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

Chapter 596 Ghostly Genius

Yoruichi stared at Ikuko silently with a gloomy expression. If she weren't so good-natured, she would have pinned this idiot to the ground and given him a good beating.

"Sister! Never mind, never mind!" Beside him, Yu Shiro desperately hugged his sister, his feet being dragged along and sliding.

"Come on, don't be angry." Yuko waved her hands. "Maybe it was just a coincidence?"

Yoruichi stopped in her tracks, her expression still unchanged: "A coincidence?"

“That’s right, it was just a coincidence.” Yu Zi smiled and held up one index finger. “Sometimes it happens by chance that it works, right?”

Ye looked at her expressionlessly.

"If you don't believe me, then try again." Yu Zi tilted her head with a troubled expression. "This time, it might not work."

Yoruichi remained expressionless.

Yuko bent her arm forward and looked intently ahead.

"Broken Path No. 31: Red Fire Cannon!"

Yuko gathered spiritual power in her palm, and a red fireball gradually expanded. Just as Yoruichi couldn't help but want to step forward and beat her up, the fireball that was about to take shape suddenly dissipated, emitting a few gray flames, as if it had suddenly gone silent.

Before Yoruichi could react, Ikuko remained in the same position and recited:

"Breaking Path No. 63: Thunder Roar Cannon!"

zizi~

A beam of golden lightning shot out from his palm, and a sharp thunderclap struck the still-unrepaired dojo wall, leaving a charred mark on it, with golden lightning sparks flying everywhere.

"Huh?" Yuko tilted her head and looked at Yoruichi. "You used it again by accident?"

"I'll kill you! I'll kill you, you smug bastard!" Yoruichi's face darkened, and he gritted his teeth in anger, wanting to kill Yuuko.

"Please calm down!!!" But with Yushiro holding her tightly, she could only rage helplessly.

Yuko looked at Yoruichi with amusement: "It doesn't seem that difficult."

"Sister Yuko!!!" Yushiro cried out, on the verge of tears.

If this continues, he won't be able to stop it.

Yoruichi's angry expression suddenly fell silent: "Seriously, I didn't even teach you this move, did I?!"

She had just finished teaching the incantation for Azure Flamefall!

Even if you can apply what you've learned to other situations, you can't just learn something you haven't learned before out of nowhere, right?

"Ah, you mean this?" Yuko looked at her with a smile. "Has Yoruichi forgotten?"

"Kisuke used this technique when he demonstrated it before."

"..."

You can remember what kind of monster it is after seeing it only once.

Yoruichi was completely numb.

This is a level 60 Demon Path!

Are you planning to do a level 90 chakra mage without chanting later?

Yoruichi knew that this idiot was definitely playing a trick on her, but she really didn't expect that he could use a high-level Kido directly after reading it once.

Although its power is much lower than that of a fully chanted Kido, the incantation-free technique is a high-level skill that only the most skilled Kido practitioners can master.

Describing it as a monster is absolutely right.

Yuko stepped forward, bent down, and winked at her with an innocent expression: "Maybe I just learn Hakudo faster. Yoruichi, why don't you try switching to Bindō or Reverting to a different style?"

Yoruichi uttered a single word with a dark expression.

"roll."

After saying that, she stormed off.

"Huh? Aren't you going to teach anymore?"

Ye Yi didn't even turn her head: "Go read the book yourself!"

"..."

“That’s true…” Yuko frowned. “Where am I supposed to find books about the Way of the Demon?”

Yushiro chuckled awkwardly, "Leave this to me."

"The Shihōin family's library contains materials related to Kidō (Buddhist arts). Although it would be quite troublesome to learn it on your own without a teacher, if it were Ikuko-nee..."

I feel like I'll understand it after watching it once.

Yuko suppressed her playful smile and smiled slightly at Yushiro: "Well, then I'll trouble you, Yushiro."

"No, it's alright." Xi Shilang's face was slightly flushed, but he was secretly thinking to himself.

Yuko is so charming when she's serious, I don't know why she always likes to tease her.

……

After passing through several corridors, the two arrived at a heavy sandalwood door. This was one of the core strongholds of the Shihouin family, a place dedicated to storing all kinds of books and scrolls except for the family's secret techniques, including the publicly published Kido teaching materials and research notes of the Gotei 13.

As Yushiro pushed open the door, a scent of ancient paper and ink mixed with the dust of time rushed towards him.

