They won the Holy Grail War, but this turned out to be the Virtual Tree Universe.

Chapter 15 Breathing Techniques = A Magic Extraction Method That Doesn't Require Magic Circuits

From Urokodaki Sakonji's perspective, Dan Lei, who possesses the martial arts skills of a Celestial Realm expert, is not learning them but instead comes to learn breathing techniques from him. It's like abandoning the gold mine right under his feet to mine copper in his deep mountains and forests. Even the phrase "throwing away the watermelon to pick up a sesame seed" doesn't fully describe this behavior.

It should be noted that Giyu Tomioka explicitly stated in his letter that this Mr. Kojiro Sasaki would most likely only need two sword strikes to defeat him.

After meeting Sasaki Kojiro, Urokodaki Sakonji said that if it were him, he probably wouldn't be able to withstand even one sword strike.

Because along the way, Urokodaki Sakonji tried his best but could not find his whereabouts, while Dan Lei would appear next to everyone in an instant just by waving his hand or calling out.

This man can appear during the day, and even casts a shadow in the sun. Although he is a bit quiet, he can still respond normally when Dan Lei speaks to him, so he can't be a ghost.

In Urokodaki Sakon's subconcept, if someone is not a demon, they can only be a living person. He cannot perceive the absolute difference in their spiritual realm because he can do similar things to ordinary people.

However, Danlei wanted to learn the breathing technique not for the sword techniques within, but to personally experience the feeling of cutting through elements with his breath, so as to understand its principles and see if it would be useful to him.

Sasaki Kojiro's Ganryu swordsmanship cannot achieve this, and his Swallow Return sword technique can only be taught to mortals, so it certainly cannot achieve the effect of the Noble Phantasm Dimensional Slash.

So when Dan Lei saw that Urokodaki Sakonji looked confused, he quickly explained...
"Mr. Urokodaki Sakonji, you seem to have misunderstood. I want to learn the breathing technique because I am curious about the techniques that allow ordinary people to unleash elemental attacks."

To be honest, my methods may seem magical, but they require a very high level of talent.

Not to brag, but among hundreds of millions of people, there isn't even one person with my level of elemental adaptability talent.

Therefore, if the underlying principles could be understood to enable ordinary people with low tolerance to use elements, the value would be extremely high.

If Dan Lei said that, Urokodaki Sakonji said he could accept it, and felt more at ease about Dan Lei.

After all, people who are willing to humbly learn from those in lower positions and try to absorb their strengths are humble people, and such people are rarely truly bad.

However, Sakonji Urokodaki did not agree to Danrei's request on the spot. Instead, he stated that the breathing techniques were the property of the Demon Slayer Corps and that he needed permission from above to teach them to outsiders.

Here, Dan Lei knows that breathing techniques are not actually considered Demon Slayer Corps property. As long as they are used to slay demons and not for evil, it won't be a big deal if the trainer teaches them to people outside the Demon Slayer Corps.

Fortunately, Dan Lei, now an immortal being, was very patient, and based on his understanding of the Demon Slayer Corps, he figured they would most likely not refuse, since they would support anything beneficial to slaying demons. Therefore, he responded...
“That makes sense, after all, I am an outsider who came suddenly, and you don’t know anything about me.”

However, please convey my greetings to the leader of your organization in your letter.

At the same time, please convey to your organization's leader that cooperation always begins with contact. You can serve as a pilot project for my cooperation with the Demon Slayer Corps. My investigation of demons cannot be completed in just one or two years; time will tell.

When Urokodaki Sakon saw how reasonable Dan Lei was, his impression of him improved even more, and he said that he would have to clearly explain the pros and cons in his letter.

Urokodaki Sakonji didn't want to offend Dan Lei at all. You see, Dan Lei had a super expert by his side. If Sasaki Kojiro was really a bodyguard, it was unimaginable how noble Dan Lei's status must be to have a bodyguard of this level.

