"It seems the technique was still constrained by worldly morality, preventing the perfection of this forbidden jutsu," Orochimaru murmured to himself.
Though it was only a hypothesis, he was almost certain that his guess was correct.
After all, he refused to believe that the Second Hokage—Senju Tobirama, a genius capable of creating the Impure World Reincarnation—lacked the ability to refine it further. If Tobirama had wished to perfect it completely, he certainly could have.
The problem, in Orochimaru's view, was not capability.
It was restraint.
Moral restraint.
The technique, as it currently stood, still allowed the reanimated individuals to retain fragments of their will and personality. That flaw made control imperfect. And perfection was what Orochimaru sought above all else.
"Truth," he muttered softly, golden eyes narrowing, "is always misunderstood by the masses. That is why it belongs in the hands of the few."
As he spoke, he began thinking of ways to eliminate this weakness.
How could he suppress the consciousness of the reanimated body entirely? How could he transform the Impure World Reincarnation into a flawless weapon—obedient, unquestioning, absolute?
It did not take him long.
"I could use control talismans… enhanced binding seals attached directly to the brain's chakra pathways," he mused. "If I overwrite their will completely, perhaps even erase their self-awareness…"
His lips curled upward.
Despite having only recently acquired the forbidden technique, he had already begun improving it.
Such was Orochimaru's brilliance.
"Seisui-kun," he whispered softly, "once I perfect this technique… I wonder if you will still cling to your naive ideals."
Several days passed in the blink of an eye.
Seisui had successfully completed his series of introductory lectures on medical ninjutsu for all classes at the Ninja Academy. The response had been overwhelmingly positive.
Now, it was time for the official launch of the Medical Special Training Class.
The announcement alone caused a stir across the Academy.
Students rushed to sign up.
Of course, not all of them were genuinely interested in becoming medical ninja. In truth, many were drawn by Seisui himself. His reputation, appearance, and gentle demeanor had made him one of the most admired figures in Konoha.
When the first session officially began, the largest classroom available was packed to capacity.
Every seat was taken.
Students who arrived late had no choice but to stand in the back.
The room buzzed with excitement.
"I can't believe this many people came," Rin Nohara whispered in surprise. She had arrived early to secure a seat in the front row.
Shizune, seated beside her, nodded eagerly.
"It just shows how much everyone admires Lord Seisui."
Kurenai Yuhi crossed her arms confidently. "Of course they do. Brother Seisui is incredibly capable—and handsome."
The admiration in her tone was obvious.
Obito Uchiha, sitting on Rin's other side, felt a sharp stab of envy.
When would he ever receive this kind of attention?
He glanced at Rin, then puffed out his chest.
"I'll be that popular someday too!"
Rin smiled warmly at him. "That's wonderful, Obito. I'm looking forward to it."
Her encouragement made Obito's heart soar.
He nearly melted on the spot.
"Students, please quiet down."
Seisui's voice was not loud, yet it carried effortlessly across the crowded room.
Instantly, silence fell.
Facing such a large audience, Seisui showed no trace of nervousness. His posture was relaxed, expression gentle yet confident.
"First, thank you all for attending."
He paused briefly.
"However, I must clarify something. The Medical Special Training Class exists to cultivate true medical ninja."
"Medical ninjutsu is significantly more difficult than standard ninjutsu. It requires precision, control, knowledge, and patience."
His eyes swept across the room.
"Not everyone who sits here today will remain until the end."
A faint murmur spread among the students.
"I will conduct regular assessments. Those unsuited for medical ninjutsu will be filtered out."
He smiled gently.
"Of course, I sincerely hope you all succeed."
After allowing the message to settle, he continued.
"This course will meet once per week—every Friday."
"We cannot interfere with the Academy's regular curriculum, so we will hold lessons before the weekend."
"If you have questions during the week, write them down and bring them to class. For this first group, I will personally teach every lesson."
"You may address me as Teacher Seisui."
There were no objections.
Thus, the class officially began.
"Phase One: Foundational Theoretical Knowledge."
"This phase will last three months—twelve lessons in total."
Teaching medical ninjutsu to Academy students presented a challenge. They were not yet full-fledged ninja. Their chakra control was still unstable. Many lacked discipline.
