Demon Slayer: The Journey That Began When I Became Yoriichi's Sister

Yae's father was placed in a remote area not far from the Demon Slayer Corps' headquarters, where wisteria, which demons despise, was planted both inside and outside the house.

When I saw Yae again, the girl was wearing a Demon Slayer Corps uniform with a Nichirin Blade at her waist.

"Miss Yuko!" From a distance, Yae saw the benefactor who had saved her father from the two Pillars and ran excitedly towards her.

"Long time no see, Miss Yae." Yuko greeted her with a slight smile.

Yae's face was filled with gratitude: "I've always wanted to thank you."

After joining the Demon Slayer Corps, she truly understood the immense pressure that Ikuko had withstood to save her father from the clutches of the two Pillars.

Every time Yae thinks of this, she is deeply moved.

“Miss Yae comes to keep watch every night.” Butterfly chuckled and introduced, “Because she is responsible for taking care of her father, the lord specially sent someone to teach her breathing techniques and equipped her with a Nichirin Blade.”

"I'm already a member of our Demon Slayer Corps."

Yuko nodded slightly. Allowing a demon to stay at the Demon Slayer Corps's headquarters was already a high level of trust; at the very least, the issue of safety could not be ignored.

Yae also didn't want to cause trouble for others.

Yae scratched her head somewhat embarrassedly: "Well, although my breathing technique is still half-baked, it would be embarrassing for the Demon Slayer Corps to say it out loud."

Shinobu Kocho shook her head: "No, Miss Yae is very talented. It's already amazing that she has mastered the breathing technique to this level in just two years."

Yuko subconsciously used her Transparent Domain. In her observation, the way the girl was breathing was... Breath of the Wind?

Although he is still a bit inexperienced and hasn't even reached the level of Total Concentration Breathing, joining the Demon Slayer Corps is definitely not a problem.

He seems to be much worse than Tanjiro, but you have to know that Tanjiro's talent is already considered high in the Demon Slayer Corps, second only to geniuses like Muichiro Tokito.

but……

She thought it would be Flame Breathing, since Yae's personality is quite outgoing and her carefree manner should get along well with the Flame Pillar.

After exchanging pleasantries for a while, Yae's gaze fell upon Yushiro and Tamayo, who were carrying large and small bags beside him: "Who are these two?"

Yuko: "He's a doctor."

Yae was stunned for a moment, then her face lit up with joy, and she said in a flustered manner, "Um, um, I'll go open the door right away!"

Yae had been exchanging letters with Yuko, and had been waiting for the doctor Yuko had mentioned for two years.

Yae rushed to the front of the house and opened the door, while Shinobu Kocho thoughtfully parted the wisteria flowers outside the house for everyone.

"please."

"Thank you for your trouble." Tamayo's impression of the girl deepened even more; she was a thoughtful and gentle person.

The group entered the house surrounded by wisteria flowers. A faint smell of blood wafted from inside. In the center of the room, a ghost was chained with iron locks.

As the group entered, the chains rattled, and the white-haired demon bared its blood-red maw at them, looking as if it wanted to tear them apart. Unfortunately, the chains held it firmly in place, and it could not break free.

“Father!” Tears welled up in Yae’s eyes. She wiped them away and explained, “That’s how it is now. Lately, Father has been able to be lucid for less and less time.”

At first, thanks to Yae's calls, the old man was able to stay lucid most of the time, but as time went on, he was lucid for less and less of that time.

Tamayo noticed the bloodstains in the container placed to the side and immediately understood.

"Blood alone cannot sustain a demon's basic needs. Over time, it will inevitably lose its mind due to hunger."

Yae quickly asked, "Then what should we do?"

Tamayo reassured her gently, "Don't worry, I'm here to resolve this matter."

Seeing Tamayo's calm face, Yae's anxious heart calmed down considerably.

"While there's no way to guarantee that he'll become like a normal person, we can modify him to be like me and Yushiro, who can maintain their sanity by only consuming a small amount of blood."

Shinobu Kocho's expression faltered slightly; indeed...

Normally, ghosts would reek of decay, but she didn't smell any stench on this woman.

Perhaps it was because the two had similar temperaments that she felt a sense of closeness with them.

Yae was a little excited: "Is it okay?"

Zhu Shi nodded slightly: "I think this old man has certain special qualities, so I think he can succeed."

Transforming demons into their likeness is no easy feat; in hundreds of years, only she and Yushiro, who became demons, have achieved such success.

But that old man has a special physical condition, so he might succeed.

Tamayo looked around the room for a moment and asked, "It might be impossible to perform the surgery here. Could you please find a larger room, Miss Butterfly?"

The butterfly immediately replied, "Of course, my butterfly house isn't far from here, you can go there."

"That will trouble you." After thanking her, Tamayo turned to Ikuko. "The task of controlling this old man is now yours, Ikuko."

"No problem." Yu Zixiu flexed his biceps.

Yuko approached the old man.

"Ugh~" The old man's face was ferocious, and he made a whimpering sound like a wild beast, as if he was waiting for an opportunity to hurt someone.

Yae volunteered: "I'll help."

"No need." Yu Zi rolled up her sleeves and chopped at the old man's neck with a chop.

The old man's ferocious face froze, his dark eyes rolled upwards to reveal the whites, and his struggling body suddenly went limp.

Yae stared wide-eyed, speechless. It was the first time she had ever heard of a demon being able to be knocked unconscious.

Yuko turned to Tamayo and asked, "Is this alright?"

Tamayo: "..."

With Yuko's help, the group easily brought the crazed patient under control, even more easily than administering anesthesia.

The group headed to the Butterfly House.

"Miss Shinobu, you're back." When they arrived at the Butterfly Mansion, a black-haired, blue-eyed girl with twin tails opened the door for them.

Shinobu Kocho knew this wasn't the time for introductions, so she instructed, "Aoi, please prepare an operating room for me."

"I understand." Kanzaki Aoi bowed to everyone and then quickly went to do her work.

Shinobu Kocho guided the group, saying, "Please follow me."

The elderly man was taken to the operating room, where the variety of medical equipment was eye-opening.

In this day and age, such equipment alone must be a huge expense.

The Ubuyashiki family's terrifying hyperintuition allowed them to accumulate a vast amount of wealth, which is truly enviable. Perhaps this was a small favor bestowed upon them by heaven in their fight against Muzan.

Tamayo glanced around and said gratefully, "The equipment is very complete. Miss Butterfly is very thoughtful."

"It should be..."

Seeing that Shinobu seemed hesitant to speak, Ikuko asked, "What's wrong, Shinobu?"

Shinobu opened her mouth, "There's something I'd like to ask of Ms. Tamayo."

Tamayo smiled and said, "Miss Butterfly, please speak frankly."

Shinobu Kocho pursed her lips slightly: "Ms. Tamayo, I hope you will allow me to watch during your surgery."