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Waking up at the Sakuragi family home before dawn, Tanjiro was already huffing and puffing through his drills, sweat covering his body like morning dew.
This kid had great talent and an indomitable will, which made Kael quite pleased.
Of course, the main reason was that Tanjiro had a cute sister, Nezuko.
Who knows, one day they might end up as family, so he was just looking after one of his own in advance.
By the time Kael found him, the bluestone-paved ground was already soaked with Tanjiro's sweat.
"Big Brother!!"
Seeing Kael in his pajamas with a lazy expression, Tanjiro shouted out in a loud, clear voice.
"Quite energetic."
Kael tucked his hands into his sleeves, walked over with a yawn, looked Tanjiro over, and commented.
"Your foundation is good, and your muscle development is decent."
"Hehe~"
Tanjiro scratched his head, feeling a bit embarrassed.
"Let me see your level in actual combat swordsmanship."
As he spoke, Kael reached out and snapped a ten-centimeter twig from a tree in the courtyard, stripped the leaves, and prepared to give this Iron Head some pointers.
"Eh?!"
Tanjiro was a bit nervous when he heard this, but when he saw the small twig in Kael's hand, he didn't know what to say for a moment, only casting an uncertain look.
Big Brother, are you serious?
Kael didn't speak; he raised the twig and tapped it toward Tanjiro, signaling him to hurry up.
"In that case, please excuse my rudeness!"
Tanjiro gripped his sword with both hands and attacked Kael. Although his movements looked sharp, he was still holding back, ready to withdraw his force at any time for fear of accidentally hurting Kael.
Seeing this, Kael raised his eyelids slightly, and while sidestepping to dodge, he gave his wrist a gentle flick.
Only a "swish" was heard.
The twig whipped hard against Tanjiro's chest.
This hit was so painful he almost jumped.
Looking down at his chest, a bright red mark appeared, stinging sharply as it mixed with his sweat.
Tanjiro looked at the relaxed Kael, a sense of confusion rising in his heart. Clearly, his big brother's movements weren't that fast, so why couldn't he dodge?
"Hurry up, Mitsuri will be calling me for breakfast soon."
Kael urged. It was rare for him to spend time giving pointers; usually, in the Demon Slayer Corps, only the Hashira received such treatment.
Tanjiro took a deep breath, his eyes becoming serious as he gradually realized the gap between them, not daring to relax for a second longer.
Then he saw Kael lunge toward him, followed by a series of scalp-numbing sounds in the air.
"Swish, swish, swish... Ah!"
In the end, Tanjiro couldn't help but cry out under Kael's encouragement.
Kael's control of force was simply too good, maximizing the pain without actually causing real injury.
Hurting the skin without damaging the flesh.
This skill was inherited from Folk Kael.
Those exotic folk girls played quite roughly, so Kael naturally had to adapt to the local customs.
Hehe.
Tanjiro quickly understood that Kael was pointing out the openings in his attacks and correcting some of his disjointed and uncoordinated breathing movements.
Although it was a bit painful, the improvement brought by this correction was visible to the naked eye, and Tanjiro could clearly feel it.
This could be considered teaching according to the student's needs; compared to verbal advice, it was easier to remember through the body.
Just as Tanjiro was in a state of painful bliss, a call from Kanroji Mitsuri interrupted their movements.
"Darling!"
"Coming, baby~"
Kael's expression changed instantly. He tossed the twig aside, left Tanjiro where he was, and ran off to be affectionate with his wife.
A beautiful day starts with being close to Mitsuri.
Fortunately, Kanroji Mitsuri remembered they had a little brother in the house and called Tanjiro over for the meal.
For members of the Demon Slayer Corps, missions didn't come every day. Tanjiro hadn't received an assignment for the past two days, and his Kasugai Crow had even become well-acquainted with Xiao Bai, eating until it was a whole size rounder.
There was no helping it; the food in the Sakuragi family was too good. Aside from the couple, no one in the house didn't get fat.
Although he hadn't been there long, Tanjiro felt his strength was improving rapidly, and his admiration for his big brother Kael was like a surging river.
In truth, Kael was just helping Tanjiro realize the accumulation of his years of hard work.
The root was still Tanjiro's own effort; without those years of accumulation, even if Kael had the power to turn stone into gold, he wouldn't have been able to make Tanjiro's strength leap so quickly.
