Fox Demon: Heaven rewards diligence; I will eventually achieve divine mastery of martial arts.

The boy had long black hair and a blank expression, seemingly lost in thought.

However, the clothes he wore were those of a Pillar-level being, namely the Mist Pillar—Muichiro Tokito.

"Tanjiro, now that most of the people have left, you can say you want to stay and talk to me about what's on your mind."

Kagaya Ubuyashiki asked.

He looked at Tanjiro Kamado with great interest. Although he already had a plan in mind and knew a little about Tanjiro Kamado, after actually meeting him, he found that the other man was still somewhat unfathomable.

From the moment the other party entered this place, they did not show any signs of stage fright. It seemed that facing so many people in front of them was a very normal thing for them.

“I would like to examine Mr. Ubuyashiki’s body. Your current symptoms seem to be similar to those in an ancient book I consulted before.”

Kamado Tanjiro said.

His staying here was, of course, Lin Yu's instruction.

Although he didn't know why Lin Yu was interested in Kagaya Ubuyashiki's illness, he now trusted Lin Yu completely.

"inappropriate!"

No sooner had he finished speaking than Himejima Gyoumei spoke up to stop him.

After all, Tanjiro Kamado is extremely strong. If he were to come into close contact with Kagaya Ubuyashiki, and if Tanjiro Kamado harbored even the slightest ill intent, he would be able to harm Kagaya Ubuyashiki before they could even react.

Having witnessed the battles between Tanjiro Kamado and Sanemi Shinazugawa, Gyomei Himejima was extremely wary of the boy before him.

Putting aside for now Tanjiro Kamado's statement that he only used 30% of his power.

Just considering the punch that Kamado Tanjiro delivered, Gyomei Himejima felt he couldn't do it.

"It's alright. This illness of mine is quite old. I've consulted many doctors, but none of them have been able to find a solution. If you, Tanjiro, could offer some guidance, that would be great."

Kagaya Ubuyashiki stopped him.

He had no idea that Tanjiro Kamado had called him over for this very reason.

When news of Tanjiro Kamado reached him, he investigated Tanjiro Kamado's information through the Demon Slayer Corps' intelligence network.

He investigated everything from her background and upbringing to the people she knew.

But whether in Kamado Tanjiro's hometown or with Urokodaki Sakonji, Kamado Tanjiro should not have had the opportunity to come into contact with ancient books.

Now, Tanjiro Kamado says he saw it in an old book...

It could be a coincidence, but Kagaya Ubuyashiki felt more that the other party was probably coming for him.

After all, Tanjiro Kamado seems to have many secrets.

If you analyze the information you get from Giyu Tomioka and Sakonji Urokodaki carefully, you can easily draw a conclusion.

Two years ago, Tanjiro Kamado was just an ordinary boy, but after arriving at Mount Sagiri, Sakonji Urokodaki said that he was a martial arts genius, one in a million.

The severity of this sense of disconnect all points to one outcome.

That is, Tanjiro Kamado got an opportunity within two months.

An opportunity that could turn an ordinary person into a powerful one in two months.

Kagaya Ubuyashiki never intended for Tanjiro Kamado to relinquish this opportunity.

Aside from the fact that Tanjiro Kamado is so powerful that the Demon Slayer Corps might not get this opportunity, making a powerful friend is far more worthwhile than having another powerful enemy.

Although the Demon Slayer Corps is strong now, the activities of demons are becoming increasingly brazen and frequent.

Even with nine Pillar-level swordsmen, the manpower was still insufficient, not to mention that everyone faced the risk of disability, injury, or even death every time they went on a mission.

Therefore, Tanjiro Kamado's arrival was a timely help.

What this opportunity is is no longer important.

As for the ancient books that Tanjiro Kamado mentioned, Kagaya Ubuyashiki had absolutely no expectations.

After all, his illness was a curse, a curse originating from Muzan Kibutsuji. As far as he knew, there should be no other family in the world with such a curse.

So he became even more curious about why Tanjiro Kamado was saying these things to get closer to him.

Tanjiro Kamado, however, remained expressionless. After hearing Kagaya Ubuyashiki's words, he replied:

"Please extend your hand, Mr. Ubuyashiki."

Kagaya Ubuyashiki nodded and extended one of his arms.

He was wearing a plain-colored kimono, but the fabric was luxurious, and beneath it was a pale arm, sickly pale.

Guided by Lin Yu's voice in his mind, Tanjiro Kamado placed his index finger on Kagaya Ubuyashiki's wrist pulse.

He naturally didn't know how to treat a patient, but Lin Yu in his mind said he would come on his own, so Kamado Tanjiro wasn't worried at all.

