The Birth of the True-Illusory Breathing Technique! (Bonus Chapter 15 for the Bookish Little Lurker Alliance Leader)

"My husband, I believe you've already noticed."

After completing a set of swordsmanship movements, Esdeath looked at Imu and smiled.

"Mm."

"Your Ice Breathing can draw upon natural energy to create frost and icy air."

Imu nodded thoughtfully.

As everyone knew,

aside from Yoriichi Tsugikuni's Sun Breathing,

the other Breathing Techniques in the Demon Slayer World produced nothing but illusions with their own sound effects.

Thus, they had received less and less attention over the years, eventually becoming basic techniques for children.

But now, the illusions produced by Esdeath's Breathing Technique had become real.

That changed everything.

"Yes."

"This first happened before we discovered spirit stones."

"You know I have a habit of practicing swordsmanship and meditating every morning. I use Ice Breathing every day."

"Mm, which is why your swordsmanship has improved so noticeably. You're already a Great Swordsman now."

As a swordsman himself, Imu greatly appreciated this quality in her.

The two then continued discussing the matter at hand.

"It seems the increased concentration of natural energy will allow Demon Slayer Breathing Techniques to produce tangible elements in the future."

"Not everyone can do it."

Esdeath looked toward the Ice Storm Knights standing guard in the distance.

"My clansmen all know Ice Breathing, but at first, it only worked sporadically."

"Only after exploring and familiarizing themselves with it did they fully master this Breathing Technique that could unleash real elements."

"I am now certain that only those whose Breathing Techniques have reached a relatively high level can draw upon natural energy."

Demon Slayer Breathing Techniques were divided into "Total Concentration" and "Total Concentration: Constant."

The former required taking a deep breath each time to temporarily enhance one's physical abilities.

The latter turned the rhythm of breathing into an instinct, allowing one to maintain the Breathing Technique state even