Besides that, Nezuko's strength had also significantly improved.
This was much easier than molding Tanjiro; he just needed to keep Nezuko well-fed.
Nezuko, who had never eaten in the past, had every cell in her body in a state of hunger. She usually had to rely on a semi-dormant state to reduce consumption, so how could she have a chance to grow?
After two days of nutritional feeding by Kael, Nezuko's mental state had visibly improved, at least to the point where she didn't need to spend a lot of time sleeping to recover her stamina.
Furthermore, her physical fitness had undergone a transformative change, to the point where she could even arm-wrestle with Kanroji Mitsuri.
Although she never won.
Kael had also studied and compared the blood of the siblings.
To be honest, it was a pity for Tanjiro to remain human; his constitution had an extraordinary adaptability to demon blood. If he were to join Kibutsuji Muzan's ranks, he would be guaranteed at least an Upper Rank position in the future.
Tens of thousands of people had physical exams at Sakuragi Hospital every year, but not one could compare to Tanjiro.
Saying he was one in ten thousand was an understatement.
"Tanjiro, you must remain a good human."
Kael looked at Tanjiro's physical exam report and said this to him, leaving the Iron Head completely bewildered.
What kind of talk was that?
"Aaaaaah!"
Suddenly, the sound of a pig being slaughtered came from the hospital corridor.
A blond boy wearing a yellow haori with a triangle pattern was being pinned to a bed like a fattened New Year's pig by several strong male nurses to have medicine applied.
Kael had improved and perfected the medical system of the Demon Slayer Corps, merging the Butterfly Mansion into Sakuragi Hospital. Most injured Demon Slayer Corps members were naturally sent here for treatment.
In this hospital building specifically for the Demon Slayer Corps, most people were members of the corps, and many were retirees from the Kakushi.
"Why is it a male nurse! I want a young and beautiful female nurse!"
The blond boy loudly protested the injustice of fate.
Clearly, other wounded were looked after by female nurses, so why was it a man when it came to him?
Could this discrimination be any more obvious?
"Who told you to harass the female nurses!"
The head male nurse took out restraint straps and tied up the struggling blond boy.
"I didn't! You're lying! I was just proposing to her!"
The blond boy argued aggrievedly.
"Who proposes to someone they just met?!"
Upon hearing this, the people around turned their heads away one by one.
Yes, please pull the straps tighter; don't let this pervert escape.
"Xiao Gang, gag that guy; no loud shouting is allowed in the hospital."
Kael said to the head male nurse.
"Yes!"
Xiao Gang took a white sock from his pocket and stuffed it into the blond boy's mouth.
"Remember to transfer him to the Proctology Department for a check-up."
Kael added another sentence.
Upon hearing this, the blond boy struggled even harder, but it didn't hinder him from being moved closer to the Proctology Department.
Members of the Demon Slayer Corps were human too, and they could get hemorrhoids. It was normal for the hospital to have a Proctology Department.
Some time ago, this department had even performed a hemorrhoidectomy for a certain Hashira who wished to remain anonymous.
Although the hospital maintained the privacy of this Hashira, according to internal rumors within the Demon Slayer Corps, they always suspected that the one who suffered this heavy blow was the Sound Hashira.
Otherwise, they couldn't think of any reason why the usually flamboyant Sound Hashira would stay so quiet and well-behaved in the hospital for so many days.
Tanjiro looked at the blond boy being sent to the execution ground—er, the Proctology Department—and felt he looked a bit familiar. After reminiscing for a moment, he remembered their meeting.
"He seems to be from the same batch as me who passed the selection."
"Is that so? Want to go visit him?"
Kael suggested. Without giving Tanjiro a chance to refuse, he put an arm around his shoulder and headed for the Proctology Department.
Before even getting close to the consultation room, Tanjiro already smelled the aura of fear permeating the air. He couldn't help but swallow, his footsteps becoming heavy.
"Aaaaaah—!!"
The tragic intensity of this scream was many times higher than before.
Tanjiro's body shivered along with it.
"Big Brother, maybe we should just forget it!"
Tanjiro's footsteps stopped, and he stood frozen in place, as if something unspeakable at the end of the corridor was devouring people's ideals and senses.
"Don't be nervous. The doctors in the Proctology Department are very gentle; this is just a routine check-up."
