After some persuasive talk, Su Yu successfully convinced Uchiha Sasuke.
Sasuke became deeply engrossed in unlocking the potential of his Sharingan.
When he learned about the existence of the Mangekyō Sharingan, he was utterly stunned and became eager to obtain this power.
Su Yu didn't merely sell a dream but provided a series of training plans.
With Sasuke's talent, he should be able to achieve it, right?
Well... hopefully!
Holding the Book of Ninjutsu in his hands, Su Yu couldn't help but smile as he began flipping through its pages.
This book encapsulated all of Sasuke's learned ninjutsu, condensed into a single resource.
Thanks to the system's omnipotence, such a feat was possible.
The only pity was that Sasuke's current arsenal of ninjutsu, though diverse, was mostly of average power.
Techniques like space-time ninjutsu or sage arts were still far out of reach.
However, Su Yu wasn't in a hurry.
The trade link had been established; once Sasuke mastered something, Su Yu could trade for it anytime.
For now, these techniques were more than enough to keep him busy for a while.
Out of curiosity, Su Yu decided to test his own potential.
Chakra formation.
Ninjutsu.
Could someone like him, a traveler from another world, actually learn these?
Without hesitation, Su Yu delved into the process.
The Book of Ninjutsu was a manifestation of Sasuke's experience, containing all his insights and understanding.
Buzz...
Su Yu quieted his mind, immersing himself in the book as though he had become Sasuke himself.
Through Sasuke's perspective, he experienced the process of training firsthand.
The first step in becoming a ninja was, of course, learning to mold chakra and understanding its composition.
Chakra, a unique and intangible form of energy, was created by fusing a person's mental and physical energies.
It was the foundation of all ninjutsu!
Using Sasuke's experiential perspective, Su Yu focused on sensing his own body and spirit.
After an indeterminate amount of time, a faint, intangible energy began to form within him!
Su Yu was overjoyed but quickly calmed himself, guiding this energy through his body and into his dantian.
What surprised him, however, was that unlike Sasuke's fire and lightning chakra nature, Su Yu's chakra exhibited a dynamic Yin-Yang balance.
It was the rarest chakra nature—Yin-Yang Chakra!
As the saying goes:
"The Dao gives birth to One, One gives birth to Two, Two gives birth to Three, and Three gives birth to all things."
Yin-Yang chakra possessed innate versatility.
This meant that whenever Su Yu performed ninjutsu, its effects would exceed normal limitations.
"Is this the unique perk of being a transmigrator?" Su Yu mused, becoming even more motivated to train.
The more chakra, the better.
Unlike ordinary individuals, Su Yu's body had been strengthened, making his physical energy exceptionally abundant.
This allowed him to mold a significant amount of chakra right from the start.
In just a few hours, he amassed the equivalent of what Sasuke could achieve in a month of training.
But this progress came at a cost—a profound hunger.
Grrr...
Su Yu's stomach protested loudly, forcing him to stop training and head to the kitchen.
Rummaging through the fridge, he ate everything in sight, cooked or raw, leaving it entirely empty.
Even then, he was only partially full.
In desperation, he recalled the soldier pills from Naruto and promptly asked Sasuke for one.
After consuming the pill, the hunger finally subsided.
"Phew! I almost starved to death. Am I the only transmigrator who's this unlucky?" Su Yu joked to himself with a sigh.
He reminded himself not to overdo it next time. Proper preparation was crucial to avoid overexertion.
Despite this, as he felt the chakra surging within him, Su Yu couldn't help but grin.
It seemed he was a natural talent in ninjutsu after all!
At this rate, by the time Thanos arrived on Earth, he might reach Kage-level strength!
Wait... how many moves could a Kage withstand against Thanos?
... Not even one, huh?
Shrugging off the thought, Su Yu decided to let it go and headed back to his room to rest.
Just as he lay down, his phone buzzed.
He glanced at the caller ID—it was Natasha.
"A call in the middle of the night? It's been a while. Could it be... hunger?"
After ending the call, Su Yu quietly left the house.
Sure enough, Natasha was waiting outside.
"Long time no see, Natasha..." Su Yu began, ready to greet her.
But before he could finish, Natasha lunged at him, executing a grappling move that pinned him down.
Like a mountain crashing down, Su Yu was left dizzy and disoriented.
He had no idea what happened after that.
Time flew by, and dawn was breaking.
Su Yu held the beautiful woman in his arms, teasing her:
"Just a few days apart, and you were that hungry? Satisfied now?"
"Hehe, I'm full," Natasha replied lazily, snuggling into his chest.
Though reluctant, she eventually got up to get dressed.
Su Yu frowned slightly, pulling her back.
"Rest a bit more. Leave later."
"Are you sure?" Natasha asked with a sly smile, her tone teasing.
"If you don't mind being caught by her, I'll stay. Doesn't bother me."
With that, she made to lie back down.
But Su Yu wouldn't indulge her antics. A swift tap on her head had her crying out melodiously.
"Speak properly!" he said, maintaining a calm demeanor.
"Don't be so cold!" Natasha pouted, planting a kiss on him as an apology.
Finally, she explained:
"You know my job. This mission might keep me away for a while. I'll miss you..."