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

Perhaps it was the hope of catching up with Yoriichi, or perhaps it was Ikuko's courageous sword-wielding in the mountains, that made Iwakatsu's attitude towards his younger sister much better.

Yan Sheng tilted his head: "I didn't say I wouldn't teach, did I?"

Yu Zi's face lit up with joy: "I knew you were reliable, brother."

"hehe."

Following the Breath of the Sun, Ikuko began training in the Breath of the Moon under Iwakatsu's guidance.

Moon Breathing is derived from Sun Breathing, but it is more powerful than the Five Great Breathing Techniques and is known as the Initial Breathing Technique along with Sun Breathing.

Even though many people believe that the Breath of the Moon is not worthy of this title.

While the Breath of the Moon is not as difficult to master as the Breath of the Sun, it still excludes ordinary people.

Fortunately, Yuko was not among them.

Under the personal instruction of the founder of Moon Breathing, Yuko made rapid progress and soon mastered Moon Breathing.

but……

After watching Yuko finish a set of Moon Breathing sword techniques, Iwakatsu shook his head and said, "You are not suited for Moon Breathing."

"Whoo~"

Yuko, slowing her breathing, sheathed her katana and did not refute Iwakatsu's words.

She knows her own situation best; she is indeed not suited for Moon Breathing.

It's not that it's unusable, but in terms of its upper limit, it certainly can't reach the pinnacle of skill like Iwakatsu.

Just like how Tanjiro's talent for using Water Breathing is not as good as Giyu Tomioka's.

What suits you is the best.

"It might be more hopeful to mess with your Star Breathing than to fight the Moon Breathing technique to the death."

"I have nothing more to teach you."

Yuko was speechless.

Star Breathing?

She hasn't even created the folder yet!

“Brother, Yuko.”

At that moment, Yoriichi approached the two, carrying two Nichirin swords wrapped in white cloth.

"Your Nichirin Blade is complete."

This method, compared to later generations where one had to complete a trial to master the breathing technique in order to become a member of the Demon Slayer Corps, was different.

Before Yoriichi arrived, the Demon Slayer Corps of this era used pure swordsmanship, employing Nichirin Blades to decapitate demons.

The casualty rate was extremely high.

Therefore, the Demon Slayer Corps is always short of manpower.

Although things are much better now, there is still a general shortage of manpower.

As long as you learn the breathing technique, you can go out and kill demons. There is no longer the rule in later generations that requires you to go through trials to select elites.

"Is it finally finished?" Iwakatsu eagerly picked up his own Nichirin Blade.

He drew the blade, and the sword visibly turned a pale purple.

Yoriichi praised, "What a unique color. There isn't a Nichirin Blade of this color in the Demon Slayer Corps."

Yuko also picked up her Nichirin Blade out of curiosity.

She didn't have many requirements regarding the style of the Nichirin sword; the tsuba, hilt, and even the scabbard were all very simple.

Clang!

As the Nichirin Blade was drawn, Ikuko eagerly awaited its color change.

The sound of the sword being drawn attracted the attention of the two elder brothers.

A pure white hue slowly rose to the tip of the knife.

That was the color of snow.

As if snowflakes were drifting through Yoriichi's eyes, he smiled slightly and praised, "What a beautiful color, it's just like snow."

"really."

Yan Sheng, usually a jealous person, also chimed in with a rare comment.

“Even a white Nichirin Blade of this purity has never been…” Yoriichi paused, tilting his head and looking at Ikuko with a slightly puzzled expression.

Yuko held the sword horizontally, pressed her left hand against her right wrist, and shouted, "Bankai! Hakuka Punishment!"

Iwakatsu and Yoriichi: "..."

Swoosh...

A gust of wind blew.

Yu Zi coughed lightly and gave an awkward smile: "Just kidding."

The moment I saw the color of the Nichirin Blade, I understood.

It turned out to be the case.

Yoriichi's Nichirin Blade is black, while hers is white—completely opposite colors. No wonder she doesn't have the talent to use the Breath of the Sun.

Yoriichi, who was momentarily stunned by Yuuko's inexplicable actions, came to his senses and said, "I think a pure white blade would be more suitable for Water Breathing or Wind Breathing."

Yu Zi nodded slightly; she thought so too.

Yoriichi himself was the founder of the breathing techniques, so it was no problem to ask him for guidance on the five major breathing techniques. However, Yoriichi was often away on missions and could not always teach her.

Yuko had no choice but to visit the pillars of the present day.

After creating Moon Breathing, the exceptionally talented Iwakatsu quickly became a pillar of the team, rapidly becoming the second strongest member of the Demon Slayer Corps after Yoriichi.

Only Yuko is still searching for a breathing method that suits her.

Sun Breathing is considered the pinnacle of all techniques, but unfortunately, Yuko cannot use it. Forcing herself to use the breathing technique is not impossible, but her body would be the first to fail.

While Moon Breathing is usable, its compatibility is still somewhat lacking.

After becoming a member of the Demon Slayer Corps, Ikuko inevitably received missions to go out into the world.

Fortunately, during this period, most of the ghosts and monsters were not as powerful as they would be in later generations, and the Twelve Demon Moons had not yet been established.

As long as she doesn't run into a scumbag boss, Yu Zi still has the ability to protect herself.

In her spare time, she visited the swordsmen of the Demon Slayer Corps who used the five breathing techniques: water, fire, lightning, wind, and rock.

The order was based on her preferences.

Originally, Flame Breathing should have been ranked third. As the breathing technique with the closest special effects to Sun Breathing, Yuko prefers this one compared to other breathing techniques.

However, judging from the color of her blade, she might be more suited to the Water Breathing technique, which is why she postponed learning the Flame Breathing technique.

Among them, the Rock Breathing technique is characterized by its user's use of heavy two-handed weapons. Yuuko cannot use it because she has only learned the breathing technique and has only a slight understanding of sword forms.

Unexpectedly, Yu Zijun showed remarkable talent in learning the five breathing techniques, and this was the first time she felt that she was not being ostracized by the two brothers.

She! Ikuko Tsugikuni!

A natural-born genius!

This is partly due to the fact that the various breathing techniques and sword forms are not yet fully developed.

Compared to the sword forms of later generations that frequently reach the ninth or tenth form, the five major breathing techniques of today only have a handful of sword forms.

Yuko is well-suited to all five breathing techniques, but if one had to rank them, Water Breathing and Wind Breathing would be superior.

Yuko also focused on practicing these two breathing techniques.

Two years had passed by the time he mastered the five breathing techniques.

That year, Yuko was twenty years old, and the brothers Jiguo were twenty-one.

Yoriichi and Kokushima have firmly established themselves as the two strongest members of the Demon Slayer Corps and frequently go out on missions.

Having deeply analyzed the principles of breathing techniques, Yuko began to try to integrate water and wind breathing to create her own unique breathing method.

That day, Yuko was adjusting her breathing in the corridor.

A clear female voice suddenly rang out, "Yuko! There are evil spirits lurking in the mountains to the west. Please go and subdue them as soon as possible."

Yuko looked up.

The kasuri-jaku circling in the sky is called Suzujaku, and it was assigned to Ikuko after she became a member of the Demon Slayer Corps.

Upon receiving the mission notification, Yuko sheathed her Nichirin Blade, packed her things, and set off.