Seated atop the Butterfly Mansion with his legs dangling in the air, Tanjiro watched over Mitsuri as she practiced the sword forms he had taught her, training alongside Kanao. From time to time, he instructed and guided both of them on how to advance and what stance they should take when engaging an opponent.
With the combat experience and abilities of Yoriichi, he was easily capable of such things and much more.
Not to mention that once he activated Transparent World, what were these young swordswomen? He could even educate Hashira on how to wield a sword properly.
'Hm...'
Looking down, he noticed they were actually doing a pretty fine job now.
Though Mitsuri's moves were not as refined as Kanao's, she had started to get a feel for the forms after daily practice with him and Kanao.
On the other hand, Kanao's comprehension had also improved rapidly with her Flower Breathing style, mastering all the techniques under his guidance and tutelage.
Although she was Shinobu's apprentice, that poison girl sadly had no time to teach Kanao properly. Shinobu could only do so much since she had never fully mastered Flower Breathing like her elder sister did. She simply couldn't because of her physique and small height, lacking the strength to decapitate even a normal demon's head.
That was why he had decided to teach Kanao as well after consulting with Shinobu, to which she readily agreed.
The next moment, Tanjiro activated Transparent World nonchalantly.
His crimson eyes turned a dark shade of red and acquired a pink luster.
The world changed colors immediately.
Mitsuri's and Kanao's bodies became transparent as his gaze now saw through them, closely observing their blood flow, muscle expansion, bone movement, lung expansion, and heartbeat.
Everything was laid bare before his eyes.
"Mitsuri, try controlling your breathing. You must resonate it with your sword forms. Don't just swing your sword like that," he instructed.
Mitsuri, with her sweaty body, could only ask. "Hu, how?"
His voice came immediately. "No stopping. No asking back. Concentrate..."
The poor curvaceous girl could only mewl quietly and resume her training as per her teacher's instructions.
Tanjiro focused on her inner body again and noticed some improvement, though only a tiny bit.
'It's only been two or three days. At her current pace, it won't take long for her to become an active Demon Slayer. But she must engrave Total Concentration Breathing into her lungs before attempting the Final Selection... Hmm.'
"Good. Now try keeping your body stable while you do that. No unwanted movements."
Being praised like that, a smile appeared on Mitsuri's face as she nodded. "Hai!"
He could only shake his head slightly.
Next, his emotionless gaze fell over Kanao's small body.
The moment it did, a serious-looking Kanao felt goosebumps all over her body, though she didn't stop.
She knew it was Tanjiro's doing. All the hair on her body would stand up whenever he did that. She realized it yesterday during the training session.
Therefore, she remained calm and continued to train as she waited for his guidance.
Shortly after, just as she expected, his voice reached her ears. "You're doing great, Kanao. Breathing is stable and sword forms are coming out perfectly."
Hearing his gentle words, Kanao's eyes softened drastically. She stopped to give him a slight bow.
'... Ohhh.' He sent her an approving nod.
"Mm, she's such a gentle and cute girl. I really want to pamper her right now. Haa..." Kanae, who was lying beside him, mumbled with an emotional face.
Tanjiro exhaled slowly.
'The way she acts, she must have been one hell of a clingy sister... Heh.'
Afterward, he jumped down and landed on his feet without feeling anything.
Mitsuri, some distance away, tensed up. 'Sparring time already!?'
Tanjiro perceived her emotions and chuckled out loud. "Your turn's later. Relax."
Upon hearing his words, a nervous yet excited look appeared on her face. 'Thought so...'
Kanao, on the other side, stopped and went into fighting stance instantly.
A one-on-one sparring session with Tanjiro, possibly the strongest Hashira in the organization?
She considered herself too lucky. So how could she not become thrilled?
From the very depths of her soul, she awaited these daily sparring sessions!
Tanjiro sensed her emotions and seriousness with a single glance, feeling amused.
'What a girl... Her spirit is commendable.'
"All right then, let's get started."
....
Five hours later~
"Onii-chan! Your uniform is here!" Nezuko's voice rang out from outside the lab. Her lovely face glowed with excitement.
The Demon Slayer uniform and the Sun Hashira haori had finally arrived!
The package was sealed, and she wanted her Onii-chan to be the one to open it, so she came running to tell him.
The next second the lab door opened and Tanjiro stepped out, wearing his usual kind expression.
He gave her a headpat—she leaned into it happily—and asked, "So how's the uniform? Did Nezuko check it already?"
She shook her head. "No, I wanted Onii-chan to open the seal! I kept it away from the others too." She took his hand and tugged. "Hurry, or they'll tear it open before you do."
Seeing her so desperate, a smile spread across his face naturally.
He relaxed his body completely and let his little sister drag him toward the mansion.
But when they reached the guest room, Nezuko's eyebrows twitched and she pouted. "Ahh, why did you guys… I told you not to open it. Moh…"
Tanjiro could only laugh lightly when he looked inside.
"Hanako, Shigeru, Rokuta… Ha. Those clothes are way too big for you, haha."
His three younger siblings were already wearing the uniform and haori, playing around in them even though the sizes swallowed them whole.
They gave him cute, awkward smiles—their ultimate trump card.
Takeo sat on the floor with a sulky face. "Uh, I tried to stop them, but they didn't listen. It was three against one, alright. Not my fault…"
Hearing that, even Nezuko had to cover her mouth and giggle.
"Wow, your haori is so beautiful, Tanjiro! Try wearing it~!" Kanae suddenly popped up from the ceiling and spoke loudly.
'I'm free anyway, might as well try it on…'
A minute later~
Everyone in the room sat with their mouths wide open, staring at Tanjiro the moment he stepped back inside.
He wore the black full-sleeved uniform with gold buttons and the large "Destroy" kanji etched boldly on the back. The pants were black too, cinched with a white-and-gold belt. The haori was the real eye-catcher: white base with flowing orange flame-like patterns. On the back, beautiful, overbearing strokes formed the kanji for "Sun Hashira." His Nichirin sword rested at his belt.
'What good fabric… it's stretchable and so comfortable…' Tanjiro smiled in approval.
He looked ahead at the sweet, stunned reactions from his siblings and Kanae, then chuckled inwardly.
"So… how do I look?" he asked, pretending to be unsure.
As expected, the little ones couldn't hold back anymore and shouted like they were bursting to say it.
"SO GOOD!!" ×3
"Wahh! Onii-chan! So cool!!" Hanako jumped on him like a monkey.
'Onii-chan~' Nezuko blushed. "It's perfect~!"
Being praised like that, he ran a hand through his long hair and exhaled softly.
"I got it. Onii-chan's fabulous, all right." He gave an obvious, confident smile.
Kanae responded with a faint laugh. "Ha~ this Onee-san is more fabulous~!"
His lips twitched subconsciously. 'Does she really have to say that?'
....
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