Inside the Konoha Hospital, in the research lab.
Orochimaru was focused, leaning over a table where an injured carp lay.
His hands were wreathed in a soft, emerald-green glow, carefully hovering over the fish's wound; this was the light of Yang-style chakra.
Influenced by this power, the edges of the previously ragged wound were slowly squirming and knitting together at a speed that defied nature.
This was already the fifteenth day since the conclusion of the C-rank mission where they had cleared out the mountain bandits.
Leveraging the adaptability he had displayed during that mission and his curiosity for the unknown, Orochimaru had taken the opportunity to request that Hiruzen Sarutobi allow him to study medical ninjutsu.
Medical ninjutsu was vastly different from the combat ninjutsu system; even the Third Hokage, known as the Professor of Ninjutsu, only had a superficial understanding of its principles.
Therefore, Hiruzen Sarutobi had introduced him to the Dean of Konoha Hospital...
The man standing to the side, a middle-aged man with a kind face wearing a white coat, who was said to also hail from the Senju clan.
He stared at Orochimaru's technique, his eyes flashing with unconcealable amazement.
He had never seen a genius who could learn medical ninjutsu with such terrifying speed.
One had to understand that, unlike ordinary ninjutsu, the threshold for medical ninjutsu was much higher.
It required not only a profound understanding of biological knowledge such as human anatomy and cellular activity, but also the ability to control chakra with the precision of an embroidery needle.
The theory alone required a massive amount of time to study, and chakra control required both talent and extensive practice; most ninja simply wouldn't waste their time on such things.
Yet, this young boy personally recommended by the Third Hokage had passed all theoretical assessments with astonishing scores in just one week.
Immediately following that, he had spent only another week mastering the basic healing technique that used Yang-style chakra to stimulate cell regeneration, and he was already able to skillfully apply it to living organisms.
As the final wisp of green light merged into the fish's body, the wound vanished completely, leaving only a faint, fresh pink hue where it had been.
"Dean, how was that?"
Orochimaru straightened up, gave his hands a light shake, and turned to look at the Dean to ask.
"Perfect, simply perfect!"
"Orochimaru-kun, you are the most gifted student I have ever seen in the field of medical ninjutsu!
Such precise chakra control, such rapid mastery... it is truly unbelievable!"
The Dean did not hold back his praise; there were already few ninja interested in medical ninjutsu, let alone a genius like Orochimaru.
On the other side, Tsunade stood with her arms crossed, her small face filled with a complex and indescribable expression.
She bit her lower lip, looking at the fish that had recovered as if nothing had happened, then back at the calm-faced Orochimaru, feeling a mix of emotions.
Back when she was learning medical ninjutsu, just reaching the step Orochimaru had just performed had taken her several months, during which she didn't know how many times she had failed or how much experimental material she had wasted.
Yet this guy... had actually done it in a mere two weeks!
Could there really be such a genius in this world?
"Heh~"
Orochimaru caught the expression on Tsunade's face, which was a mixture of unwillingness and frustration, and couldn't help but smile.
He was able to achieve this thanks to the vast amount of biological knowledge provided by Harry Os from the Marvel World.
As for the improvement in his chakra control, that came from the Quiet Meditation and cultivation methods from the Under One Person world.
This was the difference between the two worlds he had mentioned before; the cultivation methods of the Under One Person world were far ahead when it came to training the body and the mind.
"What's wrong, Tsunade? Judging by your expression, you seem troubled?"
Orochimaru walked over to Tsunade's side and lowered his voice to ask quietly.
Tsunade was startled by his sudden proximity, then huffed and turned her head away.
"Actually, I have a special way of learning.
If you want to learn, I can teach you~"
Orochimaru's voice was even softer, like a whisper.
"A special... method?"
Hearing this, Tsunade's heart gave a violent leap.
Countless strange and wild thoughts flashed through her mind; this guy was always so mysterious, what could his "special method" be? Could it be...
She snuck a glance at Orochimaru's calm, golden slit pupils, and her heart rate accelerated for no reason.
In the end, unable to overcome her intense curiosity and competitive spirit, she nodded.
"Dean, regarding the inquiry I made earlier about the laboratory equipment suppliers..."
Seeing Tsunade agree, the smile in Orochimaru's eyes deepened, but he didn't say anything more, turning his attention back to the Dean.
"Oh, that.
I have already contacted several reputable suppliers for you, and I can give you the catalog later.
Orochimaru-kun, your willingness to delve into medical ninjutsu is a great thing for Konoha, and our hospital will support you with everything we have."
"If you need to establish your own independent laboratory, I can also help you contact the best construction team in the village, and I can provide suggestions regarding the site selection."
The smile on the Dean's face grew even warmer; for a genius like Orochimaru who was willing to dedicate himself to the research of medical ninjutsu, he was naturally happy to provide some convenience. He paused, then added.
"However, as you know, the hospital's funding has strict regulations on its use. I'm afraid you will have to resolve the funding for the laboratory construction and equipment procurement yourself..."
The Dean changed the subject, his tone carrying a hint of apology.
"That is already enough, Mr. Dean!
You don't need to worry about the funding; I will find a way myself."
A glimmer of excitement flashed in Orochimaru's eyes as he hurriedly expressed his gratitude.
Providing him with purchasing channels was already enough. As for the money, at worst, he could just have Akagi Shigeru make a comeback.
He now had enough capital to pull off something big...
"That's good. Once you have chosen the location for the laboratory, you can come to me at any time."
The Dean nodded in satisfaction.
Having settled the matter of the laboratory, Orochimaru bid the Dean farewell.
Tsunade followed behind Orochimaru, still pondering the so-called "special learning method."
Soon, the two returned to the residence where Orochimaru was temporarily staying.
Tsunade looked around curiously, her heart filled with anticipation for what magical scrolls or secret training items Orochimaru might bring out.
However, Orochimaru simply walked into the room calmly, and a moment later, he walked out holding a thick stack of papers.
Under Tsunade's bewildered and stunned gaze, Orochimaru placed them in front of her.
Tsunade leaned in to take a look, only to see the header of the top sheet of paper clearly written: <High School (Crossed Out) Biology (Compulsory 1): Molecules and Cells>. Flipping down, there were also Fundamentals of Immunology, Human Anatomy and Physiology, Biochemistry, Principles of Genetics...
"This... what is this...?"
Tsunade was completely dumbfounded, pointing at the mountain of test papers and materials, momentarily at a loss for words.
"This is the special learning method I mentioned..."
Watching her dazed expression, Orochimaru finally couldn't help but chuckle.
The so-called special learning method was the sea-of-questions tactic that every child in another world had experienced, as well as the systematic knowledge system of that world.
He had been confirming one thing at Konoha Hospital these past few days, which was verifying which knowledge could be put to use.
And this was the result he had compiled over these days...
Scientific research was never a matter of working behind closed doors; it required the collision of countless wisdoms and the clash of countless ideas. Only through constant trial, error, and verification could one find the path to the truth.
Therefore, he did not mind spreading this knowledge...