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

Yuko lowered her eyelids slightly and picked up the Nichirin Blade that Shinobu had stuck in the ground.

"Here, let's continue." Yuko handed the hilt of the knife back.

"I'm a ghost who's lived for hundreds of years. If I can't even beat an eighteen-year-old girl, that would be shameful."

That's what they say, but...

Shinobu looked down at her still trembling hands. She knew the gap would be huge, but she never imagined she would lose even the courage to fight.

"I'm too weak..." Shinobu Kocho seemed to have lost her resolve.

"Is Ren underestimating me?"

"Huh? No." Butterfly was startled and quickly shook her head.

Yuko said seriously, "Before I awaken my mark, even if all the Pillars joined forces, they would definitely not be my match."

This is the result of her judgment based on Giyu Tomioka as the standard for a Pillar.

They went all out from the start, and they wouldn't have any chance to fight back.

Even if there is someone stronger than Giyu among the Pillars, she cannot possibly lose.

Unless another Yoriichi is born in this era, but judging from the development of the story, it seems that no one will be.

She was immune to sunlight and the Nichirin Blade. Before the Pillars exhausted her strength, Ikuko was absolutely confident that she could defeat everyone.

All pillars...

Shinobu Kocho opened her mouth: "Are all Upper Moons as strong as Ikuko?"

“How could that be?” Yuko shook her head. “There is a huge difference between even the highest level.”

Just like Doma, Upper Moon Two, but in Yuuko's eyes at the time, he wasn't necessarily that powerful; she just wasn't confident that she could keep him in her human form.

If his strength is only what it was when he fought Yuuko back then, after he develops a medicine to prevent the cold poison, then his threat level to the Demon Slayer Corps will be just so-so.

Moreover, that guy looks like a slut.

There has never been only one true monster among the Upper Moons.

To give Shinobu Kocho a clearer understanding of the Twelve Demon Moons' combat strength, Ikuko stated directly, "The current Upper Moon One is my older brother."

"After becoming the Upper Moon, he held the position of the top Upper Moon leader for hundreds of years without being shaken."

"He is the strongest demon, second only to Muzan."

Shinobu Kocho's eyes widened slightly as she recalled what Ikuko had said before: "Ikuko was... by him..."

"Ah."

“I don’t think I’ve given you a proper introduction yet.” Yuko suddenly remembered, “I am the swordsman who started breathing in the Sengoku period, and the younger sister of Yoriichi Tsugikuni.”

"Ikuko Tsukuni."

Shinobu Kocho's pupils trembled, and her breath hitched: "The swordsman who initiated the breathing technique, is Upper Moon One?"

“Hmm.” Yuko nodded at first, then realized that Shinobu might have misunderstood, and quickly corrected her, “No, it’s not…”

“I have two older brothers, one of whom is…”

Yuko spent some time explaining her identity to Shinobu Kocho.

……

"In short, just treat me as Upper Moon One, and I don't think I'll lose to him."

Shinobu Kocho was still reeling from Ikuko's experience, utterly shocked: "I never imagined that the swordsman who created the Initial Breathing Technique would willingly become a demon..."

That's not wrong; the Breath of the Moon is indeed the starting breath.

Shinobu looked up at the sky, her eyes slightly closed: "Let's continue, Yuuko."

Yuko smiled and said, "Yes."

"Should I proceed step by step?"

Shinobu took a deep breath and opened her eyes: "No, please do it the way you just did."

"Well."

Complete demon transformation is actually quite physically demanding, but this level of training barely affects Yuuko.

When Yuko once again revealed her full demonic form, an indescribable aura instantly swept over everything, like a giant wave surging into the sea.

Butterfly gritted her teeth, her trembling hands gripping the Nichirin Blade tightly, constantly trying to adjust her mindset.

Ultimately, a sense of momentum isn't about real pressure; it's about overcoming inner fear...

But this is often the most difficult thing to overcome.

Physical ailments can be treated with medication, but worries cannot.

Shinobu Kocho looked as if she had just been pulled out of the water, and before any fighting had even begun, she was already soaked to the bone.

Fortunately, Shinobu Kocho is no ordinary person. As a swordsman of the Demon Slayer Corps and a Pillar, she also has the courage to disregard life and death.

With her efforts to calm herself down, the trembling in her hands gradually stopped, and the heavy pressure in her heart also dissipated considerably.

"Hoo~" Her rapid breathing gradually calmed down, and Shinobu looked up at Ikuko in front of her.

Only then was she able to calm down and observe Yuko.

……

So beautiful.

A pale silver moon hung in the sky behind Yuko, its light spilling down and illuminating her long, snow-white hair, which, combined with her golden eyes, gave her an air of holiness.

Yu Zi tilted her head slightly, a hint of doubt in her eyes: "Ren?"

Why don't you call back?

"what?"

Shinobu Kocho let out a cute scream, her face flushing red, as if she had been caught peeping at someone and was quite embarrassed.

Yuko was somewhat surprised. In her vision, Shinobu's tense muscles had greatly relaxed.

Did they withstand her momentum?

Moreover, my heart rate increased.

As expected of a Pillar, awakening the markings shouldn't be too difficult.

"Then, Ren, be careful."

Yuko straightened up slightly, and suddenly exhaled a white breath.

Shinobu Kocho, who was initially a little embarrassed, narrowed her pupils. This breathing technique... it's her sister's Snow Breathing!

Yuko drew the Shura sword, swinging it in a snow-white arc in mid-air. She leaned back, raising the sword to shoulder level, and then a red light flashed from the tip of the blade.

"Snow Breathing - Eleventh Form - Red Furnace Lights Snow".

The Eleventh Form?!

A cool, clear voice entered Shinobu's ears. It was true that Ikuko had come into contact with the Master as the successor of the Snow Breathing technique.

Snow Breathing is said to have been passed down from the Warring States period along with the five basic breathing techniques. Could it be that Yuuko is snow...?

Before Shinobu could think, a red and white flame rapidly enlarged before her eyes.

In a moment of desperation, Butterfly Shinobu retreated swiftly, her body fluttering like a butterfly.

There is no doubt that Yuko is letting the game slide.

Rather than letting Shinobu Kocho directly experience the difference in skill, pushing her to the brink little by little is more likely to push her to her limit.

But while she was letting loose, she was also practicing her new sword technique.

Sun Breathing is ultimately the most effective breathing technique for suppressing demons. Unable to fully utilize Sun Breathing, Yuuko, who decided to stick with Snow Breathing, came up with a compromise.

Just like the Ninth Form: Blazing Snow, by combining Snow Breathing with Sun Breathing, you can neutralize the negative effects of Sun Breathing and effectively enhance your ability to control regeneration.

Although it's not as effective as pure Sun Breathing, it's at least suitable for her.