Chapter 50

"That's because both Giyu and I are 'Pillars' in the Demon Slayer Corps. It's just that I am now old, so the current Water Pillar is Giyu."

There are only the "Twelve Demon Moons" among demons, and naturally, there are also those who can match them among humans. Such beings, in the Demon Slayer Corps, are called 'Pillars.'

The 'Pillars' are the Demon Slayer Corps members with the best natural talent and the strongest abilities.

Among them, some are geniuses who have created their own breathing techniques, while others have honed their breathing techniques to the extreme, even developing new moves.

Currently, there are nine 'Pillars' in the Demon Slayer Corps, and the Giyu Tomioka who previously fought with Yudai is the current Water Pillar among the nine.

In the days that followed, Rengoku Zakuro, who had agreed to Tanjirou's request, basically trained Tanjirou every day.

As for Yudai, since he had ample time, he did not rush to leave but instead watched with great interest as Rengoku Zakuro taught Tanjirou the breathing technique.

Rengoku Zakuro did not at all avoid Yudai, and he openly taught Tanjirou everything, to the point where Yudai felt a bit embarrassed.

After a period of observation, Rengoku Zakuro also discovered that Yudai was completely different from other demons.

Not only could Yudai move in the sunlight, but he could also eat normally like them. Whatever Tanjirou and he ate, Yudai ate the same.

Moreover, he did not feel any impulse when smelling blood and seemed to have no sense of "hunger," as if he were a regular human.

Combining Yudai's situation with what Giyu had told him about Yudai's willingness to protect the Tanjirou siblings, even at the risk of exposing a weakness in front of him, Rengoku Zakuro judged that Yudai was somewhat trustworthy.

So, he did not hesitate to demonstrate his "Water Breathing Technique" in front of Yudai.

In Rengoku Zakuro's view, Yudai might not be unsuitable to become a member of the Demon Slayer Corps.

Indeed, Yudai's identity is special, but so what? According to the Demon Slayer Corps, the First Upper Moon, the strongest of the Twelve Demon Moons, Muzan Kibutsuji, is also quite special.

He was a former Demon Slayer Corps member but became the top general under Muzan Kibutsuji.

So why can't Yudai, who has a demon-like aura, become a member of the Demon Slayer Corps?

Although Yudai has a demon-like aura, Rengoku Zakuro's secret investigation found that many villages had been saved by Yudai.

Although he doesn't know why, the young man in front of him seems to be very determined to slay demons. Since they have a common enemy, they can become friends.

Moreover, even without learning the "Breathing Technique," Yudai could fight on par with Giyu, who is not weak among the nine Pillars.

If he masters the Breathing Technique and becomes a 'Pillar,' wouldn't he have the potential to surpass the strongest 'Rock Pillar' among the Pillars?

So, Rengoku Zakuro is now taking a big risk, openly demonstrating his "Water Breathing Technique" to gain Yudai's trust.

If Yudai were to become an enemy of humans, the consequences would be unimaginable. But if Yudai continues to fight demons as he does now, they would undoubtedly gain a powerful ally.

As for Yudai, he clearly didn't think as much as Rengoku Zakuro. He had not been in this world for long.

Whether it's the "Demon Slayer Corps" or the "demons," he only knew what others had told him. However, from what he could see, the Demon Slayer Corps' actions made him feel more comfortable than the demons.

The so-called Breathing Technique seems to be a breathing method created by a genius in this world. Its effect is to strengthen heart function, allowing the blood to obtain a large amount of oxygen in a short time, thereby enhancing human physical abilities to temporarily match those of demons.

After observing Rengoku Zakuro's "Water Breathing Technique" for a month, Yudai found that the breathing technique was not very suitable for him.

The Breathing Technique can enhance human physical abilities, making them temporarily comparable to demons.

But even without using the Breathing Technique, Yudai's current physical abilities are not something ordinary demons can match.

However, one method can lead to many methods. Since the Demon Slayer Corps could derive new schools from the "Sun Breathing Technique" created by Yoriichi Tsugikuni, there's no reason Yudai can't do the same.

With a foundation in swordsmanship from mastering 'Advanced Sword Techniques,' after learning the breathing method and spending half a year refining it, Yudai also mastered the Breathing Technique.

He named this Breathing Technique "Demon Breathing Technique," and as a skill, it received an A rating from the system, just like 'Wind, Forest, Fire, and Mountain.'

The "Demon Breathing Technique," as the name suggests, is a breathing technique that uses demonic energy, so humans cannot use it.

Yudai's "Demon Breathing Technique" does not have various flashy moves like the First Form, Second Form, etc., but is purely a breathing method.

After observing Rengoku Zakuro's "Water Breathing Technique" for a while, Yudai found that the human breathing technique did not significantly enhance his abilities.

So, after learning the breathing rhythm, Yudai tried to add his own demonic energy, using it to strengthen his meridians and heart in conjunction with the flow of breathing.

At first, Yudai almost died from his bold attempt, as his meridians could not withstand the impact of the demonic energy, causing him to be paralyzed for several days.

Thanks to the terrifying recovery ability of a half-demon, he fully recovered a few days later and attempted it again.

This time, he started with a small amount of demonic energy and, after half a year of effort, finally mastered the key to using the "Demon Breathing Technique."

Others who create their own breathing techniques usually also create some moves to complement them, but Yudai felt that his 'Wind, Forest, Fire, and Mountain' was sufficient, so he did not create any new sword techniques.

So, his "Demon Breathing Technique" only has a breathing method but no moves.

However, Yudai believes that using the "Demon Breathing Technique" to drive 'Wind, Forest, Fire, and Mountain' might already have reached a level beyond A+ if skills were rated, and it might even touch the S level.