As Kael spoke, Tanjiro saw a hairy, thick black arm reach out from the consultation room and point to the next patient.
"..."
Tanjiro shook his head vigorously, refusing to take another step forward. Based on his understanding of his big brother, it was best not to trust him when there was no danger.
Following that, the blond boy was pushed out with his rear up, revealing half of his fair buttocks, his head buried under a pillow as if he had been broken.
"Are you okay?"
Seeing this, Tanjiro's sympathy began to well up, and he asked in a small voice.
"I... I'm never coming to the hospital again."
The blond boy reacted like a computer restarting and hugged Tanjiro while crying.
He likely recognized the other's status as a peer from the same batch and found a bit of security in that familiarity.
Everyone in the hospital is a bad person!
Sobbing.
The blond boy was currently a picture of tearful misery.
"In a hospital, you must know how to be quiet, young man."
Kael's eerie voice reached the blond boy's ears, almost making him faint on the spot. His expression instantly collapsed, and he hugged Tanjiro, shaking like a leaf.
However, in the next second, a commotion broke out nearby.
"Get lost! I know my own injuries! I don't need you to treat me!!"
A violent young man with a mohawk and a scarred face jumped off the hospital bed, brushing off the nurses nearby.
"Why are there so many problem children today?"
Kael muttered and stepped forward to block the violent youth's path.
"Get lost!"
The violent youth reached out to push him, but as soon as he spoke, his vision spun, and he ended up flat on the ground. He didn't even realize what had happened.
"Give me his identification info."
Kael reached out to the nurse nearby, took the materials, and gave them a quick scan.
"Shinazugawa Genya. What's your relationship with Sanemi Shinazugawa?"
"What's it to you?"
Shinazugawa Genya struggled to get up, his tone still aggressive, but this time he didn't dare to strike out easily.
"I've long heard that the Wind Hashira has a good-for-nothing younger brother. Looking at you now, you really are quite good-for-nothing."
Kael said, curling his lips.
He remembered when he first drew blood for Sanemi Shinazugawa's physical exam and almost made the man faint from the amount taken.
Marechi—that's the best catalyst for demon blood, especially the kind of Marechi among Marechi that the Wind Hashira possessed.
Kael always picked a sheep and sheared it to the bone.
At that time, Sanemi Shinazugawa thought it was normal, but later he realized that wasn't called a blood test; it was called a blood donation. Feeling targeted, the Wind Hashira had held a bit of a grudge against Kael ever since.
"What did you say?!"
Sanemi Shinazugawa angrily lunged forward.
Then, in the blink of an eye, he was lying on the ground again.
This time, Kael didn't give him another chance to get up and waved to Xiao Gang and the others.
"Tie him up and send him to the Proctology Department."
"Yes!"
Xiao Gang and the others held Sanemi Shinazugawa high up, a treatment several levels above the blond boy's.
"Let me go!!"
Sanemi Shinazugawa tried to struggle, but his strength was limited, and he couldn't break free from Xiao Gang and the others.
"Remember, the examination must be thorough."
Kael added.
With the two previous examples, the atmosphere in the hospital suddenly became much quieter, and the wounded were extremely cooperative... The next day, Tanjiro and Zenitsu Agatsuma received a mission from headquarters. In the city's south-southeast direction, there were suspected traces of a demon.
Standing at the entrance of the Sakuragi home, Tanjiro looked hesitant.
"Um, Big Brother, maybe let Nezuko come with me..."
"Off you go!"
As soon as he spoke, Tanjiro was kicked out of the house by Kael.
Nezuko was left at home by Kael.
This naturally had a very legitimate reason; a single sentence about helping her become human was enough to shut Tanjiro's mouth.
Only now, Tanjiro felt like regretting it.
It wasn't that he didn't trust Kael; he just couldn't bear to part with her, even though he knew this was the most correct and safe thing for Nezuko.
Unfortunately, Kael didn't give him a chance to regret and slammed the door shut.
Zenitsu Agatsuma, who was waiting outside, saw this and came forward to help Tanjiro up, patting the dust off him with a look of eager flattery.
This was his life-saving thigh; he had to cling to it tightly.
"Tanjiro, are you okay? Whether I can come back alive to get married depends entirely on you. You must pull yourself together."
"I'm fine, let's go."
Tanjiro looked back once more and then set off with Zenitsu Agatsuma.
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