu test from Killer B.
Naruto's taijutsu was not bad among his peers, but due to insufficient mastery of the Multi Shadow Clone Jutsu and Rasengan, his tactical system was not perfect enough, full of flaws.
If he encountered an ordinary enemy, he could still use a large number of Shadow Clones to pile up. But if he encountered a top expert in taijutsu like Killer B, sheer numbers would not work, so in this first lesson of the taijutsu test, Naruto suffered quite a bit.
Being beaten black and blue time and again, let alone Naruto himself, even the accompanying Yakumo and Jiraiya couldn't bear to watch.
Fortunately, his progress was obvious, slowly showing extraordinary taijutsu talent.
For a period of time after, Killer B began to guide Naruto on how to undergo Tailed Beast Transformation.
During the Tailed Beast Transformation training, losing control and going berserk was naturally unavoidable, so Yakumo was exhausted these days. If not for transplanting Hashira cells which greatly increased her physique, she really couldn't have been the nanny for Naruto, a Jinchuriki with infinite energy.
After continuous failures, Killer B was too lazy to practice with Naruto day by day, so he let the Hidden Cloud shinobi Motoi, who was stationed on Turtle Island, be responsible for guiding Naruto.
Thus, Motoi took Naruto to the Waterfall of Truth on the island, telling Naruto that only by facing the darkness in his heart could he become pure in heart like Killer B and become a perfect Jinchuriki. So Naruto walked into the Waterfall of Truth under the gaze of Jiraiya and Yakumo.
Inside the Waterfall of Truth.
The restless Naruto spent quite a while before barely calming down. And when he calmed down, a voice suddenly appeared in his ear: "Is it fun getting beaten up constantly like a fool?"
Naruto looked up, looking around: "Who!?"
At this time, a figure vaguely appeared in the waterfall in front of him. That figure looked at him through the water curtain, and the voice just now was issued by this figure in the waterfall.
That figure continued: "You clearly hate being looked down upon by Sasuke, so why do you go help him again? Isn't it good to let him make a fool of himself? Don't you know that the one Sakura truly likes is him?"
Naruto flew into a rage: "What nonsense are you talking about!"
"Angry?" Smiling, the figure in the waterfall said: "I hit the mark, right! Sakura doesn't like you at all. You are just a lapdog following behind her, hoping to be noticed by her, but her eyes only have Uchiha Sasuke!"
Naruto faltered: "I do not!"
The figure continued: "Don't lie to yourself. You hate them! You have never forgotten the cold looks you received in the village growing up. You hate that Shinji is better than you, you hate that Sakura doesn't like you, you hate that Sasuke always steals your limelight, you hate that Shikamaru is smarter than you, you hate that Killer B beats you up time and again, you hate everyone!"
Naruto's eyes were firm: "I do not!"
The figure in the waterfall smiled: "Naruto, you even deceived yourself!"
"Who exactly are you?"
Naruto was somewhat flustered.
He believed he was not like what the other party said, but every question of the other party happened to hit his heart, giving him a flustered feeling of having his thoughts seen through.
The figure in the waterfall took a step and slowly walked out of the water curtain: "You are me, I am you, stop lying to yourself!"
"This!?"
Naruto's expression changed, because the figure walking out of the waterfall was no one else, but actually himself!
...
In the distance.
Ido, who was idle in Yakumo's inner world, suddenly raised her head and sensed something, so she hurriedly said to Yakumo: "Yakumo, I smell something delicious, let me out quickly!"
Yakumo was stunned: "What?"
Heh...
Ido gave a wicked smile and explained: "A Heart Demon like me has appeared nearby. That thing is a great supplement for me. If I can swallow it, perhaps I can be free without the Koryugan!"
"Heart Demon?" Pausing, Yakumo's expression became a bit more serious: "How is that possible!"
A 'Heart Demon' was no ordinary thing. If an average person had problems in their heart, it could at most be called negative emotions. The generation of a 'Heart Demon' not only required extremely terrifying negative emotions but also a more important factor, which was independent will.
Just like Ido staying in Yakumo's inner world at this moment; she was Yakumo's Heart Demon, a consciousness that could act alone and think alone.
So negative emotions were common, but Heart Demons were very rare.
Just as Yakumo was dazed, the impatient Ido forcibly leaped out of Yakumo's inner world and flew toward the direction of the Waterfall of Truth!
Without the Koryugan, although Ido lost the ability to move freely, temporarily breaking away from Yakumo's body to wander nearby was still barely achievable.
Whoosh...
Flying above the Waterfall of Truth, Ido looked at the two Narutos fighting below, and a playful look immediately appeared on her face: "Ha, so it was Naruto who produced a Heart Demon! I didn't expect that kind of idiot could also produce a Heart Demon. Is it because of this Waterfall of Truth?"
At this time, Yakumo, realizing something was wrong with Naruto, also rushed to the edge of the Waterfall of Truth. And at this moment, Naruto stood motionless in the Waterfall of Truth, as if he had lost his soul.
Jiraiya and the Hidden Cloud's Motoi also followed. Seeing Yakumo's expression changing uncertainly, Jiraiya asked: "What's wrong?"
Yakumo hesitated a bit: "Naruto seems to have a problem!"
Jiraiya was somewhat worried: "Why is he motionless?"
The Hidden Cloud's Motoi explained: "This is very normal. He should be facing his own dark side right now. Only by defeating the dark side can he recognize the true self!"