Of course, Emiya wasn't going to do something like that.
With the amount of time he had, why waste it creating a breathing style himself?
He could explore other worlds.
Eat better food.
See better scenery.
So he had no intention of putting in that kind of effort.
But that didn't matter.
If he didn't want to do it, someone else could.
Just not the Demon Slayer Corps.
Another group was more suitable.
Emiya packed up all the breathing styles and sword techniques.
He told Hephaestus he was going on a trip.
Then he left the Demon Slayer world.
The next second, he appeared inside Ryōzanpaku.
His sudden arrival immediately drew attention.
The masters, led by Hayato Fūrinji, gathered in the hall.
"Well now," Hayato said with a laugh, eyeing the pile of packages at Emiya's feet.
"Hello, young Emiya. What are those?"
"Special breathing styles," Emiya replied calmly.
Last time, the ones who went with him to the Hunter world were Hayato, Shio Sakaki, and Shigure Kōsaka.
Those three had learned Nen.
Now, Ma Kensei, Apachai Hopachai, and Akisame Koetsuji had learned it as well.
Clearly, Nen had been passed on after their return.
With their foundations, learning it wasn't difficult.
"Are these for us?" Akisame asked.
"Yes."
Emiya opened a package and handed out five books.
"Read these first. Then tell me what you think."
They nodded and began reading.
Emiya sat down, poured himself black tea, and looked out at the blue sky.
It was around two in the afternoon.
Miu Fūrinji wouldn't be back yet.
She had club activities.
Probably four or five.
Soon, the masters finished reading.
"These breathing styles are excellent," Hayato said.
"Better than any breathing method I know."
This world had its own breathing systems.
Qi cultivation.
Ryōzanpaku's masters were experts.
Otherwise, they wouldn't be able to cultivate ki at all.
Shio Sakaki frowned slightly.
"If I'm not mistaken, these five styles feel related."
"I felt the same," Ma Kensei agreed.
"They seem derived from a single source."
Emiya nodded.
"Correct."
"The five styles-Wind, Flame, Water, Thunder, and Stone-were all derived from one."
"That original style is called Sun Breathing."
"It's the origin of all breathing styles in that world."
He stood up and walked into the courtyard.
A katana appeared in his hand.
"I'll demonstrate."
Emiya performed the Hinokami Kagura.
Every form.
Every motion.
When Kamado Tanjiro used it, flames followed his blade.
That was just an effect.
There were no real flames.
No water dragons either.
But the killing intent was unmistakable.
Sharp.
Heavy.
Thirteen forms.
All completed.
Each movement consumed stamina.
And each breath restored it.
That was why Tanjiro's father had said the dance could continue endlessly.
Emiya stopped after one full cycle.
He explained the rhythm.
The breathing.
The structure.
Then he asked, "Did you learn it?"
Every master nodded.
Hayato had already adjusted his breathing.
He had grasped Sun Breathing.
Reaching Total Concentration Constant would only take a few days.
Akisame stroked his chin.
"You didn't bring these just to show us."
"You want something."
"Smart," Emiya said, snapping his fingers.
He returned to the hall and opened the remaining packages.
"These contain over a hundred breathing styles and matching sword techniques."
"What I want is simple."
"Use Sun Breathing as the core."
"Integrate everything."
"Create a breathing style that surpasses Sun Breathing."
Shio Sakaki stared at the pile.
"...That's not simple."
"A hundred styles is a lot."
"With just us, it'll be hard."
"Can't do it?" Emiya asked calmly.
Ma Kensei rubbed his head.
"This is a massive project."
"Then find more people," Emiya said casually.
"There are other masters in this world."
"I know you have connections."
"If that's still not enough-go find Yomi."
Shio's expression hardened.
"No. Not Yomi."
"I agree," Ma Kensei said immediately.
Shigure nodded as well.
Emiya shrugged.
"I didn't say cooperate fully."
"Poach them."
"Many of the One Shadow, Nine Fists used to be your comrades."
Silence followed.
They couldn't deny it.
"I remember," Emiya continued,
"Kensei Sakaki was once Ryōzanpaku's disciple, right?"
Hayato shook his head.
"Not him."
"He strayed."
"He chose the Asura path."
"Giving someone like that a breathing style would only cause problems."
"Then find someone else," Emiya said.
He turned to Shio.
"Akita Hongo-the Fist God."
"He was your friend."
"Bring him back."
Shio's scar twitched.
That scar came from Akita.
But he didn't refuse.
"I can try," he said slowly.
"No promises."
"You have Nen now," Emiya said.
"Beat him up."
Shio smiled.
"That works."
Emiya turned to Ma Kensei.
"Ma Kensai is your brother."
"That shouldn't be an issue."
Ma Kensei smiled bitterly.
"You really know Yomi well."
"But you're right."
"I'll handle him."
"Bringing my brother back would end a long regret."
Emiya nodded.
Then he looked at Hayato.
"Fist Demoness Mikumo Kushinada."
"She's yours."
Hayato sighed.
"We do have history."
"But it was long ago."
"Just youthful friendship."
"She once fought Yomi alongside me."
"Destroyed several of their bases."
"Then she left."
"I don't even know why she joined them."
"It won't be easy."
Emiya thought for a moment.
"Then I'll handle her."
"You just arrange a meeting."
"I'll persuade her."
Hayato hesitated.
But nodded.
Then asked, "How?"
"She's not easily swayed."
Emiya replied calmly.
"People want things."
"Food. Shelter. Purpose."
"Martial artists aren't different."
"If she wants to kill, I'll give her enemies."
"If she wants to fight, I know plenty of maniacs."
"If she wants money, I'll give her money."
"If she wants eternal life-"
"I can give that too."
"On the condition she works for me."
"As long as someone has desires, there's a way."
"Don't you think?"
Silence.
The masters stared at him.
After a long pause, Hayato smiled wryly.
"If I didn't know you..."
"I'd think you were a devil."
Emiya smiled faintly.
"You're mistaken."
"Sometimes, a devil is kinder than I am."
He was, of course, thinking of a certain angel from a very peaceful Demon World.
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