Whether it was Wind Breathing or Serpent Breathing, neither could increase the user's lung capacity several times over in an instant.
For a Hashira, blowing up a giant gourd was merely the basics.
Their lung capacity was already several times that of an ordinary person; even Kiyokawa Izumi, who was at a slight disadvantage, was likely more than double that of a normal human.
These results weren't achieved instantly through a Breathing Technique, but were gradually improved through arduous and strict training.
Precisely because of this common knowledge, Sanemi and Obanai felt that Kiyokawa Izumi wasn't thinking clearly—he must have injured his head, otherwise how could he spout such nonsense?
Imagine if a Hashira's lung capacity, which already far exceeded ordinary people, could be increased to four times its usual level in an instant; the boost to their strength would be considerable.
Even if it couldn't compare to the boost from Awakening the Demon Slayer Mark, there wouldn't be a qualitative gap—most importantly, it wouldn't have the side effects of an Acquired Demon Slayer Mark, meaning one wouldn't necessarily die before age twenty-five.
Of course, a fourfold increase was just the upper limit; even Kiyokawa Izumi himself hadn't managed to achieve it.
During the battle with Gyokko, his lung capacity increase was roughly double, certainly not reaching three or four times.
Naturally, he was only a user, not the creator.
There were some principles he hadn't fully figured out himself.
Whether it was activating the entire body or increasing muscle density, everything required further detailed research.
And since this Taijutsu essentially utilized breathing to enhance oneself, the requirement for Chakra wasn't large; whether or not one had Chakra only determined the upper limit.
A bow and arrow made from ordinary bamboo would certainly be far inferior to a modern compound bow, but that didn't mean a bamboo bow couldn't be used.
It might not be as effortless and might not shoot as far.
In this world dominated by Breathing Techniques, the Seven-Day Breathing Method certainly held great reference value.
Kiyokawa Izumi had no intention of keeping it to himself; he was willing to share it with everyone in the Demon Slayer Corps.
The only thing to note was that it couldn't be used simultaneously with one's own Breathing Technique—after all, they involved two completely different breathing rhythms.
Gaining something from it was certain, but how much was hard to say.
Even Kiyokawa Izumi himself would have to spend a very long time combining the two.
When using only the Seven-Day Breathing Method, although his basic attributes were significantly enhanced, the skills he could use were extremely limited; with only the Sharingan, he couldn't use Dark Breathing, Fourth Form.
He would certainly become much stronger in the short term.
Correspondingly, the upper limit would also be lowered considerably.
After he finished explaining in detail, Sanemi, his brow furrowed, didn't immediately speak up to refute him, but instead seriously considered whether it was feasible.
"A new Breathing Technique? I don't see any trace of the Five Basic Breathing Techniques at all. How on earth did you create this?"
Sanemi finally understood why this guy's strength could increase so much.
But he was still very puzzled, because this Breathing Technique was completely different from the existing Five Basic Breathing Techniques, with very few similarities.
"It seems you can be of some use after all. Pity it doesn't match my Breathing Technique."
Iguro Obanai's tone was indifferent, and his face showed no sign of regret—Serpent Breathing was a high-difficulty technique-based breathing style, and it didn't match the Seven-Day Breathing Method that well.
*Cough, cough—*
"Could you two please stop disturbing the patient's rest?"
A familiar voice suddenly rang out. Kochou Shinobu appeared at some unknown moment, looking at everyone with a smile on her face.
She expressed strong dissatisfaction toward the Wind Hashira and the Serpent Hashira.
They had already stayed here for a long time.
It had seriously affected the patient's rest.
Even Kochou Shinobu couldn't bear to watch any longer.
"Let's leave it at that for now!"
Sanemi, who still wanted to ask more, could only keep his questions to himself as he stood up and left silently.
"Recover quickly. Don't even think about quitting, do you understand?"
"That's really asking too much. At the very least, you should let me recuperate for two or three months, right?"
Looking at the still sharp-tongued Iguro Obanai, Kiyokawa Izumi could only force a bitter smile.
What was with that 'fight until you die' expression?
I don't want to!
"Mr. Kiyokawa Izumi, aren't you afraid that talking so much will affect your wound healing and leave lasting complications?"
Looking at Kochou Shinobu as she sat down nearby, Kiyokawa Izumi didn't ask why she was here, but instead thought of a very embarrassing problem.
He really needed to use the bathroom, what should he do?
Can you help me up?
Maybe I should hold it in a bit longer.
But how can one hold in such a thing?
"Um, can you help me up?"
"Mr. Kiyokawa Izumi, do you know how many ribs you've broken? Not just today, but tomorrow, the day after, and for a long time to come, you won't be able to move normally. The Master's orders have arrived: until you are fully recovered, you must recuperate here."
The Master's orders have already arrived; until you have completely recovered, you must rest here.
Veins couldn't help but throb on her fair forehead.
Why was this guy so disobedient?
Doesn't he know how serious his injuries are?
Can't he take better care of his own body?
"But..."
"No buts!"
Kochou Shinobu interrupted, struggling to maintain her smile.
"But I want to go to the bathroom!!"
"..."
Looking at the suddenly speechless Kochou Shinobu, Kiyokawa Izumi asked helplessly, "I can't exactly resolve it right here... I do have some hygiene standards. How about calling a male member over? I really, really can't hold it in anymore!"
_________
What do you think about donating energy stones today? I only got my phone for a short time, and I'll be back to automatic posting tomorrow.