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

The Demon Slayer Corps headquarters, infirmary.

"You mean the markings?" Tsugikuni Iwakatsu looked at his younger sister with surprise.

To be precise, it was the red marks on my younger sister's cheeks.

It actually does bear some resemblance to Yoriichi.

Yuko nodded slightly. "I almost died at the hands of the evil spirits back then, but it was the suddenly awakened markings that saved my life."

"From my understanding, it should be a skill that can only be mastered after the body has broken through its limits."

Ji Guoyan looked at Yu Zi in shock, completely baffled by her words.

Before Yuuko, both the Demon Slayer Corps and Iwakatsu considered the mark on Yoriichi's forehead as a birthmark.

Even now, Yuko has awakened her markings.

After a moment of silence, Yan Sheng clenched his fist: "You mean, to become stronger?"

"Well, although I don't know the principle behind it, I can clearly feel the improvement in my strength."

After resting for a few days, Yuko has recovered from her weakness and can clearly feel the changes in her body.

Yan Sheng suddenly stood up and gripped the hilt of his sword tightly: "Come with me to the training ground."

He wanted to verify this conjecture himself.

How could such an absurd thing happen?

The doctor standing nearby quickly said, "This won't do. Miss Yu Zi's body hasn't fully recovered yet."

"I feel better...cough cough." Yu Zi said with a smile, her serene expression changing slightly as she coughed twice.

The doctor sighed: "Your lungs have suffered severe frostbite, which cannot be completely cured with current medical technology. I imagine the use of breathing techniques will also be affected."

Yan Sheng frowned slightly: "What's going on?"

Yu Zi shook her head: "I was just tricked by that evil spirit."

Those who awaken their markings will not live past the age of twenty-five.

Knowing this fact, Yuko did not seem to care much about her lung disease.

Moreover, she was far better off than those swordsmen who died tragically at the hands of evil spirits as soon as they learned the breathing technique.

At least, she's still alive.

To survive on the battlefield is already incredibly lucky.

Seeing this, Yan Sheng decided not to force her any further. "Then you should rest and recuperate."

After saying that, he turned and left.

"Wait a minute." Yuko got up from her hospital bed.

The doctor hurriedly tried to help him up.

Yu Zi declined her offer, saying, "Doctor, you should be aware of my condition."

The doctor paused, then sighed: "I'll figure something out about the lung problem."

"Please try to avoid strenuous exercise."

"Thank you." Yu Zi smiled slightly, then turned to Yan Sheng and said, "Brother, let's go to the training ground."

Yan Sheng frowned as he looked at her, standing still without moving.

Yuko tilted her head: "What's wrong?"

After a long silence, Yan Sheng suddenly spoke, "...When did you become so gentle?"

For some reason, it gave him the feeling that a person's words are kind when they are about to die.

"..." A vein popped out on Yu Zi's forehead, and a deathly smile squeezed out of her mouth. "Oh, really? So, is my brother the type who gets upset if he's not scolded?"

"If you had said so earlier, Yuko could have been swearing at you all day long."

She herself got goosebumps from saying those words, but as long as she could disgust Yan Sheng, it would be a victory.

Yan Sheng ignored her this time and turned to leave the ward.

Tsugikuni Yuko took a deep breath.

calm down.

That damn jealous person, she's going to use a piece of clothing to bully the strong today!

The training ground that Iwakatsu mentioned was not the Demon Slayer Corps' training ground. It was a place that was frequently used, and Iwakatsu did not like being watched by people.

The training ground he mentioned refers to the back mountain of the Demon Slayer Corps.

The three siblings often practiced their sword skills there.

Upon arriving at the training ground, Yuko put down her Nichirin Blade and reached for the wooden sword that was lying to the side.

"Use a real knife."

Iwakatsu's voice interrupted her actions. Ikuko paused for a moment, then slowly drew her Nichirin Blade and stood opposite her brother.

Yuko slightly raised her eyes and looked at Iwakatsu, who had also drawn his Nichirin Blade.

"bring it on."

As soon as the words were spoken, two voices rang out simultaneously.

"Breath of the Moon - First Form - Dark Moon - Palace of the Night".

The two swords, moving at a speed too fast for ordinary people to see, clashed at this moment, and the blades emitted a crisp, mournful sound.

Iwakatsu's pupils contracted slightly, and his arm, which was supporting Ikuko's Nichirin Blade, trembled slightly.

He actually surpasses him in strength...

Men's bodies are naturally stronger than women's.

This is an undeniable fact.

This is also why Ikuko, even after becoming a member of the Demon Slayer Corps, still didn't have a high opinion of her.

He had sparred with Yuko before and had always easily defeated her, but he had never felt such immense pressure before.

She was still using a breathing technique that she wasn't good at.

It was as if they had been reborn.

"Breathing of the Moon - Second Form - Pearl Moon Dance!"

"Water Breathing - Fourth Form - Tide of Strike!"

Back and forth, all of Iwakatsu's attacks were blocked by Ikuko.

Is not only Yoriichi, but Ikuko also going to leave him behind?

Yan Sheng felt increasingly unwilling, and the Nichirin Blade he wielded became more and more chaotic and disorderly.

With her physical abilities greatly enhanced, Yuko calmly withstood the fierce attacks from her brother.

She wasn't stupid, even though she hadn't read the manga or learned much about Tsugikuni Iwakatsu.

But after twenty years of getting along, she had long since seen through Yan Shengshan's jealous nature.

He was constantly jealous of Yoriichi's talent. Or rather, he could accept the fact that he was inferior to others, but he just couldn't accept that the people who surpassed him were his own younger brother and sister.

Especially his own twin brother.

He was jealous of the talents belonging to his family.

"cough……"

The moment when Yuko's breathing became disordered due to her lung disease gave Iwakatsu a sliver of an opportunity.

"Breath of the Moon - Land Form - Everlasting Night, Lonely Moon - Abyss!"

Several rapid crescent-shaped slashes shot towards Yuko.

The greatest strength of Moon Breathing lies in the more refined crescent-shaped slashes that accompany its strikes.

It can easily cover a large area.

"Sigh~"

Yuko calmly adjusted her breathing, exhaling a faint white breath.

"Snow Breathing - First Form: Tornado!"

A white tornado, carrying a hint of chill, deflected all the incoming crescent moon's slashes.

Meanwhile, Iwakatsu, who had never witnessed the Breath of Snow before, was also caught off guard and swept into mid-air by Ikuko's sword.

"Snow Breathing?!" Iwakatsu, who had lost his balance in mid-air, was shocked.

Not just his strength, but even his self-created breathing technique... Doesn't this mean that Yuko's talent is exactly the same as his?

Even his own sister couldn't surpass him, so how could he possibly surpass that person!

The raging tornado kept pounding on Yan Sheng's body. After all, this was not a fight to the death, and Yu Zi was using the back of her sword.

The anxiety of defeat, coupled with the almost overwhelming jealousy, caused Yan Sheng's body temperature to rise continuously, and his pulse rate to increase rapidly.

"Breath of the Moon, Fifth Form: Lunar Calamity Vortex!"

Yan Sheng's body spun in mid-air, wielding his Nichirin Blade and creating a huge vortex of blades around him, deflecting the tornado.

When the two collide, they completely cancel each other out.