"Senior..." On the way, the C-rank member, Hattori Heiji, asked in a low voice, a hesitant look on his face.
"About my injury, can we... keep it a secret?"
After he finished speaking, he hung his head, embarrassed. If this got out, he'd probably be laughed at by his Demon Slayer Corps colleagues for the rest of his life, becoming a daily joke.
For him, it would be a majorly embarrassing moment... "Huh?! What did you say?" Uchiha Nagi looked up, giving Hattori Heiji a dead fish eye, a bewildered expression on his face.
"Ah, it's nothing, nothing. It's best if you don't remember, hahahaha. Yes, yes, it's nothing at all," Heiji said happily.
This mission was considered quite successful, even though one person was sacrificed.
He was currently observing some of the history of this world. Although it wasn't as advanced as the Ninja World, many miraculous things had appeared here.
For example, Muzan was a sickly human from birth into adulthood, and the doctor who treated him somehow acquired a miraculous medicine that directly altered his constitution, turning him into a healthy human.
Unfortunately, this medicine had a side effect: he couldn't be exposed to sunlight. Muzan, who had long suffered from illness, had already lost all human gratitude. After he discovered he couldn't eat human food, but could grow stronger by eating humans, he completely succumbed to depravity, even harming the doctor who had cured him.
However, although this world lacked Chakra, it did possess extraordinary powers like fighting aura and swordsmanship.
When Muzan began creating subordinates in his quest to find a way to overcome sunlight, many Martial Artists and swordsmen with righteous hearts and extraordinary powers began to hunt down these man-eating demons.
But later, why did they all gradually disappear, leaving only swordsmen who could use Breathing Techniques, which is to say, the Demon Slayer Corps? The answer is easy to deduce.
Because Martial Artists had no advantage against the immortal and indestructible demons; even if they destroyed their brains and hearts, the demons could still fight, and the same went for swordsmen.
Later, perhaps a swordsman whose nichirin blade was forged from sun ore discovered that severing a demon's neck with such an ore could destroy them.
Thus, a second method of killing them, besides sunlight, emerged. Gradually, various Martial Artists declined, replaced by swordsmen wielding nichirin blades. Then, by a historical accident, Yoriichi Tsugikuni, who was born with Transparent World, created the strongest Sun Breathing.
He then taught Sun Breathing to all demon-hunting swordsmen, but Sun Breathing was too demanding for people, so gradually, some highly intelligent swordsmen created various schools of Breathing Techniques.
What Uchiha Nagi was currently reading about were the legends of some sects that existed before the advent of Breathing Techniques. The reason he could copy Akaza's skills was that Akaza used human martial arts.
The difference was that without a powerful physique and strong regenerative abilities, forcibly using the later forms would have side effects similar to Lee opening four gates from the start...
Even so, Uchiha Nagi was still very fond of the martial arts of this world. Combining the strengths of a hundred schools could lead to enlightenment.
Of course, during this period, even firearms had appeared, and those Martial Artists had become even more obscure and disappeared. Uchiha Nagi looked on, interested in some of the history of this world.
For example, a demonic blade called Mannganmaru once appeared in this world. Its wielder could make three wishes, all of which could only be used for combat, guaranteeing victory in a hundred battles. After the three wishes, the wisher of the demonic blade would suffer a backlash and die a terrible death.
Also, before Muzan appeared, the Martial Artists here flourished, with a hundred schools contending. Among them was a forbidden technique called "Stairway to the Other Shore ~ Flying Dragon Ascends to Heaven."
This was a combat technique that utilized the opponent's momentum, guided by the Five Elements and Eight Trigrams steps, to create a tornado-like attack to defeat the opponent. What was even more powerful was that it was created for the battlefield; the more people, the stronger the killing intent, the greater the momentum, and the more terrifying the destructive power. There was also a technique similar to Super Strength Fist, called "Explosive Acupoint Strike," where one finger gathered the body's energy and released it, capable of blowing up mountains and shattering rocks.
"Interesting, if I can find these things, then it's truly interesting," Uchiha Nagi said with keen interest, looking at the book, which he had brought from Ubuyashiki.
So everything recorded in it was true, but it had all been lost. Not to mention these, even Sun Breathing had been lost by the Ubuyashiki family.
Uchiha Nagi's lips curved slightly upward. It didn't matter if it was lost, as long as he knew who it was, because there was a technique in the Ninja World called Edo Tensei.
Did the Second Hokage really invent thousands of forbidden techniques? With his wisdom, wouldn't he have made deals with and learned forbidden techniques from the powerful deceased he resurrected?
So, Uchiha Nagi had already made up his mind. When he returned to the Ninja World, the first thing he would get his hands on was Edo Tensei, then resurrect the founder of Sun Breathing from Demon Slayer, learn everything from him, and then learn from others.
During the Ninja World Wars, if he resurrected those strong individuals, they would be suspicious and wouldn't teach him forbidden techniques. It was better to find people from this world. However, how to get the improved 2.0 version of Edo Tensei from Orochimaru, and later Yakushi Kabuto's 3.0 version, was a challenge.
That poisonous snake, Orochimaru, wasn't so easy to deal with. It was common to be double-crossed, just like the Fourth Kazekage.
"Um, I'm going to train with Mr. Himejima Gyomei. Do you want to come along?" Uchiha Nagi asked.
"Oh, really, Senior? That would be great! I'd be so grateful if I could come along," the C-rank extra, Hattori Heiji, said with delight.
Then let's go together~
Upon returning to the Butterfly Mansion, he learned that after a period of special training with Uchiha Nagi, Inosuke and his two teammates had formed a squad and gone on a mission with Tanjiro.
Uchiha Nagi directly explained the situation to Ubuyashiki, and Ubuyashiki had also written to Mr. Himejima Gyomei, who agreed.
"Oh? Nagi-kun, it's so good that you returned safely," Shinobu Kocho said, her face filled with joy when she saw Uchiha Nagi.
"Yes, it was a guy with a peculiar ability, but not very strong, so it was easily resolved," Uchiha Nagi smiled and nodded.
"I plan to train with Mr. Himejima Gyomei for half a month to a month, and then I'll return to my hometown to handle some matters."
"Is that so? Please wait a moment, I'll get you some medicine for your injuries," Shinobu Kocho said, then disappeared with a whoosh. When she reappeared, she was holding a small package.
"Thank you, Miss Shinobu," Uchiha Nagi accepted it with a slight smile, not being overly polite.
"Hmm, I wish you smooth training. Oh, and I should thank you too. I think I'm starting to get a grasp on Chakra; I've found a hint of a feeling these past few days," Shinobu Kocho said with a smile.
"Hmm..." Uchiha Nagi nodded, unsure what to say next. After a moment of thought, he finally came up with a sentence.
"Keep it up. I'll be going now..."
"Hehe..." After Uchiha Nagi left, Shinobu Kocho covered her mouth and chuckled.
After bidding farewell to Shinobu Kocho at the Butterfly Mansion, Uchiha Nagi headed to Mr. Himejima Gyomei's training grounds, which were in a large mountain with a waterfall.