As thoughts swirled in Ryuya's mind, Tanjiro had already begun performing the Hinokami Kagura.
Clad in ceremonial attire, Tanjiro raised his blade-like instrument and swung it in a powerful arc.
Ryuya's eyes sharpened.
Almost instinctively, he murmured under his breath.
"Sun Breathing, First Form: Dance."
The movement was fierce yet controlled.
Tanjiro's weapon swept upward.
Though no visible flames appeared, the surrounding air grew noticeably hotter.
"Sun Breathing, Second Form: Clear Blue Sky."
"Sun Breathing, Third Form: Raging Sun."
"Sun Breathing, Fourth Form: Fake Rainbow."
"Sun Breathing, Fifth Form: Fire Wheel."
Each motion flowed seamlessly into the next.
The Hinokami Kagura was not merely a ritual.
It was Sun Breathing.
Tanjiro moved quickly, but to Ryuya—
Time slowed.
Through the Transparent World, every muscle contraction, every breath, every subtle shift in weight became clear.
He was not merely watching.
He was memorizing.
Even after a single performance, Ryuya had already grasped seventy to eighty percent of the forms.
Still—
He suppressed the urge to test them immediately.
Now was not the time.
Interrupting the ritual would be disrespectful.
And unless he understood every beat without flaw, he would not attempt Sun Breathing recklessly.
Tanjiro's breath grew heavier in the freezing night air.
Snow continued to fall.
Yet his movements did not falter.
Clean.
Sharp.
Unbroken.
Ryuya narrowed his eyes.
Breathing Technique.
Even without formal training in the Demon Slayer Corps, Tanjiro had already begun walking that path unknowingly.
Makomo noticed her master's unusual intensity.
She had heard him muttering something about Sun Breathing.
Her master used Moon Breathing.
Sun and Moon…
She had never heard him mention this before.
It sounded powerful.
Mysterious.
But seeing how focused he was, she swallowed her questions.
Fine.
She would interrogate him later tonight.
"Sun Breathing, Sixth Form: Burning Bones, Summer Sun."
"Sun Breathing, Seventh Form: Sunflower Thrust."
"Sun Breathing, Eighth Form: Sun Halo Dragon Head Dance."
"Sun Breathing, Ninth Form: Setting Sun Transformation."
"Sun Breathing, Tenth Form: Beneficent Radiance."
"Sun Breathing, Eleventh Form: Sun Halo Dragon Head Dance."
Tanjiro moved like a blazing dragon amid the falling snow.
Then—
"Sun Breathing, Twelfth Form: Flame Dance."
With a final powerful swing, he completed the sequence.
But he did not stop.
He repeated the entire cycle once more.
Not repetition—
Integration.
That was the Thirteenth Form.
The continuous execution of all twelve forms in succession.
Ryuya exhaled slowly.
"So this is Sun Breathing."
Even without a Nichirin Blade, the heat radiating from Tanjiro's movements was astonishing.
If Muzan Kibutsuji were standing here right now—
Would he instinctively recoil in terror?
The memory of Tsugikuni Yoriichi was carved into Muzan's very being.
Tanjiro lowered his instrument, breathing hard.
"Mother, I'm finished."
"You did wonderfully, Tanjiro," Kie Kamado said gently.
The family began cleaning up the ritual space.
Snow continued drifting quietly from the sky.
Ryuya approached Nezuko.
"Nezuko."
"Hm?"
She looked up at him.
"May I ask you for a favor?"
At dinner, he had heard Kie and Tanjiro praising the ceremonial outfit Nezuko had sewn.
An idea had formed in his mind.
A very bold one.
Kokushibo and Tsugikuni Yoriichi had once been twins.
Their appearances had been nearly identical.
Even after becoming a demon, Kokushibo still bore a striking resemblance to his younger brother.
Muzan's fear of Yoriichi ran deep—so deep that it bordered on instinct.
What if—
Kokushibo wore Yoriichi's clothing?
The Hanafuda earrings.
The silhouette.
Facing Muzan with his back turned.
And then calmly saying—
"What do you take life for?"
Just imagining Muzan's reaction was amusing.
Ryuya's lips curved faintly.
Yes.
If he was going to scare Muzan—
He might as well go all the way.
Harboring such mischievous intentions, Ryuya carefully explained his request to Nezuko.
...
Author's Note:
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