Demon Slayer: The Journey That Began When I Became Yoriichi's Sister

Because Tamayo needed to treat Yae's father, Ikuko also temporarily stayed at the Butterfly Mansion.

The Butterfly Sisters, as the owners of the Butterfly Mansion, are the medical unit of the Demon Slayer Corps, but Shinobu Kocho is the one who is truly in charge of managing the Butterfly Mansion.

Because Ikuko changed history, the Taisho Nine Pillars have now become ten.

Although they are sisters, Shinobu Kocho did not inherit the same talents as her older sister, or even her height.

The talent bestowed upon her by heaven seems to have been completely absorbed by Kanae, and her talent ranks among the top of the Pillars.

Therefore, most of them were used as a fighting force to fight evil spirits all year round.

Shinobu Kocho, on the other hand, was the complete opposite; she was short and lacked talent.

As a result of her promotion to Pillar, Kagaya Ubuyashiki entrusted her with the important task of taking over the management of the Butterfly Mansion from her older sister.

But Shinobu Kocho knew very well that this was because she was too weak.

Although Kanae was very happy that her sister was spared danger, Shinobu Kocho couldn't accept it.

……

The night was hazy, and the cold moon hung high in the sky.

In the courtyard in front of the Butterfly Mansion, Shinobu Kocho and Ikuko stood facing each other.

Shinobu Kocho slowly drew her peculiar blade: "Yuko, please don't worry. I want to awaken my Demon Slayer Mark as soon as possible. Please push me to my limit."

Unable to resist Shinobu's eagerness to become stronger, Ikuko had no choice but to accept her request.

After all, she's been eating and drinking here for free for a month.

Yes, that includes eating.

The daily expenses of Tamayo, Ikuko, and Yushiro, the three demons, were all covered by Ubuyashiki.

The blood was also provided by the Demon Slayer Corps swordsmen.

This is the Butterfly House, so collecting blood is quite convenient here.

Because of Tamayo's words, Ikuko was no longer so resistant, and her body felt more comfortable than ever before.

Yuko nodded and said, "Shinobu, don't worry about hurting me. I have overcome the sunlight, and the Nichirin Blade can no longer cause me any real damage."

Yuko didn't actually overcome her neck weakness, but she directly overcame the sunlight.

Demons fear being beheaded by the Nichirin Blade, but Yuuko, who has overcome the sunlight, will not die even if she is beheaded.

As for the toxins in wisteria flowers, it's not that she underestimated them.

Yuko had also learned about Shinobu's weapons during this time. The poison hidden in the blades was so potent that even ten times the dose wouldn't harm her.

She herself always carries a wisteria sachet with her, so she is very experienced.

Shinobu Kocho nodded earnestly: "I understand."

Yuko untied her Nichirin Blade and placed it in the corridor. "Well then, to make you feel more immersed in the experience, I'll give you a more direct experience."

Just as Shinobu Kocho was wondering what she meant by those words, she saw Ikuko's long red hair, which was flying in the cold wind, turn white in an instant, and two hideous demon horns grow from the top of her head.

At this moment, the crimson double pupils transformed into golden vertical pupils, captivating the soul from afar.

It wasn't over yet. Yuko clenched her right hand into her left palm and pulled a blood-stained demon blade from her hand.

With a casual flourish of his sword, blood splattered across the ground, revealing the original snow-white appearance of the demon blade, now soaked in blood.

Not a drop of blood was left on the snow-white blade.

In the corridor, the onlookers felt a sudden pang of fear.

Tamayo stared wide-eyed at Ikuko, for this was the first time she had ever seen Ikuko in her fully demonized form.

This sense of oppression likely stems from the fact that Yuuko's brother injected a sufficient amount of Muzan's blood into her body.

Tamayo had no doubt that the swordsman and Yuuko's brother, Upper Moon One who had remained unchanged for hundreds of years, would not even have this much face in front of Muzan.

But at the same time, she was also thinking about how Yuko looked after she turned into a demon.

It really doesn't look like a ghost...