The interior space is far more magnificent than it appears from the outside. Rows of towering bookshelves stand like silent giants, densely displaying a vast array of scrolls and classics.

"Wow..." Yuko exclaimed sincerely.

To see if a family has authority, just look at its library.

This scene is no different from being in a library.

Indeed, even in a world where strength reigns supreme, knowledge remains of paramount importance.

"The books related to Kido are all on the right-hand bookshelf," Yushiro explained dutifully as he walked to the right. "Hado, Bakudo, and Kido are stacked separately, and each has been explained in detail."

Before he could finish speaking, Yuko had already picked up a scroll.

Yushiro promptly shut his mouth and quietly moved closer. He was actually curious about the extent to which Yuko-nee could do it.

You can't really learn it just by looking at it once, can you?

Practical training is definitely different from written instruction, right?

He initially studied the material by reading books, but he didn't grasp the key points at all. It was only after his sister practiced with him in real-world scenarios that he began to understand it.

"I see... The person who collected these Ghost Paths is indeed very meticulous, having provided detailed analyses of how each Ghost Path is used."

Yushiro nodded slightly: "That's right, this is the Shihouin family's summary of their understanding of Kido, which is generally not shown to outsiders."

"Is that so?" Yuko turned her head slightly and smiled at Yushiro. "Thank you."

"Thank you, Yuushirou and Yoruichi, for treating me like one of your own."

Yushiro's face flushed red, and he quickly waved his hands, "No, no need..."

"It was all my sister's idea."

Wow, Sister Ikuko is too...

Suddenly, just as Yushiro was feeling his heart pounding at Yuko's gentleness, Yuko abruptly said, "Hey, Yushiro, can I use you for an experiment?"

"Huh? That's possible..."

Before Yushiro could finish speaking, Yuko's cold voice rang out.

"Binding Path One: Blockage".

Before Yushiro could react, his arms were already tied behind his back, rendering him unable to move.

Yushiro blinked, looking completely bewildered. After a moment of stunned silence, he exclaimed in surprise, "Eh? Eh? What?!"

“I see, that’s how it’s constructed. Chanting incantations is to guide and stabilize the flow of spiritual energy, but if one can directly understand the trajectory of spiritual particles, the incantation itself becomes an unnecessary process.” Yuko muttered to herself as she flicked her fingers in the air, releasing the restraints on Yushiro.

Yushiro rubbed his slightly sore wrist and gave a wry smile: "That understanding is correct, but only a Shinigami who is proficient in the way of demons can do it."

Yuko glanced sideways: "Are there very few Shinigami who can activate Kido without chanting?"

Xi Shilang's lips twitched: "If it weren't for the fact that you, Yu Zi-jie, have never teased me before, I would have suspected that you were doing it on purpose."

Yu Zi paused for a moment, then smiled slightly: "Who knows?"

Yushiro blushed and coughed lightly: "The higher the number of the Demon Path, the higher the difficulty."

“If it’s just a matter of abandoning the incantation in low-level demonic arts, then my sister can do that too.”

"But if it's a high-level ghost path, I guess only a ghost path master who is proficient in ghost path can do it."

Yuko nodded slightly: "It seems that both the Demonic Path and the Binding Path are based on the user's spiritual pressure."

"If the spiritual pressure level is high enough, even a low-level Kido can unleash considerable power. Conversely, if the spiritual pressure level is too low, the power of the Kido will be greatly reduced."

The same applies to the bondage method.

The greater the difference in spiritual pressure levels between the enemy and our side, the more pronounced the effect.

Yushiro nodded seriously: "That's natural. Kido is essentially a means of mobilizing spiritual power for combat, so it's naturally inseparable from the spiritual pressure of Shinigami."

“It’s an ability that can only be used as a supplementary means,” Yuko thought to herself.

The reason is simple: it's too slow to start.

Unless someone else helps to fend off the enemy, it's difficult to have any room to maneuver.

If she were to encounter someone as mobile as Yoruichi, perhaps only a Kido that abandons incantations could pose a threat to her.

However, if the incantation is abandoned, the power of the demonic path is difficult to maintain its original form, and it is still hard to say whether it can pose a threat.

but……

With such outstanding support abilities, there's no reason for her not to learn them.

Yuko extended her index finger, and a small ball of soft green light gathered at the tip, radiating a warm and healing aura.

"This is... a return journey."

Yu Zi nodded gently: "Yes, I didn't expect that learning the Dao would be more complicated, because it requires controlling spiritual particles to heal."