Seisui had therefore divided the curriculum into four structured phases:
Theoretical foundation
Chakra control refinement
Practical application
Clinical simulation
Only those who passed one phase could advance to the next.
As the lecture progressed, some students quickly became overwhelmed.
They understood the individual words Seisui spoke.
But when combined into full medical concepts, the meaning blurred into incomprehension.
Medical terminology.
Chakra circulation theory.
Cellular regeneration principles.
It was far more complex than throwing a fireball.
Obito Uchiha was struggling.
Very badly.
He squirmed in his seat, eyes glazed over.
What was Teacher Seisui even talking about?
But when he glanced sideways—
Rin was listening intently.
Kurenai was taking notes.
Even Shizune's eyes sparkled with concentration.
Obito clenched his fists.
I absolutely cannot give up on the first lesson!
If I quit now, Rin will definitely be disappointed!
He forced himself to focus.
In reality, Rin already knew Obito's academic level. She understood that medical ninjutsu wasn't his strength.
But she was too busy absorbing the lesson to notice his internal battle.
Seisui, meanwhile, observed everything calmly.
He had expected this.
Theoretical learning was dry and demanding.
Even though he simplified the explanations as much as possible, difficulty remained unavoidable.
That was precisely why this phase existed.
If students could not grasp the basics, they had no chance in later stages.
The filtering process was necessary.
After finishing the lecture, Seisui looked up.
"If anyone has questions, please raise your hand."
Rin and Shizune's hands shot up immediately.
"One at a time," Seisui said gently, smiling at Rin. "Let's begin with you."
Rin's cheeks flushed faintly.
Teacher Seisui was truly charming.
She quickly asked her question.
Seisui provided a detailed yet easy-to-understand explanation.
Then it was Shizune's turn.
After answering several more inquiries, Seisui glanced around.
"No further questions?"
The room remained silent.
"Then today's lesson concludes."
The moment class ended, Obito rushed toward Rin.
"Rin! Please help me! There were so many parts I didn't understand!"
He hadn't dared ask questions in front of everyone.
Rin sighed softly.
"Obito… you don't have to take this class just because I am."
But Obito shook his head stubbornly.
"I'm an Uchiha genius! I can totally handle medical ninjutsu!"
Kurenai snorted.
"You? A genius?"
"You're literally the dead last."
Obito turned red.
"W-Whatever! Once I master it, I'll treat all your injuries!"
Kurenai folded her arms. "Pass. I'll stick with Brother Seisui."
That hit hard.
Fortunately, Rin intervened gently.
"It's okay. If Obito wants to learn, I'll help him review. It's good practice for me too."
Obito nearly burst into tears.
Rin is the best person in the world!
Seisui, watching from a distance, couldn't help shaking his head slightly.
Simps truly are incredible.
A week passed.
The second session began.
The classroom was noticeably emptier.
Many students had already withdrawn after realizing the difficulty.
Seisui wasn't surprised.
What surprised him—
Obito was still there.
He glanced at Rin sitting beside him.
Ah.
That explains it.
The power of infatuation was truly astonishing.
Week three.
Week four.
Week five.
With each passing lesson, more seats became empty.
But the group of four remained consistent: Rin, Obito, Kurenai, and Shizune.
Twelve weeks passed in the blink of an eye.
Phase One had reached its conclusion.
After finishing the final lecture, Seisui placed a stack of papers on the desk.
"Please remain seated."
"We will now conduct the Phase One assessment."
A ripple of tension passed through the room.
"Only those who pass will proceed to Phase Two."
He began distributing the papers.
"The exam duration is one hour."
"Use your time wisely."
Silence filled the classroom as the test began.
Rin immediately started writing with confidence.
Shizune followed closely behind.
Kurenai appeared focused.
Obito stared at the first question.
His mind went blank.
Cold sweat formed on his forehead.
What… is this even asking?
He glanced sideways.
Rin was already halfway down the page.
No!
I can't fail!
He clenched his pen and began writing—anything he could remember.
From the podium, Seisui observed quietly.
His gaze lingered briefly on Obito.
He couldn't help smiling faintly.
Being a simp…
really was impressive.
Whether that passion would be enough to carry him forward—
That, however, remained to be seen.
Advance Chapters avilable on patreon (Obito_uchiha)