Putting aside the bloody scene from just now, we are now bathed in moonlight.

That posture... was so sacred.

This was how the people in the corridor perceived Yuko, but Shinobu Kocho, who was face to face with her, felt it was completely different.

At this moment, Shinobu Kocho had no time to pay attention to Ikuko's appearance. The indescribable sense of oppression that Ikuko felt after she turned into a demon was like a mountain pressing down on Shinobu's chest, making it difficult for her to breathe.

Shinobu's body trembled slightly, and even the hand holding the knife shook uncontrollably like a leaf.

She is afraid.

She knew perfectly well that the other person wouldn't hurt her.

But she was afraid; her body's instinct was fear, and fear was her enemy.

This is the Upper Moon they will face, the strongest of the Twelve Demon Moons.

Was my sister fighting against this kind of monster back then?

In the corridor, Kanzaki Aoi noticed Shinobu Kocho trembling all over and was somewhat puzzled.

Miss Shinobu, what's wrong?

Under Ikuko's deliberate pressure, Shinobu's mind was on the verge of collapse.

Within seconds, Shinobu Kocho was drenched in sweat and lost control of her body.

Get moving...

Shinobu bit her lip until it bled, but her willpower successfully suppressed the fear in her heart.

Shinobu Kocho was overjoyed to realize that she had regained control of her body. She lowered her light body slightly and shot out like a sharp arrow.

"Insect Breathing, Bee Fang Dance, True Dance!"

As the Pillar with the fastest thrusting speed, Shinobu Kocho's figure was so fast that the people in the corridor could hardly see her.

however……

Yuko calmly gazed at the petite figure, who seemed to be drawn to a flame like a moth, and slowly extended her arm.

To Shinobu's astonishment, Ikuko grabbed her slender blade as it lunged forward, and then a tremendous force hurled Shinobu high into the air.

The immense force nearly caused her to drop the hilt of the knife.

Shinobu Kocho gritted her teeth as she forcefully twisted her body in mid-air, and fell gracefully like a butterfly. The moment she landed, she was launched like a cannonball.

"Insect Breathing, Dragonfly Dance, Hexagonal Compound Eyes!"

Because her strength was too weak, Shinobu Kocho mostly used thrusting swords to inject the poison hidden in the blade into the demon's body in order to eliminate the opponent.

However, just as the first of the six strikes was about to hit Yuko, a flash of silver light appeared.

Butterfly felt a sharp pain in her wrist as the blade was instantly knocked away.

Before she could react, a dark shadow loomed over her. Shinobu instinctively looked up, her pupils suddenly contracting.

He met those captivating, golden vertical pupils.

Yuko raised her long sword high, the snow-white blade reflecting the bright moonlight, and slashed straight at her.

To die.

Shinobu Kocho completely forgot their plan at this moment, and stood frozen in place, like a lamb to the slaughter.

The snow-white blade stopped before her eyes, and the gust of wind it generated seemed to tear her cheek apart.

Yuko sheathed her sword and deactivated her demon form.

The imposing aura of the powerful woman crumbled instantly. With the pressure released, Shinobu's legs went weak, and she knelt down in front of Ikuko.

Shinobu Kocho knelt on the ground, panting heavily. She couldn't tell if the sweat was tears or sweat, as it dripped onto the back of her hand.

She's too weak...

In this situation... let alone fighting, they're just a complete liability.

“Ren…” Kanzaki Aoi subconsciously stepped forward but was stopped by Tamayo.

Tamayo shook her head, indicating that everyone should leave first, and that the two of them should take care of things here.

The group quietly left.

Yuko squatted down and held out her hand: "Ren, get up first."

Shinobu's lips trembled slightly. She reached out and was helped up by Yuko. She hugged her arm with one hand, lowered her head, and made a sound that was almost a sob.

"It's embarrassing, isn't it..."

He inexplicably brought up wanting to awaken his markings and arrogantly demanded that Yuuko train with him...

As a result, he couldn't even keep his composure in front of Yuko.