"The Buddha said: Life has three great sufferings—Resentment and Hatred Meet, Love and Separation, and Unattainable Desires. Mr. Uchiha Nagi, only by seeing through and letting go can one find liberation. I believe Miss Kagome's spirit in heaven would not wish for you to grieve excessively for her."
In the basement, Tamayo was bandaging everyone's wounds. Looking at Uchiha Nagi, who remained as cold as ice, she couldn't help but offer some words of comfort.
Uchiha Nagi calmly replied, "I am not overly grieved. I only knew her for a few days..."
Tanjiro, at the side, thought to himself, Such a sorrowful melody, and he says he's not grieved? Besides, I clearly smelled it. He can fool others, but he can't fool me~ This was Tanjiro's special ability: a sense of smell that could detect body odors and even emotions. He could perceive a person's seven emotions and six desires, their joys, angers, sorrows, and happiness, all through his sense of smell.
"Mr. Uchiha Nagi, how do you know Water Breathing? Are you also a member of the Demon Slayer Corps?" He couldn't help but be curious, because in the final blow that defeated Susamaru, Uchiha Nagi had used his Water Breathing. Tamayo and her attendant, Yushiro, were also curious. As for Nezuko, she had wandered around for a bit, felt bored, and had already fallen asleep.
"I am not a member of the Demon Slayer Corps. As for why I know Water Breathing, I learned it from you~"
"Learned it from me?!" Tanjiro was completely bewildered. You learned it just by watching once? The Breathing Style I painstakingly mastered over two years, you bloody learned it by watching once?!
Ignoring the petrified Tanjiro, Uchiha Nagi turned to Tamayo. "Doctor Tamayo, I'd like to begin the surgery as soon as possible. Do you have anything scheduled for today? If not, how about we rest this morning and start this afternoon?"
"Oh, oh, are you ready on your end? I'm available anytime. A demon's stamina and recovery are very strong, and I barely participated in last night's battle. You, on the other hand, went through such an intense fight. Do you need to rest for a day before we proceed?" Tamayo asked.
"Then let's do it this afternoon. A morning's rest will be sufficient." Uchiha Nagi nodded at Tamayo. "I'll also have to trouble you to prepare a room for me. I'll rest for a few hours, and we'll begin the surgery this afternoon."
"Very well. Yushiro, please take Mr. Uchiha Nagi to rest."
"Yes, Lady Tamayo~" Yushiro, with an infatuated look, immediately stood up. He didn't want to delay a single moment, eager to escort Nagi to his room and return to Tamayo's side at once.
After thanking them, Uchiha Nagi followed Yushiro down the corridor. The reason he was in such a hurry was because he felt a sense of crisis again. According to Tamayo, those two demons were not among the Twelve Kizuki. But in Uchiha Nagi's view, even unranked cannon fodder possessed Jonin-level strength. Wouldn't the Twelve Kizuki be even stronger?
Based on his combat experience from last night, the demons in the Demon Slayer world, with their immortal bodies, were each comparable to a Chunin in strength. Without a Nichirin Blade, no Chunin could win against them one-on-one—this referred to ordinary Chunin, not the Konoha 12... Then, the two demons from last night, Yahaba and Susamaru, already had Jonin-level strength. Without a Nichirin Blade and lacking intelligence on them, even a Jonin would be helpless against them. For no other reason than their immortal bodies being too overpowered.
As long as one is human, combat leads to fatigue, muscles will ache, and chakra will be depleted. The more intense the battle, the faster strength is lost. But demons don't— This meant that even if one was significantly stronger than a demon, if drawn into a prolonged battle, they would eventually be defeated due to exhaustion. Only by overwhelmingly crushing them and severing their necks with a Nichirin Blade in one go, preventing recovery, could victory be achieved.
Fortunately, according to Tamayo, the fact that they were the "strongest Twelve Kizuki" also implied their numbers were extremely scarce. However, Uchiha Nagi wouldn't entrust his life to the chance that his enemies wouldn't discover him. Last night, he learned that in the eyes of demons, he was the so-called "finest quality of rare blood," like the flesh of Tang Sanzang...
This wasn't surprising—Uchiha blood.
Therefore, Uchiha Nagi decided to expedite the process. The experimental data from the past few days already indicated that there should be no rejection reaction after transplanting the White Zetsu arm. Uchiha Nagi guessed that this arm, because Obito had already assimilated it for a long time, had long since resolved any rejection issues. Transplanting this White Zetsu arm that Obito had used should pose no problem.
After the transplant, he wouldn't have to worry about his Mangekyo's dojutsu power being overused and causing blindness. This way, he could improve his strength without any scruples. Unlike the Uchiha brothers Itachi and Sasuke, or Obito, Uchiha Nagi's Mangekyo abilities were not geared towards direct combat; both were auxiliary types. However, they were auxiliary abilities of a heaven-defying level. Just let him see a Breathing Style once—
Thinking of this, Uchiha Nagi's heart burned with excitement. What would happen if he copied all the Breathing Styles in this world? Quantity over quality—Uchiha Nagi knew many ninjutsu, but he was akin to a certain "Professor" Hokage, a jack of all trades, master of none. This was his greatest frustration. Because he didn't have a strong expert as a teacher~ Reality was different from novels. Even the most genius protagonists had teachers guiding them. And having a suitable teacher's guidance was worth several times one's own efforts. For example, Kakashi, as Naruto and Sasuke's teacher, didn't contribute that much to their strength improvement. Later, when Naruto found Jiraiya and Sasuke found Orochimaru, their strengths began to skyrocket. This showed how much a suitable teacher could help a person.
Soon, after half a day's rest, Uchiha Nagi recovered his stamina. His chakra had also been replenished earlier after taking a soldier pill. He arrived at Tamayo's operating room and nodded at her. Preparations were quickly completed, and the two of them entered a clean room. Uchiha Nagi opened his storage scroll, and a white arm materialized before them. "Doctor Tamayo, performing surgery on myself with one hand is very inconvenient. So, I'll have to trouble you."
Uchiha Nagi then created a Shadow Clone. This Shadow Clone was to be his primary surgeon, and with Tamayo, a doctor who had lived for several hundred years, assisting from the side, there would surely be no problem.
"I understand. I am also very familiar with human anatomy. Please rest assured," Tamayo said with a smile and a nod. Subsequently, Uchiha Nagi, with one hand, activated the Mystical Palm Technique. A green chakra scalpel lit up, and he began to cut open the already healed wound. Throughout the entire process, Uchiha Nagi didn't use any anesthesia, merely biting down on a towel.
Tamayo, throughout the procedure, followed Uchiha Nagi's instructions, helping to connect nerves and blood vessels, then aligning the bones on both sides. Because Uchiha Nagi firmly believed in the efficacy of the First Hokage's cells, no steel pins were used to fix the connected bones. Instead, surgical catgut sutures were used to stitch and secure them. Finally, after all the muscles and blood vessels were connected, the Shadow Clone began to use the Mystical Palm Technique's chakra to repair the cellular tissue.
Before long, the white arm and Uchiha Nagi's severed limb were mostly healed. Not a single wound was visible on the surface, only a scar remained. Afterward, Tamayo took a splint for immobilization and helped Uchiha Nagi secure his arm to prevent the bones from colliding and fracturing.
"Truly incredible. This medical technique you call the Mystical Palm Technique can actually allow muscles and skin to heal in such a short time," Tamayo marveled. "It seems I was hardly any help to you at all. I'm quite ashamed."