Just as Danlei had expected, the Demon Slayer Corps approved his request to learn the Breathing Techniques with exceptional ease. Tanjiro's injuries from stepping on traps all the way down the mountain hadn't even healed when the letter from the Demon Slayer Corps agreeing to cooperate arrived.

Furthermore, the letter explicitly stated that if Danlei wanted, he could find someone to teach him the five basic breathing techniques.

However, Dan Lei wasn't one to be greedy. The Dragon Clan was most skilled at water manipulation, so Dan Lei decided to first learn Water Breathing and understand its principles before considering learning other breathing techniques. Thus, Dan Lei once again demonstrated his skill, healing Tanjiro, who was covered in wounds and needed several days of rest, in just a few minutes.

To Sakonji Urokodaki, Abundant Life's healing abilities were nothing short of miraculous, bringing the dead back to life and healing flesh and bones. A wound the length of an arm, which had just scabbed over, was completely healed in seconds.

Of course, Dan Lei himself knew that the ability of Abundant Destiny was simply the mutual conversion of life force. The power of destiny could amplify and more efficiently convert life force, so it could quickly recover from injuries and heal any kind of injury.

Of course, the imaginary energy of an abundant destiny path can also replace the consumption of life force, but this is something that a destiny path traveler of Dan Lei's level cannot do.

As the healer, Dan Lei's treatment would deplete the injured person's own life force if he didn't use his own life force or medicine.

Minor injuries are fine; eating more meat or getting more sleep will help them heal. But if you play around like this with serious injuries, you'll feel like you haven't eaten for days even after you've recovered.

Therefore, the longevity blessed by the Abundant Medicine Master is a heretical path. Once one's life exceeds the limit of the blessing, one must plunder other lives to replenish oneself, otherwise one will face the five signs of decay.

Of course, blessings are also divided into different levels, and the Celestial Race of the Immortal Boat is the top-level one. All the people of the bountiful land are envious and drool with envy, because the life of the people of the Immortal Boat seems to be infinite. They can not reach the upper limit of the blessing even after thousands of years. The so-called Demonic Yin Body is more like a transformation of life than death in the eyes of the other people of the bountiful land.

In short, after Tanjiro was resurrected by Danlei and ate a big meal, he could start training that same day.

So Danlei began to receive instruction alongside Tanjiro.

However, Tanjiro needed to continue building his foundation, while Danrui went straight to learning breathing techniques.

It can only be said that the bodies of the Vidyadharas are too strong. They can learn the Danlei Breathing Technique almost instantly, and in less than a week they have learned to create water streams simply by breathing.

At this moment, Danlei also confirmed the truth about the breathing technique: a magic extraction method that does not require magic circuits.

Yes, the essence remains the same: the elements released by breathing techniques also need to rely on magic, or rather, a special kind of magic called Qi.

Unlike magicians who absorb magic power from external sources through magic circuits, breathing techniques obtain magic power through the air inhaled.

Those who practice breathing techniques can develop lung capacity far exceeding that of ordinary people, enabling them to inhale large amounts of air in one breath.

The air naturally contains magical particles. Those who have mastered breathing techniques can extract these magical particles from their respiratory tract and lungs, forming a special gaseous magical force that flows directly into the human body's meridians, which are different from magic circuits, much like the internal energy in martial arts novels.

This is the truth behind what the animation says about enhancing blood flow and transferring energy to every cell to boost its vitality.

To be honest, before practicing breathing techniques, Danlei had no idea that there were meridians in each of his blood vessels that specifically circulated energy, and the medical knowledge he received from Xianzhou didn't cover these things either.

When the breathing technique is refined to the point of being able to achieve "full concentration", the energy channels in the blood vessels will appear. They are located at a slightly lower level of the magic circuit, but the two do not conflict at all.

However, breathing techniques obviously do not have the concept of circulating Qi throughout the body. The energy converted into Qi in the meridians is used up and then dissipated into the body naturally, even if it is not used.

However, this can also passively strengthen the body, so completing the training of "Full Concentration and Constant Balance" and being able to freely unleash the elements is a necessary condition for becoming a Pillar.

(End of this chapter)