Demon Slayer: Strength Gained with Every Swing of the Sword

"Well, let's first take a good look at where we are..."

Feng Yu stood up and opened the door.

The moment the door opened, a wave of floral fragrance filled the air, and butterflies danced in the garden.

Just as Feng Yu was admiring the beautiful scene, a girl's voice called from behind.

"You're awake!"

Feng Yu turned toward the voice.

It was three girls in white clothes with black hair, each wearing a different colored hairpin.

"Hello, I'm Kiyo Terauchi," said the girl with a light pink hairpin.

Next, the girl with a light blue hairpin, Sumi Nakahara, and the girl with a green hairpin, Naho Takada, introduced themselves.

"I'm Nakagawa Feng Yu. Can you tell me where I am?"

Feng Yu looked at the three girls in front of him, feeling an odd sense of familiarity but couldn't quite remember why.

"Feng Yu, this place is called Butterfly Mansion. It's been seven days since you arrived here, including today," Kiyo Terauchi counted on her fingers.

"That means I've been unconscious for seven days?" Feng Yu frowned.

This was the first time he had been unconscious for so long. No matter how severe his injuries were, he always recovered by the next day, not because of anything special, but because he had great confidence in his body's ability to heal.

But hearing that he had been unconscious for seven days, he couldn't help but feel somewhat doubtful.

"It was Lord Shinobu who brought you here!" Kiyo Terauchi seemed to notice Feng Yu's confusion and continued, "When Lord Shinobu brought you here, you were covered in blood and wounds. It was Lord Shinobu who kept treating you, though we also helped, hahaha."

"We're so glad you woke up!"

The three girls laughed happily.

"We need to tell Lord Shinobu about this!"

Then they ran off, leaving Feng Yu standing there, dumbfounded.

"These..." Feng Yu thought, looking at the three girls. They seemed a bit older than what he remembered, probably because they were still young children at this point in the story...

Thinking about it, he realized that the main plot hadn't even started yet. There was still over a year before everything kicked off. These three girls were probably still in their childlike phases...

Feng Yu shook his head and decided not to think too much about it. He began to stroll around Butterfly Mansion.

"Honestly, this place is really great to live in..."

Looking at the clean and tidy houses, the variety of flowers and plants, and the butterflies flying around, Feng Yu noticed the workers of Butterfly Mansion busily going about their tasks, each one working with precision.

Feng Yu wandered around, holding his little white fox and admiring the scenery.

At that moment, Feng Yu stopped.

"Heh ha~"

A girl wearing a green butterfly-shaped hairpin with a pink edge was swinging a wooden sword.

Surrounded by butterflies, it seemed like they were accompanying the girl as she practiced.

"Is this... Kanao Tsuyuri?" Feng Yu thought. Only two years apart, yet the characters in the original story had changed so much.

The girl practicing seemed to notice Feng Yu's presence and paused. Her lavender eyes quietly looked at him.

"Just as I thought, a quiet girl..." Feng Yu sighed. Although her appearance didn't fully match the character, her personality was still the same.

"The hairpin must be a memorial for Shinobu Kocho's sister, Kanae..."

Feng Yu recalled the anime from his past life, which included the stories of Shinobu Kocho, Kanae, and the girl in front of him, Kanao.

"Such a pity... her unfortunate childhood, and with Kanae's tragic death, this is how she became..." Feng Yu thought. After a moment, he decided not to disturb her practice and left.

Not long after Feng Yu left, he was called out.

A girl with a deep blue hairpin, Aoi Kanzaki, shouted angrily, "How dare you wander around like this! Don't you know you're still in recovery? You can't be walking around! Come back with me!"

"Wait... is this... an education session?" Feng Yu blinked in surprise before being led away by Aoi Kanzaki.

"Lie down and don't move. Lord Shinobu will be back soon."

Aoi Kanzaki turned to the three girls behind her and said, "You stay here and watch him. Don't let him run off!"

"Yes..." The three girls answered obediently.

Aoi Kanzaki left, leaving the three girls and Feng Yu alone in the room.

"I tell you... I'm fine now... Look..." Feng Yu stood up and even jumped a few times.

"So stop looking at me like I'm a prisoner..." Feng Yu felt uncomfortable under the girls' gaze.

"No, Aoi Kanzaki said we have to watch you..."

The three girls stood firm in their task, unaffected by Feng Yu's words.

"Ugh... You guys..." Feng Yu sighed. He was certain his body was completely recovered, and he didn't need any treatment. In fact, he felt stronger than before the coma.

He guessed that his strength might be due to the Body Strengthening Technique, which required external stimuli to grow stronger.

The three girls kept staring at him. Their big eyes gave him a strange feeling... oddly cute...

Of course, Feng Yu also felt a little nervous, because from their words, it seemed that the legendary Shinobu Kocho was coming soon...

At that moment, the door opened.

"Moshi Moshi, Feng Yu-kun, it's so good you're awake!"

The door opened, and Feng Yu once again heard a voice from before he fell unconscious.

"Hm?"

Feng Yu looked up to see a girl with violet eyes, wearing a butterfly-patterned cloak, and smiling as she greeted him.

"Shinobu Kocho?"

Feng Yu momentarily lost focus. He never expected to meet the incredibly popular Shinobu Kocho in such a situation.

"Moshi Moshi? Feng Yu-kun, it seems you know me?"

Shinobu Kocho approached him, waving her hand and smiling.

"Ah... well... no... never met..."

Feng Yu, surprised by her proximity, suddenly felt a little flustered.

"Feng Yu-kun, you're such a cute boy..." Shinobu Kocho laughed at the sight of his red face.

"Your little white fox is so adorable..."

At that moment, Feng Yu realized his little white fox had jumped into Shinobu Kocho's arms and was rubbing her hand affectionately.

"Little White... you white-eyed fox!"

Feng Yu was a little angry. He never expected his fox to abandon him and seek affection from Shinobu Kocho.

But despite the playful frustration, Feng Yu cleared his throat and regained his composure. "Thank you for saving me..."

"Feng Yu-kun, you're too kind. It's our job here at Butterfly Mansion. There's no need for thanks. On the contrary, we should thank you for risking your life to slay demons and protect others," Shinobu Kocho said while gently petting the white fox.

"But still, thank you for taking care of me these past few days..."

"But now that my body is fine, could you let me regain my freedom?" Feng Yu asked.

"Mm, Feng Yu-kun's body is in great shape, and your recovery is excellent," Shinobu Kocho said, looking at him with a thoughtful expression.

Her face suddenly grew serious.

"Feng Yu-kun, have you mastered two breathing techniques?"

"Eh? How did you know...?" Feng Yu exclaimed in surprise.

"I sensed two different breathing techniques when I found you," Shinobu Kocho explained. "Your body is unusual. Your self-healing ability is incredibly strong, and you're highly immune to poison. The reason you were unconscious for so long is because the two breathing techniques caused internal organ damage..."

"I see..." Feng Yu finally understood why he had been unconscious for so long.

"If you don't mind, Feng Yu-kun, could you demonstrate the operation of both breathing techniques for me later? You're the first person to possess two breathing techniques. If we can learn from you, our Demon Slayer Corps' strength could increase exponentially..."

"Please, Feng Yu-kun!"

Seeing the eager look in Shinobu Kocho's eyes, Feng Yu felt a little moved. He knew her story all too well.

"Alright!" Feng Yu agreed.

"Thank you, Feng Yu-kun..." Shinobu Kocho smiled gratefully. 

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