[Uchiha Clan District]
[Training Ground]
"Amaterasu!"
Sasuke gathered his pupil power, and black flames instantly slammed toward Rengoku's face.
Rengoku stood where he was without moving. As his Sharingan spun, pupil power burst forth, and a black Susanoo directly knocked the Amaterasu away.
"Not bad. It's a lot faster now."
Rengoku jumped back and stepped out of the Susanoo. The Amaterasu flames also fell to the ground.
Sasuke stared at the flames and extinguished them.
Rengoku looked at Sasuke and suddenly released Amaterasu as well, sending it straight at Sasuke's face.
Sasuke was startled, but he immediately summoned his purple Susanoo.
Although he was already fast enough, his face still burned with pain.
"When fighting an Uchiha, be careful of any movement where their gaze focuses somewhere. When their gaze locks on and pupil power gathers in their pupils, there will be signs."
"Even if I didn't have Amaterasu, it could be some other eye technique."
"If you wait until the technique is already coming at you before reacting, it may be too late."
"And it's always better to dodge an enemy's eye technique than block it with Susanoo."
"Urgh..."
While Rengoku was lecturing him, Sasuke let out a muffled groan, covered his eyes, and dropped to one knee. His Susanoo also disappeared.
Rengoku walked over and handed him a bottle of water.
"See? The consumption is too much. Take a break."
Breathing heavily, Sasuke took the bottle and gulped down the water.
"Shishou, why does using Susanoo hurt so much?"
The first time Sasuke activated Susanoo, he was covered in injuries and couldn't tell.
Now that he was practicing with it, it really was hard to endure.
"Heh!", Rengoku smiled.
"Every power comes with a price."
"Why do you think the Sharingan is called the cursed eye?"
"Once you awaken the Mangekyo Sharingan, these eyes will force your body to provide energy every time you use them."
"You've never released this much chakra and pupil power at once before. Of course it feels painful."
"You need to train properly and let your body grow stronger quickly. Only then can you handle this burden."
Sasuke covered his eyes and nodded thoughtfully.
Rengoku continued teaching him, "You followed my instructions and aimed Amaterasu directly at the head, but it was too obvious."
"Against ordinary ninja, that brief moment of visual focus isn't enough time for them to escape."
"But if you run into a taijutsu ninja with extreme speed, or someone skilled in space-time ninjutsu, you won't be able to lock onto them."
"High burst power means high consumption. Right now, both your pupil power and chakra are very limited."
"You need to think for yourself about how to use Mangekyo techniques. Don't just throw out an Amaterasu every time you see something."
This time Sasuke had truly learned his lesson. Whatever Rengoku said, he did his best to remember.
After all, there were only a few people with Mangekyo Sharingan. This was all valuable experience.
"Shishou, I feel like my eyes haven't been doing very well lately. My vision is getting worse. Is that normal?"
Since awakening the Mangekyo Sharingan, Sasuke had used it many times.
Now he had already noticed the decline in his eyesight.
The corner of Rengoku's mouth lifted, "Guess why your father wears glasses."
Seeing the surprise on Sasuke's face, Rengoku stopped keeping him in suspense and explained directly, "I already told you. The Sharingan is a cursed eye. After awakening the Mangekyo, as your pupil power declines, your eyesight will keep getting worse."
"The more you use it, the faster you'll go blind."
Hearing Rengoku's words, Sasuke's face turned pale, but he quickly shook his head.
"Shishou, then what about your eyes?"
Rengoku activated his Mangekyo Sharingan.
"Take a close look at my pattern."
Sasuke looked over.
He knew that every Mangekyo pattern was different.
But after staring for a long time, he couldn't see any difference.
"This is the second stage of the Mangekyo. It's called the Eternal Mangekyo Sharingan."
"It means eternal. Pupil power never runs dry."
Sasuke immediately felt a strong longing and asked eagerly, "Then Shishou, how can I obtain the Eternal Mangekyo Sharingan?"
Rengoku patted Sasuke's shoulder, "If it were that easy to obtain the Eternal Mangekyo, Fugaku, Itachi, Shisui, and Makumi would already have it."
"Don't aim too far ahead."
It was true. Sasuke wasn't even fully familiar with the Mangekyo yet. Thinking about that was too distant.
Sasuke looked conflicted, "Then Shishou, how should I use the Mangekyo Sharingan?"
After all, pupil power was limited. He couldn't waste it recklessly. But if he didn't practice, the combat strength he could develop would also be limited.
Rengoku smiled, "You're at the age where your fighting style is taking shape."
"With limited pupil power, whatever method feels most suitable to you is the method that suits you."
Sasuke was actually a ninja who was very good at using his brain in battle.
Before awakening the Mangekyo Sharingan, he planned his fights in great detail.
He would decide in advance when to use thrown ninja tools, when to use genjutsu, and when to use Lightning Release.
His battles flowed smoothly, completely unlike Naruto's approach of throwing out a bunch of shadow clones and charging in with wild punches.
But after obtaining the Mangekyo Sharingan, his mentality swelled. He basically fought using only Susanoo and his eye techniques.
After defeating Danzo, he felt that having the Mangekyo made him unbeatable and began challenging opponents far above his level.
As a result, his own strength was lacking, and Killer B, the Eight-Tails jinchuriki, beat him to the brink of death twice.
If his teammates hadn't risked their lives to save him, Sasuke would have died there.
After receiving Itachi's eyes, the Ninja World War began. At that point, even a passing dog would get hit with an Amaterasu.
Large numbers of White Zetsu were all burned to death by Amaterasu.
Only when he fought Madara and found that Amaterasu was useless, and after descending from the sky only to have Madara wipe out all his momentum with a single strike, did he finally calm down.
After obtaining Yin Power, Sasuke gradually returned to a fighting style centered on taijutsu, with the Sharingan serving as support.
The Sasuke here was different.
The setbacks he experienced when awakening the Mangekyo were enough to extinguish his arrogance.
Even now, after awakening the Mangekyo, he still didn't think he was strong.
At present, Sasuke desperately wanted power. Even Susanoo could not give him a sense of security.
After all, Obito already possessed Dual Kamui. Sasuke had to guard against Kamui attacks and the Kamui Shuriken he might use in the future.
Rengoku's lessons about paying attention to visual focus and pupil power flow were also his way of preparing Sasuke in advance.
"Remember this. In a civil war between Uchiha, if you can dodge an eye technique, never take it head-on."
"Don't neglect your taijutsu and ninjutsu training."
Sasuke knew his master was teaching him how to fight Obito in the future, so he listened carefully.
"Shishou..."
Karin's voice came from outside.
Sasuke pressed a hand to his forehead, feeling somewhat helpless. It seemed he was about to be fed dog food again.
Sure enough, the moment Karin arrived, she leaped forward and threw herself into Rengoku's arms.
Rengoku held Karin affectionately and patted her. The two looked very close.
At this point, Sasuke focused on the tip of his nose and emptied his mind, pretending not to see anything.
Only after the two stopped did he properly greet her.
"Mistress."
Karin turned her head toward Sasuke.
"Oh my, it's already mealtime and you're still not eating. Little Sasuke is really hardworking."
A gloomy look appeared on Sasuke's face. No matter how he heard it, Karin's words sounded strange.
"Alright, it's about time. Sasuke, you need a balance between work and rest too. Go back and eat."
After giving his instructions, Rengoku carried Karin away with him.
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