In Demon Slayer With Heavenly Insight

Chapter 34: Fire Breathing

"Yeah, yeah! Big brother is great!"

Senjuro was the first to rush to his eldest brother's side, his eyes brimming with adoration.

Kanoe stood frozen in place, her thoughts in turmoil. The demonstration from the Flame Hashira just now had shaken her to her core.

For the first time, she truly understood the vast gap between herself and the Hashira.

Just as despair began to creep into her heart, a steady hand gently rested on her shoulder.

She flinched slightly, staring at the hand in disbelief.

Ren's calm voice reached her ears. "It's okay. I'll teach you."

Her face flushed red, and she lowered her head shyly. "Yes," she murmured in a voice so soft it was almost inaudible.

"How's it going, Mr. Ren? Do you need me to demonstrate it again?"

Kyojuro's voice rang out from a distance. He had already sheathed his blade and was silently waiting for Ren's response.

Ren smiled confidently. "No need, Brother Rengoku. I've already learned it."

As he spoke, he approached the Rengoku brothers with an air of composure.

Kyojuro's brows furrowed slightly. He asked again, uncertainty creeping into his voice, "Are you sure you don't need me to demonstrate it one more time? This move is extremely difficult to master."

Ren's response remained the same, his tone unwavering. "Really, there's no need, Brother Rengoku. I've learned it."

Kyojuro hesitated for a moment, then nodded. He understood that Ren was not someone who spoke lightly. If Ren claimed to have learned it, he likely had.

Meanwhile, Senjuro, hiding behind Kyojuro, muttered in a sour tone:

"No need, huh? 'I've learned it~' … Show-off."

He didn't believe for a second that Ren could master such a complex technique with just one glance.

But in the next moment, Ren proved him wrong.

"Brother Rengoku, may I borrow your sword?" Ren asked, his expression serious.

Kyojuro didn't hesitate. He unsheathed his Nichirin Sword and handed it to Ren without a second thought.

Ren examined the blade carefully. The dusky light of evening reflected off the green steel, which seemed to shimmer with an inner fire. The hilt fit perfectly in his hand, and the flame-shaped design complemented the breath technique beautifully.

It was the perfect weapon for Flame Breathing.

"Flame Breathing, First Form: Shiranui!"

With a flash of crimson light, the sword sliced through the air in a perfect arc.

Ren's movements were flawless. Every swing, every step—his form was impeccable.

Watching him, Kyojuro's eyes widened in disbelief. Ren's mastery of Flame Breathing seemed to rival his own.

But Ren wasn't done.

Taking a deep breath, he activated Full Constant Concentration Breathing.

"This is it!" Kyojuro exclaimed, his voice trembling with awe.

For a moment, he had doubted whether Ren truly understood Constant Breathing. But now, seeing Ren's execution, all doubt vanished.

Ren inhaled rapidly, taking in a vast amount of oxygen. Kyojuro knew that such intense breathing could cause a person's lungs to burst if mishandled.

But Ren's body seemed perfectly adapted. His lungs circulated the oxygen effortlessly, enhancing his strength and agility to new heights.

What kind of breathing technique was this?

Before Kyojuro could ponder further, Ren spoke the next words that left everyone stunned.

"Fire Breathing!"

"First Form: Shiranui!"

Boom!

A sonic boom echoed through the clearing as Ren swung the blade, igniting a real flame that illuminated the darkening sky.

This wasn't the illusionary flame typically associated with breathing techniques.

It was real fire.

The clearing fell silent as everyone stared, dumbfounded.

In the original teachings, the elemental effects of breathing styles were merely visual representations, synthesized by swordsmen to make their attacks more effective.

But Ren had wielded actual flames.

And as he swung the blade, a sudden realization dawned upon him.

[You hone the blade and heat it up through high-frequency vibrations and rapid swings. You combine physics with your willpower and awaken the blade into 'red steel'!]

Before their astonished eyes, the green Nichirin Sword in Ren's hand transformed.

Its color shifted from green to a deep crimson, emitting waves of heat that surpassed even Kyojuro's strongest flames.

The heat struck the faces of everyone present, forcing them to step back instinctively.

"Brother… what was that just now?" Senjuro rubbed his eyes, unsure if he was hallucinating.

But Kyojuro didn't respond. He stood frozen, unable to tear his gaze away from the scene before him.

"Fire Breathing… Real Fire Breathing!"

The words tumbled from his lips in a whisper.

What Ren had used wasn't Flame Breathing. It was something entirely new.

The temperature, speed, and power—it surpassed Flame Breathing in every way.

Even more astonishing was the fluidity of Ren's movements. Fire Breathing was seamless, a perfect union of technique and raw power.

Kyojuro felt a pang of shame.

Why hadn't he, as a member of the Rengoku family, been able to create something like this?

Ren, an outsider, had taken the Rengoku family's teachings and elevated them to an entirely new level.

Kyojuro's hands clenched into fists. For the first time in his life, he felt a flicker of inadequacy.

But as he looked at Ren, his admiration far outweighed his envy.

Ren had not only mastered Flame Breathing in an instant—he had innovated upon it, creating a technique that could redefine the very limits of the Demon Slayer Corps.

Watching from the side, Kanoe smiled quietly. The moonlight bathed her figure, giving her an ethereal beauty.

But her gaze never left Ren.

"Ren always finds a way to surprise me," she thought.

To everyone present, Ren's performance was nothing short of a miracle.

Yet, in his heart, Ren felt unsatisfied.

He let out a quiet sigh.

**

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