Yae's father was placed in a secluded area not far from the Demon Slayer Corps outpost, with wisteria flowers, which demons detest, planted both inside and outside the house.
When Yae was seen again, the young girl was wearing the Demon Slayer Corps uniform, with a Nichirin Blade at her waist.
"Miss Mizuki!" From a distance, Yae saw her benefactor, who had saved her father from the two Hashira, and excitedly ran over from afar.
"Long time no see, Miss Yae." Mizuki smiled slightly and greeted her.
Yae's face was filled with gratitude: "I've always wanted to thank you."
After joining the Demon Slayer Corps, she truly understood what kind of pressure Miss Mizuki had endured to save her father from the two Hashira.
Whenever she thought of this, Yae was deeply moved.
"Miss Yae comes to keep watch every night." Kochou Shinobu smiled and introduced: "Because she has to take care of her father, the Master specially sent someone to teach her Breathing Technique and provided her with a Nichirin Blade."
"She is already a member of our Demon Slayer Corps."
Mizuki nodded slightly. Allowing a demon to live in the Demon Slayer Corps outpost was already a high degree of trust; at least safety issues could not be ignored.
Yae also didn't want to cause trouble for others.
Yae scratched her head a little awkwardly: "Well, even though my Breathing Technique is still half-baked, it's embarrassing for the Demon Slayer Corps to mention it."
Kochou Shinobu shook her head: "No, Miss Yae is very talented. It's already impressive to cultivate Breathing Technique to this level in two years."
Mizuki subconsciously used Transparent World. In her observation, the girl's breathing operation method was... Wind Breathing?
Although a bit immature and not even reaching the realm of Total Concentration Breathing, joining the Demon Slayer Corps would certainly not be a problem.
She seemed to be quite a bit behind Tanjirou, but it should be noted that Tanjirou's aptitude was already considered high within the Demon Slayer Corps, second only to a genius like Tokito Muichiro.
However... she had thought it would be Flame Breathing. After all, Yae's personality was more outgoing and carefree, which should get along well with the Flame Hashira.
The two chatted for a while, and Yae's gaze fell on Yushiro and Tamayo, who were carrying large and small bags beside her: "Who are these two?"
Mizuki: "They are doctors."
Yae was stunned for a moment, then showed a joyful expression and said in a fluster: "That, that, I'll go open the door right away!"
Yae often exchanged letters with Mizuki and had been waiting for the doctor Mizuki mentioned for two years.
Yae fumbled to the front of the house and opened the door, while Kochou Shinobu thoughtfully pushed aside the wisteria flowers outside the house for everyone.
"Please."
"Thank you." Tamayo's impression of this girl deepened; she was a meticulous and gentle person.
Everyone entered the house surrounded by wisteria flowers. A faint smell of blood emanated from inside, and a demon was chained in the center of the room.
Seeing everyone enter, the chains clanked, and the gray-haired demon bared its fangs at them, looking as if it wanted to tear them to shreds, but the chains held it firmly, preventing it from breaking free.
"Dad!" Tears welled up in Yae's eyes. She wiped them away and explained, "It's like this now; recently, Dad's lucid time has been getting shorter and shorter."
At first, because of Yae's calls, the old man could often remain lucid, but as time passed, his lucid periods became shorter.
Tamayo noticed the traces of blood in the vessel placed nearby and immediately understood.
"Blood alone cannot sustain a demon's basic needs. Over time, he will inevitably lose his sanity due to hunger."
Yae quickly asked: "Then what should we do?"
Tamayo soothed her with a gentle expression: "Don't worry, I'm here to solve this problem."
Seeing Tamayo's calm face, Yae's anxious heart couldn't help but calm down a lot.
"Although I can't guarantee he'll become like a normal person, he can be transformed like Yushiro and me, able to maintain sanity by only consuming a small amount of blood."
Kochou Shinobu's expression was slightly startled. Indeed... the putrid smell of ordinary demons she encountered almost overflowed, yet she didn't detect any putrid smell from this woman.
Perhaps their temperaments were similar, which instead gave her a feeling of closeness.
Yae was a little excited: "Is that possible?"
Tamayo nodded lightly: "I think this old man himself possesses a certain uniqueness, so I believe it can succeed."
Transforming a demon to be like them is not simple; over hundreds of years, the only successful cases have been her and Yushiro, whom she turned into a demon.
But that old man's constitution is special, so it might succeed.
Tamayo surveyed the house for a moment and asked: "It might not be possible to perform surgery here. Could I trouble Miss Kochou to find a larger room?"
Kochou immediately stated: "Of course, my Butterfly Mansion is not far from here; we can go there."
"Then I'll trouble you." Tamayo thanked her, then looked at Mizuki, "The task of controlling this old man will be left to you, Mizuki."
"Piece of cake." Mizuki flexed her bicep.
Mizuki approached the old man.
"Ugh roar~" The old man's face was ferocious, making whimpering sounds like a wild beast, as if waiting for an opportunity to harm someone.
Yae volunteered: "I'll help."
"No need." Mizuki rolled up her sleeves and chopped down at the old man's neck with a hand chop.
The old man's ferocious face stiffened, his dark eyes rolled upwards to reveal the whites, and his struggling body suddenly went limp.
Yae's eyes widened, speechless. It was the first time she knew that a demon could be knocked out.
Mizuki looked back at Tamayo: "This should be enough, right?"
Tamayo: "..."
With Mizuki's help, everyone easily controlled the raving patient, even simpler than administering anesthesia.
The group headed to the Butterfly Mansion.
"Miss Shinobu, you're back." Upon arriving at the Butterfly Mansion, a black-haired, blue-eyed girl with twin pigtails opened the door for them.
Kochou Shinobu knew it wasn't the time for introductions and instructed: "Aoi, please prepare an operating room for me."
"I understand." Kanzaki Aoi bowed to everyone and quickly went to work.
Kochou Shinobu guided everyone: "Please follow me."
They took the old man to the operating room, where various medical instruments were an eye-opener.
In this era, just such equipment must have been a huge expense.
The Ubuyashiki family's terrifying supernatural intuition had accumulated a vast amount of wealth for them, which was truly enviable. Perhaps this was also a small aid granted by heaven for their subjugation of Muzan.
Tamayo scanned the room and thanked: "The equipment is very complete, Miss Kochou is thoughtful."
"It's nothing..."
Seeing Kochou Shinobu hesitate, Mizuki asked: "What's wrong, Shinobu?"
Kochou Shinobu opened her mouth, "There's something I'd like to ask of Miss Tamayo."
Tamayo smiled: "Miss Kochou, please speak freely."
Kochou Shinobu pursed her lips: "When Miss Tamayo performs the surgery, I hope to be allowed to observe."
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