"I am Kochou Shinobu, Kocho Kanae's younger sister."
Kochou Shinobu scrutinized the young man before her. He looked only in his teens, far too young. Why would her elder sister recommend him as a physician?
"Yes."
Facing Kochou Shinobu's inquiry, Kamihara Tetsuya appeared neither servile nor arrogant. "My name is Kamihara Tetsuya."
Even Akaza did not know the name Kamihara Tetsuya, so he was not worried about being exposed at all.
The only people who knew this name belonged to a demon were Kocho Kanae, Tamayo, and Yushiro. As Kamihara Tetsuya expected, Kochou Shinobu's expression remained normal.
"Age?"
"16."
"Origin?"
"Tokyo Prefecture, Ikebukuro district."
...
After learning some basic information, Kochou Shinobu's expression turned serious. "When did you and my elder sister, Kocho Kanae, meet?"
"Four months ago, in a coastal town, Kanae-Miss saved me from a demon…"
Kamihara Tetsuya had already prepared for this.
With Kocho Kanae vouching for him, Kochou Shinobu could not find any logical loopholes.
Kochou Shinobu nodded. Four months ago, her elder sister Kocho Kanae had indeed carried out a mission in a coastal town. She had already helped Kamihara Tetsuya complete the mental reconstruction.
Her elder sister saved this young man, then discovered he had professional medical knowledge, and recommended him to Butterfly Mansion.
"This is a test paper. I need to assess your professional knowledge." Kochou Shinobu took out a test paper.
Kamihara Tetsuya took the paper. Because of Kocho Kanae's recommendation, he had already gained Kochou Shinobu's basic trust. The Demon Slayer Corps' recruitment was largely unrestricted; they were all unfortunate people who had been harmed by demons.
So, this was just a basic procedure.
The two entered the inner room.
Kochou Shinobu brought a small table for Kamihara Tetsuya, then sat aside to read, supervising while studying toxicology.
Kamihara Tetsuya had no need to cheat. Kochou Shinobu could not conjure a test paper out of thin air, and Kocho Kanae had already told him the contents of Butterfly Mansion's test paper.
In the quiet room, only the sound of Kamihara Tetsuya writing furiously could be heard.
His speed was so fast that even Kochou Shinobu frequently glanced over, a hint of surprise flashing in her beautiful eyes. Although she had not yet seen Kamihara Tetsuya's answers, his answering speed was truly astonishing.
Time passed, and after more than half an hour, Kamihara Tetsuya submitted the completed test paper.
Kochou Shinobu took the paper, scanning it ten lines at a time, already forming a rough judgment in her mind.
Kamihara Tetsuya asked, "Shinobu-Miss, how was it?"
Kochou Shinobu replied, "It should be above ninety points."
Then, Kochou Shinobu's brows furrowed. Some of the answers were too perfect. It was likely that her elder sister Kocho Kanae had given this young man the answers.
"Sigh!"
Kochou Shinobu sighed. There was no mistake now; this was something her willful elder sister would do.
"Butterfly Mansion welcomes your joining."
Kochou Shinobu said. Although she knew her elder sister had cheated for this young man, she did not intend to refuse him.
Even if his professional knowledge was not up to par, this young man was very young and could be nurtured.
In other words, her elder sister was even willing to give this young man the answers, hoping he would join Butterfly Mansion!
How could Kochou Shinobu bear to refuse?
"Thank you!"
Kamihara Tetsuya smiled slightly. Just as he expected, it was truly terrifying. With Kocho Kanae's help, entering Butterfly Mansion was like coming home!
It perfectly confirmed the saying that the strongest fortress is easiest to break from within.
Even writing the answers so perfectly was Kocho Kanae's idea. She understood her younger sister too well; Kochou Shinobu would be angry at her willfulness, but in the end, she would definitely agree and clean up her mess.
"By the way, why haven't I seen Kanae-Miss?" Kamihara Tetsuya deliberately asked, as this persona was not supposed to know Kocho Kanae's situation.
Upon hearing Kamihara Tetsuya's question, Kochou Shinobu's delicate body stiffened, but she quickly recovered. There was a hint of bitterness in her eyes. So, he still did not know. "My elder sister sacrificed herself two months ago during a mission."
"How could this be!"
Kamihara Tetsuya seemed greatly shocked, his face filled with sorrow, and he feigned shedding two lines of tears.
At the same time, Kamihara Tetsuya frowned. He had received direct confirmation from Kochou Shinobu, yet the damn system had not popped up.
"You will follow me and learn these days, familiarizing yourself with Butterfly Mansion's work procedures," Kochou Shinobu said.
Kamihara Tetsuya's lips twitched. It seemed that gaining Kochou Shinobu's acknowledgment was not yet considered joining the Demon Slayer Corps.
He was disguised as a human using Blood Demon Art, not a true human. He did not have an Immune Constitution, and if exposed to sunlight, he would instantly perish.
Kamihara Tetsuya's mind raced. "Since I have too many things to move, I'll be outside dealing with them these days. I might only have time to come and learn at night."
"No problem."
Kochou Shinobu was not overly suspicious. After all, he was recommended by her elder sister, so she nodded in understanding.
Kamihara Tetsuya left Butterfly Mansion with doubts, cursing the damn system in his heart, wondering what else it wanted him to do.
This excuse could only temporarily appease Kochou Shinobu. Over time, she would definitely become suspicious.
However, he could only push through.
Time flew by. Kamihara Tetsuya hid outside during the day and went to Butterfly Mansion to learn at night.
"This is Kanzaki Aoi, a Water Breathing style swordsman, temporarily helping out as a nurse at Butterfly Mansion."
"This is Kanao Tsuyuri, my and my elder sister's adopted sister. She is working hard to become a qualified swordsman and occasionally helps in the infirmary."
...
Kochou Shinobu introduced the staff of Butterfly Mansion to Kamihara Tetsuya one by one.
Kamihara Tetsuya scanned them with a glance. There were more people than he expected, probably over twenty. They were all famous physicians and nurses. In the original timeline, only a few could appear, likely because they were unrelated to the main plot.
However, he already knew their names from Kocho Kanae, and he still had to feign humility, listening to Kochou Shinobu introduce them.
"Hello!"
"Hello!"
Both sides greeted each other warmly. After all, they would be working together, constantly seeing each other.
Only Kanao Tsuyuri smiled faintly, standing still like an exquisite doll.
"This child's personality is just like that; don't mind it," Kochou Shinobu said with a smile.
Kamihara Tetsuya nodded gently.
Afterward, Kamihara Tetsuya followed Kochou Shinobu into the infirmary, observing patients and studying medical knowledge.
To quickly obtain an Immune Constitution, Kamihara Tetsuya secretly used his Sharingan to learn, memorizing theoretical knowledge instantly and perfectly replicating Kochou Shinobu's actions in practical operations.
His progress was astonishingly fast, even catching up to veteran physicians who had practiced for many years.
Kamihara Tetsuya's excellent performance even secretly shocked Kochou Shinobu; his learning speed was too fast.
No wonder her elder sister did not hesitate to give him the answers just to get him into Butterfly Mansion. Such a talent was rare and hard to come by.