Sasuke walked up to the tree and spoke coldly, "Chakra isn't about more being better, you idiot. Think of it as a thin film… not too much, not too little, just enough to stick to the soles of your feet."
Before the words even finished, he had already effortlessly walked up the tree trunk, then jumped down. The whole process took less than three seconds.
"See how it's done?" He glanced at Naruto, whose mouth was agape.
"Oh... oh, I see!" Naruto snapped back to reality and nodded vigorously.
He imitated Sasuke, closed his eyes to concentrate, then stomped fiercely onto the tree.
Bang!
The result was predictable. The bark shattered, and Naruto was thrown back again.
Sasuke watched this scene, his frown deepening.
He impatiently scolded, "Idiot, I told you not to use brute force! You need to attach Chakra to your feet!"
"I know, but it won't listen to me!" Naruto was almost crying in frustration. He felt the Chakra inside him was like a tangled mess.
"Won't listen?" Sasuke frowned.
'Chakra was the combination of a Shinobi's Physical and Spiritual Energy. How could there be such a thing as 'not listening'?'
'Unless his control was extremely poor… but this guy's perseverance and physical fitness were clearly strong...'
The three-tomoe Sharingan reappeared in Sasuke's eyes.
He wanted to see if it was because this idiot was incompetent or if there was another reason.
As the Sharingan rotated, the chaotic flow of Chakra within Naruto's body was laid bare.
"Something's wrong..." Sasuke's brow furrowed even tighter. He pushed his insight to the limit.
Then, he saw the root cause, and his pupils constricted sharply.
He saw that within Naruto's body, surrounding his own blue Chakra, there was another, completely different red Chakra coiling around it.
It is filled with a violent and ominous aura.
Whenever Naruto tried to condense his blue Chakra, that red Chakra would forcibly tear and interfere with his own.
'What is that?'
Sasuke felt an eerie familiarity within this Chakra filled with malice and hatred.
It was like the Hollows he had slain.
'So that's it...' Sasuke instantly understood the root of Naruto's failure.
'This wasn't just a simple control issue. There was something else parasitizing inside this guy's body.'
"Hey, idiot."
Sasuke's expression turned somewhat serious, "You, give me your hand."
He wanted to confirm what that red thing actually was.
Sasuke closed his eyes, transmitting Reiatsu through his hand.
The moment the Reiatsu made contact with Naruto, his consciousness was suddenly violently pulled, as if a deep pit had opened beneath him, sending him falling weightlessly.
By the time he regained his senses, he was already in a damp, dark underground waterway.
It was filled with a decaying, hatred-filled aura.
'Where is this?'
Sasuke looked around, sensing a familiar power… the same power that had interfered when Naruto was condensing Chakra.
'Then this was probably this idiot's Inner World.'
'But... what was the source?'
Sasuke stood up and followed the trail of the aura emanating, walking along the path.
He soon reached the end.
A towering, massive red barred gate blocked the way. Behind the gate was pitch darkness, seemingly inhabited by something.
Heavy breathing and undisguised malice continuously seeped through the gaps in the door.
It seemed this was the source of the energy.
"Hey, brat." Behind the door, the massive crimson creature sensed movement and called out.
Sasuke walked forward towards the sound.
Whoosh!
A giant claw shot out with a gust of wind.
Ding!
It slammed hard against the door. Long claw tips protruded through the gaps, stopping just inches from Sasuke's throat.
"Quite bold, brat. You dare not dodge."
"Hmph."
Sasuke snorted coldly, raising his head. His Sharingan stared at the Kyubi.
"It's just a bit of leaking energy. In the end, you're nothing but a beast locked in a cage."
"What did you say?!" Kyubi instantly flew into a rage, its massive body crashing against the bars.
A dark shadow pressed down. A huge face leaned close to the bars.
It was a fox, with slanted triangular eyes.
When it saw Sasuke's eyes clearly, the hatred in its eyes almost solidified.
It grinned, revealing a mouth full of sharp teeth, "These damned Sharingan again! What else can you Uchiha do besides using these eyes to control others?!"
"Control?"
Sasuke frowned, slightly puzzled.
Kyubi snorted coldly and withdrew its head.
It didn't explain, nor did it want to continue mentioning the Mangekyo Sharingan.
As the strongest Biju, even sealed within someone else, it still had its dignity.
Being controlled was too shameful to talk about...
Looking at the giant beast before him, Sasuke seemed to think of something, "I've heard a rumor since I was little. The Yondaime Hokage saved the village from a demon fox."
His tone was very certain, "So it seems, you are that demon fox."
Kyubi grinned, not at all embarrassed, "So what? You humans only know how to call me that."
Sasuke's heart sank heavily.
'I finally understand why that idiot was looked at with those eyes by the villagers, why he was despised by everyone.'
'Because this demon fox was sealed inside him.'
'But in the village's rumors, he had become the embodiment of the disaster that destroyed the village.'
'How interesting.'
Sasuke's thoughts raced. He suddenly remembered the words the Kyubi had blurted out earlier: 'Besides using these eyes to control others.'
'Control?'
A terrifying idea formed in his mind.
Sasuke looked up, his Sharingan locking tightly onto the Kyubi, "The Kyubi Attack seven years ago. You were controlled by the Sharingan back then, weren't you?"
"Nonsense!"
Kyubi reacted like a cat whose tail had been stepped on, instantly bristling, "I am the strongest Biju in this world! How could I possibly be controlled by a mere human's Dojutsu!"
The more vehemently it denied, the more certain Sasuke became of his guess.
'The Kyubi Attack wasn't a natural disaster, but a man-made calamity.'
'It was someone with the Sharingan who had manipulated everything from behind the scenes.'
'Who could it be?'
"Who was that person?" Sasuke's voice became extremely cold.
'Within the Uchiha Clan, who possessed such powerful Pupil Power to control this demon fox...'
The first figure that surfaced in his mind was that man.
But he quickly dismissed the thought.
'No, the timing didn't match.'
'The Kyubi Attack happened seven years ago. Back then, that man was only five or six years old. Even if he was a genius, it was impossible for him to have the power to control the Kyubi.'
'So, who else besides him?'
'In the village, there was another outsider with the Sharingan, Hatake Kakashi?'
'No, that was even more impossible.'
'Kakashi's eye was transplanted. He couldn't possibly unleash the true power of the Uchiha Clan's bloodline.'
Then, who exactly was it...
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