Meanwhile, Gyomei Himejima watched the two of them nervously. He looked at Tanjiro Kamado's actions with a strange expression in his eyes, after all, he had never seen such a bizarre way of treating patients before.

In the distance, Muichiro Tokito, who was lost in thought, seemed to have sensed something, and a glimmer of light appeared in his lifeless eyes.

Among them, the most surprised was Kagaya Ubuyashiki.

Tanjiro Kamado had read some of the medical information in the Ubuyashiki family's collection of books because of the way Tanjiro Kamado treated patients.

That originated from a vast ancient kingdom across the coast.

Could it be that Tanjiro Kamado's change in strength was also due to receiving the inheritance of an ancient country?

Kagaya Ubuyashiki, who had been completely unconcerned, began to stir a little more.

After all, the Ubuyashiki family had been searching for ways to cure the curse within their own country, but perhaps the ancient country might have a solution.

Kagaya Ubuyashiki, who had just had this thought, suddenly felt a little dazed, his eyes glazed over for a moment, and then returned to normal.

The others were completely unaware of the strangeness that Ubuyashiki Kagaya experienced, since that momentary daze only lasted for a fleeting moment.

This dazed feeling was naturally caused by Lin Yu entering Ubuyashiki Kagaya's room.

At this moment, Lin Yu was tracing the source of the emotional energy he had sensed with his spiritual power.

It rushed straight from Ubuyashiki Kagaya's palm to the opponent's brain.

When Lin Yu arrived at Ubuyashiki Kagaya's brain, a hint of surprise appeared in his eyes.

Because he saw a magical scene.

That is, in the brain of Kagaya Ubuyashiki, there is a "worm".

This worm is not a worm in the physiological sense, but rather a "worm" made of blood.

The insect didn't make many movements; it merely pressed down on Kagaya Ubuyashiki's brain.

Lin Yu naturally understood Kagaya Ubuyashiki's condition from the original work. The curse on the other party was not actively imposed by Muzan Kibutsuji, but was a curse that naturally arose after Muzan Kibutsuji turned into a demon.

Lin Yu observed the insect and was certain that the source of the emotional energy came from the other party. He also noticed that the insect was obviously in a dormant state, but if the insect moved, it would definitely cause irreversible damage to Ubuyashiki Kagaya's brain.

Lin Yu pondered for a moment, then transmitted his thoughts to Tanjiro Kamado.

Tanjiro Kamado also quickly spoke up:

"Mr. Ubuyashiki may experience some tingling in his head in a moment, so please be prepared."

"Why is there a stinging sensation?"

Kagaya Ubuyashiki was taken aback; he hadn't expected Tanjiro Kamado to actually have some tricks up his sleeve.

Beiming Island Xingming also stopped what he was doing and listened carefully.

He was extremely grateful to Kagaya Ubuyashiki for saving him back then, and he was heartbroken by Kagaya Ubuyashiki's worsening condition.

However, he had also heard that the Ubuyashiki family had spent countless resources trying to cure the disease without success, so he was naturally powerless to help.

How could he not be shocked that Tanjiro Kamado was able to react even slightly?

Tanjiro Kamado hesitated for a moment, but he was actually communicating with Lin Yu in his heart. He quickly received an answer from Lin Yu and immediately relayed it to everyone:

"Mr. Ubuyashiki must have seen many doctors, right?"

"It's natural."

Kagaya Ubuyashiki nodded.

"But in fact, none of these doctors have been able to find the cause of the disease because the disease has been hidden. So some small methods are needed to stimulate the disease and make the cause appear. Rest assured, this will not cause any harm to Mr. Ubuyashiki."

Tanjiro Kamado pretended to say, "These were all taught by Lin Yu."

The latter half naturally calmed down Himejima Gyomei and Tokito Muichiro, while Ubuyashiki Kagaya pondered for a moment before saying:

"Tanjiro, please do as you please. My body is already broken and dilapidated. I don't ask for healing, but I beg you to help heal my young son."

"Whether this disease can be cured is still unknown, even after examining the cause."

Tanjiro Kamado quickly replied.

"Even just the cause of the illness is fine."

Kagaya Ubuyashiki didn't care at all.

Even though he usually appears very calm, he couldn't help but feel a little excited at this moment. After all, this disease had always been a source of anxiety for the Ubuyashiki family, as they had been told their death date because of it since birth.

What could be more terrifying than waiting to die?

The source of Kagaya Ubuyashiki's hatred for Muzan Kibutsuji lies in the death caused by the latter's curse. If this curse could be cured, it would be a way of giving an account to their ancestors.

"Alright, please get ready."