Being unable to walk under the sun was a weakness Muzan could never escape.
Unlike his original world, there was no Blue Spider Lily in the Naruto world to repair his genetic defect.
━━━━━━━━━━━━━━ [Demonpedia] Blue Spider Lily is an extremely rare and mysterious flower in Demon Slayer.
It was used as an ingredient in an experimental medicine to treated Muzan when he was still human.
Although the medicine saved Muzan from his fatal illness, it also transformed him into the first demon.
However, the treatment was incomplete, leaving Muzan unable to survive in sunlight.
He believed that finding the Blue Spider Lily and completing the medicine would allow him to overcome this weakness.
━━━━━━━━━━━━━━ That meant he had to save himself.
The reason he had devoted himself to studying medicine and refining his chakra control was to become a medical ninja.
“Director Harano has agreed to let you work as a medical assistant.
On one condition, you can’t let it interfere with your classes.
You may only train at the hospital on Saturdays and Sundays.” Kaizen laid out the terms.
He wanted Muzan to grow into a shinobi worthy of the White Fang’s name.
Learning medical ninjutsu was fine, but it couldn’t come at the expense of his regular training.
Otherwise, if his former captain questioned him about it, his position as the Ninja Academy’s principal would be finished.
“So I really can intern there?
That’s good enough for me.” “Muzan…
prepare yourself.” Seeing the anticipation in the boy’s eyes, Kaizen didn’t want to crush his dream.
Still, he couldn’t help giving him a warning.
“The hospital isn’t as wonderful as you imagine.
Medical ninja don’t hold a very high status in Konoha.
If Tsunade-sama hadn’t pushed for it, the village never would have invested so heavily in developing medical ninjutsu.” Muzan already knew that.
Medical ninjutsu had flourished during Tsunade’s time in Konoha.
After the Third Shinobi World War, when Tsunade left the village, progress in the field slowed dramatically.
On top of that, becoming a medical ninja demanded incredibly precise chakra control.
Very few people were willing to devote that much effort when they could instead learn powerful offensive ninjutsu.
Among Konoha’s famous shinobi, only Tsunade could truly be called a medical ninja.
Even then…
She was better known for her monstrous strength and the Strength of a Hundred Seal than for healing.
“Thank you, Kaizen-sensei.” “I believe I’ll raise Konoha’s medical ninjutsu to an entirely new level.” Life settled into a fulfilling routine.
Every Saturday and Sunday, Muzan arrived at the hospital before anyone else.
Unfortunately…
Not a single doctor wanted a child as their assistant.
Had he not been Sakumo’s son, he would’ve been thrown out long ago.
Eventually, Muzan went directly to Director Harano, who reluctantly assigned him to a physician.
“Just stay beside me.” Aoyama Seiten sighed inwardly.
Of all days, the director had handed the White Fang’s son to him.
He couldn’t openly refuse.
At the same time…
He had no interest in babysitting a child.
There was already an operation waiting for him.
Pointing toward a corner of the operating room, he said, “Don’t make a sound while I’m operating.” It seemed Muzan was being underestimated.
Fortunately, Kaizen had warned him beforehand.
Otherwise, he might have mistaken Seiten’s attitude for personal hostility.
As the surgery progressed, beads of sweat formed across Seiten’s forehead.
He carefully stitched the patient’s wound.
Out of habit, he called out, “Prepare another blood bag…” Only after the operation ended did Seiten realize today’s assistant wasn’t his usual one.
Exhausted, he looked down and noticed the bloodstained Muzan standing nearby.
His opinion changed instantly.
“You have an excellent medical foundation.” “You’re more than capable of assisting.” “Stay with me and keep learning.” A qualified medical ninja required far more than medical ninjutsu alone.
They also needed to master countless surgical instruments.
Especially on the battlefield, the standards expected of medical ninja were even harsher.
Nothing tested a person’s abilities better than actual practice.
Although Seiten was only a chunin, his medical skill ranked among the hospital’s finest.
His guidance proved invaluable to Muzan.
The entire morning disappeared in a blur of surgeries.
Besides assisting the doctors, Muzan carefully recorded every observation.
“Whew…” “You did well today, kid.” After washing his hands, Seiten noticed the exhaustion on Muzan’s face.
He handed him some food along with a book.
“Recover your strength.” “This afternoon, start practicing medical ninjutsu.” “These are the hospital’s basic techniques.” “They’re perfectly safe to learn.” Opening the book, Muzan found the hospital’s introductory medical techniques.
The Chakra Scalpel.
The Hemostasis Technique.
In reality, most medical ninja only mastered these basic skills.
Even these demanded extraordinary chakra control.
They also consumed a significant amount of chakra.
A single surgery could last for several hours.
Although Chakra Scalpel used chakra efficiently, very few ordinary shinobi possessed enough reserves to maintain it for that long.
Seiten gave Muzan the afternoon to practice.
Behind the hospital, Muzan had already prepared for this.
Picking up a rabbit, he used chakra to stimulate its natural regenerative abilities.
“No wonder there are so few medical ninja.” The flow of chakra had to be controlled with incredible precision.
Too little…
And the wound would split open again.
Too much…
And rapid regeneration would tear the newly healed tissue apart.
Muzan spent the entire afternoon practicing.
By carefully directing the flow of chakra to accelerate healing, he finally began seeing results.
Everything progressed steadily.
As for solving his genetic defect…
He needed access to Konoha’s medical archives.
Fortunately, the hospital stored an enormous collection of research.
Every lunchtime, Muzan buried himself in books about cells and human biology.
“Tsunade is truly a genius.” The author listed on many of the texts was Tsunade.
Her research focused on stimulating cells to rapidly heal injuries.
While some of her methods could serve as inspiration for repairing Muzan’s genetic defects…
He couldn’t simply follow her path.
“I’d rather not get involved with that slippery snake.” When it came to genetic research, no one in Konoha surpassed Orochimaru.
But considering Orochimaru’s personality…
And Muzan’s own unusual cells…
He had a feeling Orochimaru would develop an unhealthy interest in him.
Just as Muzan was debating whether approaching Orochimaru would be wise, the hospital door burst open.
“Muzan, hurry!” “We’ve got an emergency surgery.
I need your help!” Seiten grabbed him without another word and rushed into the operating room.
Only then did Muzan see the horrifying scene.
A large number of injured shinobi filled the room.
Several were already on the brink of death while doctors desperately fought to save them.
Every physician in the hospital had been called in.
“What happened?” “Why are there so many casualties all at once?” “You’ve never experienced war.” “You don’t understand how terrifying it is.” “This squad was ambushed by Sunagakure shinobi during a mission.” “They barely made it back alive.” Seiten offered no further explanation.
He immediately threw himself back into surgery, pulling Muzan along with him.
Several hours later…
Most of the doctors had reached their limits.
Fresh teams had to rotate in to continue treating the wounded.
Seiten suddenly stumbled and collapsed onto the floor.
Only then did he realize…
His chakra had completely run dry.
“I can’t keep going…” “There are still so many patients waiting…” “Damn it!” As he cursed his lack of chakra…
Muzan stepped forward without hesitation.
“I’ll do it.” “I’ve already learned medical ninjutsu.” CREATORS’ THOUGHTS Hidden_Quill Thank you so much for reading!