Yoru Machi's Self-Created Breathing Technique

Because he stayed within the Demon Slayer Corps, Yoru Machi was able to observe many Demon Slayer Corps members training every day.

Especially since he greatly admired them and owed them a favor, Yoru Machi asked Urokodaki and Rengoku to demonstrate Water Breathing and Flame Breathing for him.

As two of the five fundamental Breathing Techniques, the techniques they displayed gave Yoru Machi even more inspiration.

So-called "Breathing Techniques" were actually a form of combat support.

They were techniques collectively known as "Total Concentration Breathing," used to strengthen the body in order to fight demons whose physical abilities far surpassed those of humans.

The principle was to enhance cardiopulmonary function, allowing the blood to absorb a great deal of oxygen in a short period, dramatically increasing one's physical abilities in an instant and temporarily granting stamina comparable to a demon's.

A higher realm of Total Concentration Breathing was "Permanent Total Concentration," in which one could maintain complete focus and control over their breathing even while asleep.

The differing rhythms and methods of each Breathing Technique formed various schools, along with all sorts of moves that worked in tandem with breathing.

Yoru Machi was a master swordsman, and after grasping the principles behind Breathing Techniques, he quickly reached the beginner level.

What made him different from ordinary people was that people in this world used the large amounts of oxygen generated through breathing to strengthen their heart and lungs and improve their physical abilities.

But Yoru Machi's Breathing Technique relied not on oxygen, but on his unique Reiryoku!

That was right. Although Yoru Machi had discovered that he had changed from a Spirit Body into a physical entity after arriving in this world, there was no doubt that he still possessed Reiryoku.

Since both methods strengthened the heart and lungs, why