Xi Shilang's eyelids twitched; he really couldn't see what was so complicated about it.

Isn't this something you can learn at a glance?

“Yushiro, can…” Yuko glanced at Yushiro instinctively, then paused, “It’s nothing.”

Before Yushiro could react, Yuko's fingernails extended slightly, scratching a bloody mark on her arm.

"Ah!" Yushiro exclaimed in surprise.

Without changing her expression, Yu Zi suspended the green orb of light over the wound. Warm spiritual energy seeped into it, and the bloodstain healed rapidly at a speed visible to the naked eye. In just a few seconds, her skin was restored to its original smoothness, without even a trace of a scar.

"Hmm, the effect is good." Yu Zi nodded in satisfaction. "Although my body can recover on its own, the basic healing method of returning to the source can actually reduce the loss of physical strength."

In terms of treatment intensity alone, the back channel can only be used for emergency situations and to treat some minor injuries.

More serious injuries are not so easy to heal.

Yushiro looked at Yuko with a hesitant expression, as if he wanted to say something but hesitated.

Ahhhhh! !! !!

He's really being driven crazy!

Where did Sister Yuzi come from? Who is she? Why can her body self-repair? Why can she see through the structure of spirits? Why can her fingernails grow longer?

But his sister had repeatedly told him to pretend he hadn't seen it and not to tell her the secret.

It made Yushiro feel like he was about to become jade.

"Yushiro, can I use you to experiment again?" Yuko asked, and seeing that Yushiro had nothing to say, "I'll take that as a yes."

"Ah? What…"

“Binding Spell Number Sixty-One: Six-Staff Light Prison.” Ikuko looked at the six light plates sandwiched between Yushiro and nodded slightly. “This is the binding spell that trapped me back then.”

"I feel that even without the singing effect, it is still much better than that old man's."

Pure spiritual pressure suppression.

Yushiro stood there, his face blank.

"Yushiro, would you like to try breaking through?"

Yushiro looked troubled: "As for here..."

"Oh, sorry, I forgot." Yu Zi lowered her eyelids slightly. "I'll let you out right away."

Just then, a lazy voice came in from the library door.

"How's it going, you genius young lady? Have you learned it?"

Yu Zi's eye twitched slightly: "I mean, can't you just use the same form of address for me?"

"Hmm? Well... idiot, moron, moron, which one do you pick?"

"I think the princess is quite nice."

"It's been so long, why are you still criticizing me like this..." Yoruichi came in from a corner of the library, about to retort, when she suddenly saw Yushiro, who was frozen in place and unable to move.

“Sister.” Xi Shilang gave an awkward smile.

Yoruichi ground her teeth and said sourly, "You've already reached level sixty-one?"

"You really can't judge a monster like you using common sense."

"Please stick to how you address me. I'll allow you to call me Princess..."

Yoruichi raised her hands in surrender: "Yes, yes, Your Highness~"

Yu Zi's expression changed slightly.

Yoruichi narrowed her eyes slightly: "Speaking of which, Your Highness, what have you done to my dear brother?"

"Uh, well, I think you can just call me by my normal name."

"Hmm? Why, Your Highness?" Yoru's gaze held a playful expression. "Didn't Your Highness tell me to call you that?"

"Don't hold a grudge like that." Yu Zi's lips twitched; this guy really reacted quickly.

Yoruichi rolled her eyes: "You idiot, how dare you say others hold grudges?"

"Who started this trouble first?"

"...It's me, I'm sorry."

"Humph!"

Yushiro couldn't help but speak up: "Gentlemen, could you please release me first?"

"You can't possibly be unable to escape even this level of binding spell?" Yoruichi asked, crossing her arms as she looked at Yushiro.

"What level is this?" Yushiro muttered to himself, "This is the binding spell used by Yuko-nee."

Yoruichi clicked her tongue in annoyance. What do you mean by "this is..."?

It's as if Yuko's Kido is really powerful.

Seeing his sister's reaction, Yushiro's heart suddenly tightened.

Oh no, I think I accidentally said something wrong.

"Your task today is to walk out of the library on your own." Yoruichi crossed her arms. "I don't care if you crack the code, escape, or destroy it."

"Huh? Wait! I haven't finished reading yet!"

"What a hassle! Which books? I'll help you move them out so you can read them at your leisure."

"Huh? What about Yuushirou?"

"Let him fend for himself here."

Without giving Yushiro any room to plead, Yoruichi pulled Ikuko away.