"Big brother, is the white-haired miss still unconscious?"
"Yeah, it's been almost two days now. There aren't any wounds on his body, so he probably went through some kind of shock—that's why he hasn't woken up yet. And Nezuko, he's a guy, not a girl!"
"Wait, what?? Σ(￣□￣lll) Are you serious, big brother?? But he looks exactly like a girl!" Nezuko glanced at the white-haired young man lying on the tatami mat—delicate features, long white hair, and an elegant white robe accented with crimson.
"I'm sure. I could tell by scent, and Mom found out when she was adjusting his clothes..." Tanjiro's face flushed red as he trailed off.
When he first saw this white-haired person, he'd thought it was a girl too. He'd even asked Nezuko to help wipe his face with a hot towel...
Wait. The realization hit him like a lightning bolt, and Tanjiro whipped around to face his sister. "Nezuko, when you were wiping his face with that hot towel earlier, you didn't... you didn't..."
Nezuko: "Didn't what?"
"You know... you didn't wipe anywhere else, right??"
Nezuko: "Anywhere else? No, I just wiped his face. Big brother, what other places are you talking about?" Her confusion was genuine at first, but then her mind caught up.
Other places? Besides his face, that would mean...
The moment she understood what her brother was implying, Nezuko's face turned beet red.
Even someone as innocent as Nezuko could figure out what he meant.
"Big brother, you're terrible!" Nezuko puffed out her cheeks indignantly, glaring at him.
"No, that's not—I didn't mean it like that! What I meant was—"
"Tanjiro, Nezuko, has the child woken up yet?"
Tanjiro and Nezuko: "Mother."
The person who entered was Kie Kamado, mother to the siblings.
Tanjiro: "Not yet, Mother. I think he experienced some kind of trauma, which is why he's still unconscious."
Nezuko: "Mother, big brother was being awful! He asked me if I'd..."
"If you'd what?" Kie asked.
"He asked if I'd... if I'd..." Nezuko's voice grew quieter and quieter. Just thinking about what her brother had implied made her too embarrassed to finish the sentence.
"Alright, Nezuko. Tanjiro didn't mean anything by it. Why don't you both go get ready—dinner will be ready soon." Kie gently patted Nezuko's head.
Nezuko: "Okay."
Tanjiro: "Understood."
...
"Where... am I?" Kaidō's eyes slowly opened as he sat up, taking in his surroundings. A wooden house, simple yet warm.
Something about this place felt strangely familiar, though he couldn't quite place why.
[Ding! Host, you're awake.]
"Who's there?? Who's talking to me??"
[Host, I am the Demon Slayer System. I exist within your consciousness. You can communicate with me mentally through your thoughts.]
"Demon Slayer System? You're... a system?" Understanding dawned on Kaidō instantly. He'd read plenty of web novels before—he knew systems were essentially golden fingers for transmigrators.
"Systems are standard equipment for anyone who crosses worlds, which means that I'm... wait a second!"
He immediately addressed the system mentally. "System, wasn't I already dead?"
[Correct, Host. You died on Earth. Your mother and adoptive sister have already held your funeral.]
"Then what's going on with this body? I feel perfectly fine."
[Because Host arrived via soul transmigration, this body was reconstructed by the system. However, it functions identically to a normal human body and requires training to strengthen. Your soul was weakened during the fusion process with your new body, which is why it took nearly two days to complete.]
[Additionally, the reconstructed body is identical to your original form from when you were alive.]
...
After spending some time communicating mentally, Kaidō finally understood what this [Demon Slayer System] was all about.
His soul had been transported here through an interdimensional gateway constructed by the system. This world was the Demon Slayer anime he'd watched countless times back when he was alive.
The Demon King Muzan Kibutsuji, who created demons to search for the Blue Spider Lily in his quest to become the perfect, ultimate being.
In a world overrun by demons, there existed an organization called the Demon Slayer Corps—an entity not officially recognized by the government, though they frequently collaborated behind the scenes.
The system had also created a new identity for Kaidō in this Demon Slayer world—Ryūjin Kaidō.
"Listen, System, couldn't you have given me a better surname? 'Ryūjin' sounds like something out of a bad edgelord fantasy."
[Ding! This name was selected based on games the host played while alive. If Host dislikes it, the system can modify it. Based on anime you've watched, such as your favorite character Kurumi Tokisaki, or Kasuga...]
"Stop, stop, stop! If you keep going, everyone's going to start making weird faces. Fine, Ryūjin Kaidō it is."
Yukimur—no, Ryūjin Kaidō—accepted the name without further argument.
System: ???
Kaidō: "...This feels weird."
[Host, you still have an unclaimed Beginner's Package. Would you like to claim it?]
"Beginner's Package? Yeah, claim it."
[Ding! Congratulations! Host has received: Body Enhancement Serum x1, Total Concentration Breathing: Constant, Dragon Breathing First Four Forms, and 100,000 Yen.]
The Body Enhancement Serum was self-explanatory—it strengthened the body, improving physical attributes and resilience.
Without hesitation, Kaidō drank the serum. A warm sensation spread through his body, a current of heat flowing through his abdomen. Within moments, he could feel power coursing through every fiber of his being.
Total Concentration Breathing: Constant was one of the prerequisites for becoming a Hashira. He hadn't expected to already possess the ability to maintain the breathing technique twenty-four hours a day.
"Dragon Breathing First Four Forms?" Kaidō examined the breathing technique's name.
Dragon Breathing, First Form: Dragon's Breath — Upon activation, dramatically enhances all attributes including attack speed, movement speed, attack power, and strength. The enhancement scales with the user's own capabilities.
Dragon Breathing, Second Form: Dragon Claw — Single-target attack. Leap into the air and strike downward with a vertical slash, tearing through the enemy like a dragon's claw.
Dragon Breathing, Third Form: Divine Dragon's Tail — A forward horizontal slash creating a wide fan-shaped area of effect, sweeping away all enemies in front like a dragon's tail.
Dragon Breathing, Fourth Form: Coiling Dragon — Use your weapon to guard defensively, creating a protective barrier centered on yourself, blocking attacks from all directions like a dragon coiled around a mountain.
Kaidō also discovered that the First Form could be stacked with the other forms, though he'd need to test it himself to understand the full effects.
"The system only released the first four forms. Looks like I'll have to develop the later forms on my own. Wonder what they'll be like?"
"As for the 100,000 yen, in this world that makes me practically a small-time tycoon—enough to change the circumstances of several families."
"Ah, you're awake! Father, Mother—the white-haired person woke up!" Nezuko called out to her parents.
Several children and two adults entered from outside. Though Kaidō had already confirmed certain things in his mind, seeing them in person still caught him off guard.
"You're awake, child. How are you feeling? Is there anywhere uncomfortable?" Kie Kamado asked gently.
"Big brother, you finally woke up!"
"Who are you people? Where am I?"
"My name is Kamado Tanjiro. This is my sister, Kamado Nezuko, along with Hanako, Takeo, Shigeru, and Rokuta. This is my father, Kamado Tanjuro, and this is my mother, Kamado Kie."
"My sister and I found you collapsed in the snow in the mountain forest, so we carried you back. You've been unconscious for nearly two days," Tanjiro explained.
"My name is... Ryūjin Kaidō. Thank you for saving me."
....
The MC is quite similar to Rimuru Tempest, except with white hair!
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~# Every 300 Power Stones = Bonus Chapter!
~# Add to Library!