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It was an equivalent exchange, and Uchiha Nagi didn't feel he was at a disadvantage; rather, he felt he had profited.
The highest cultivation system in this world, Breathing Technique, exchanged for the ordinary Ninjutsu of the Ninja World—he had completely struck it rich, hadn't he?
Moreover, he hadn't even handed over the advanced Ninjutsu yet, such as Eight Gates Release Formation, Chidori, Rasengan, Flying Thunder God... Of course, Uchiha Nagi didn't know any S-rank Ninjutsu, only Eight Gates Release Formation.
For them, there was no disadvantage; Medical Ninjutsu alone was a huge gain. In this world, apart from Breathing Technique, humans didn't possess any supernatural abilities for rapid healing, unless it was a Blood Demon Art.
Although medical techniques were also very advanced, they were similar to the world Uchiha Nagi came from before his transmigration, roughly around the 1900s.
The Demon Slayer Corps had a large support staff because not everyone had the talent to advance to a Hashira. Those who were injured or had lower talent would enter the logistics support.
The Butterfly Mansion was such a place. Although called the Butterfly Mansion, it was about the size of a small manor, surrounded by wisteria flowers of various hybridized species, because they were all poisonous to demons.
Besides that, there were many medicinal herbs for the Demon Slayer Corps members, for both external and internal injuries. Members who used Breathing Technique had bodies much stronger than ordinary people.
As long as they weren't eaten by a demon on the spot, they could generally survive, though some ended up with disabilities... "Oh, moshi moshi, Mr. Uchiha, can your Mystical Palm Technique Ninjutsu reattach severed limbs on the spot? What an incredible jutsu! It's hard to imagine that humans created this themselves."
Inside the Butterfly Mansion, Shinobu Kocho was discussing Medical Ninjutsu with Uchiha Nagi.
"It's not absolute. After a person's hand leaves the body, cells rapidly die due to lack of nutrients. It's best not to exceed 24 hours, and keeping the severed limb at a low temperature is best. If it exceeds 48 hours, even if reattached, the arm might be half-crippled," Uchiha Nagi said.
"I see, but I still don't completely understand Chakra. I tried for several hours this morning, but there was no reaction at all."
"Don't rush. Extracting it within a month is considered normal."
Regarding this, Uchiha Nagi didn't have specific reference values, because children in the Ninja World basically started learning the basic knowledge of Chakra extraction at a few years old, and then succeeded naturally.
Children's comprehension varies, some fast, some slow. It's normal for Chakra to appear after a few months or a year or two. But for adults... Uchiha Nagi truly didn't know anyone who started learning to extract Chakra as an adult, so he could only lie and tell them that extracting Chakra within a month was normal.
"Speaking of which, I'm curious about Mr. Uchiha's background. The place you came from is truly amazing, to have something like Chakra," Shinobu Kocho said.
"I come from another world. Because I was being hunted, I arrived here by chance. I am also shocked by the Breathing Technique of this world," Uchiha Nagi smiled faintly.
"By the way, if you don't mind, just call me Nagi-aniki (Nagi, older brother) like Tanjiro and the others. I seem to be a year or two older than you."
Shinobu Kocho was stunned, not by Uchiha Nagi's words, but by his faint smile; his handsome face directly imprinted itself in her mind.
The Uchiha Clan's looks were always outstanding. Even Obito, who had the lowest looks, was handsome, and Uchiha Nagi was at the top tier of Uchiha looks, like Itachi and Sasuke.
Shinobu Kocho's face instinctively flushed a little, because among the Demon Slayer Corps, Giyu Tomioka was considered quite handsome, but compared to Uchiha Nagi, he was several levels below.
"I'll call you Mr. Nagi. We just met, so calling you 'older brother' feels a bit awkward," Shinobu Kocho said.
"As you wish. I'll give you the books related to Medical Ninjutsu first. If any of the support staff extract Chakra, you can have them read and learn. If they don't understand the books, they can come and ask me."
Uchiha Nagi took out a storage scroll, opened it, and with a 'poof,' after a puff of smoke, a large pile of books appeared.
These were some of the medical documents he carried. They weren't forbidden jutsu and were already memorized, so giving them directly to Shinobu Kocho was no issue.
"What a convenient item! It can even store things. This also requires Chakra to use, right?" Shinobu Kocho looked enviously at the storage scroll. If she had this, she could carry more wisteria toxins in the future.
"Yes, but I don't know if the materials for making storage scrolls can be found here. I'll make a list then, and see if the Demon Slayer Corps can find substitutes," Uchiha Nagi said.
Many storage scrolls were made from the fur of powerful Chakra-infused beasts, or had a portion of it added. Only then did they have powerful storage capabilities, unlike what some people thought, that an ordinary piece of white paper could serve as a storage scroll...
After bidding farewell to Shinobu Kocho, Uchiha Nagi arrived at the infirmary in the Butterfly Mansion. The three little ones were still lying in their sickbeds.
Zenitsu's limbs were significantly shortened because he was poisoned by a spider and almost turned into a spider. He had been detoxified, but it would take a long time to fully recover.
Tanjiro was suffering from the aftereffects of using Sun Breathing, and Xiao Zhuzhu Inosuke (Little Piggy Inosuke) had severe body injuries and fractures.
Unless it was an emergency, Uchiha Nagi didn't plan to use Medical Ninjutsu to quickly heal them. Didn't the Konoha hospital also have a large number of injured? Natural healing actually had better results.
"It's great that you're all fine. Rest and recover. Once your injuries are healed, I'll teach you something," Uchiha Nagi said.
"Uchiha-aniki (Uchiha, older brother)!" "Nagi-aniki (Nagi, older brother)!"
"Oh~ Red-Eyed-aniki (Red-Eyed, older brother)!"
Needless to say, the one who couldn't remember his name was definitely Inosuke.
"Red-Eyed-aniki (Red-Eyed, older brother), what good things are you going to teach us~ Is it Breathing Technique?" Inosuke asked curiously.
"No, it's taijutsu. Your respective Breathing Techniques are already very perfect. What I'm going to teach you is called Eight Gates Release Formation," Uchiha Nagi said.
"Eight Gates Release Formation?!" +3
That's right, Eight Gates Release Formation. The stronger the body, the stronger the opened gate. This jutsu isn't a forbidden jutsu; anyone who understands Medical Ninjutsu can learn it on their own, but the difficulty lies in constantly training one's physical body.
If someone is a weakling, even if they open the seventh gate, they won't become incredibly powerful. But for a strong person, once they open the seventh gate, it's absolutely world-destroying.
Most of the Hashira in the Demon Slayer Corps are already adults. As age increases, bones and meridians gradually set, so even if they train in Eight Gates Release Formation, it would likely be very difficult to reach the eighth gate.
However, for teenagers who are still developing, training in Eight Gates Release Formation is more effective. Uchiha Nagi was also a bit curious if they could use Eight Gates Release Formation while maintaining their Breathing Technique.
Uchiha Nagi wouldn't admit that he just wanted to be a porter...