What Era Is It, Still Writing Traditional Diaries

To some extent, the author of that work likely drew inspiration from JoJo's Bizarre Adventure's Ripple Chi Kung, leading them to create breathing techniques within their own manga. It could be seen as a tribute to their predecessors.

Regarding those breathing techniques, although the story of Demon Slayer should have concluded in the last century, I investigated this during my first few years after transmigrating. Through some unofficial histories, I can infer that these breathing techniques most likely exist in this world.

However, there are still quite a few differences between breathing techniques and Ripple Chi Kung.

Unlike Ripple Chi Kung, where the longevity-extending effects become more pronounced in the later stages, Breathing techniques have a more singular function: strengthening cardiopulmonary capacity, enabling the blood to absorb a large amount of oxygen in a short period, and significantly boosting physical abilities during respiration.

Overuse can also lead to considerable damage to one's body.

The advantage is that the first generation of breathing technique swordsmen created various schools of breathing techniques and accompanying sword styles based on their individual personalities, and these have been passed down to the present day, allowing people to freely choose the corresponding school to learn.

Furthermore, in the later stages of the work, powerful auxiliary abilities such as the "Demon Slayer Mark," "Crimson Red Blade," and "Transparent World" appeared.

The Demon Slayer Mark is an ability that trades lifespan for combat power, and the Crimson Red Blade is more about the weapon itself; we'll set those two aside for now.

The Transparent World, however, requires the user to achieve perfect and precise control over their breathing and movements, thereby gaining the opportunity to reach the ultimate martial arts realm where the entire world becomes transparent, allowing one to see through everything.

If you have any ideas, you can try to search for the whereabouts of these breathing techniques and analyze the similarities and differences between them and Ripple Chi Kung. If you can use Ripple to power the accompanying sword styles of the breathing techniques, it should significantly enhance your strength.

Chapter 64: Miyauchi Hiyage's New Persona

While staying at home and waiting for the Diary's update, Yotsuya Miko saw that the Diary had changed. Almost immediately, she posted a message in the Diary Enthusiasts Club announcing the update, and then opened the Diary to read today's entry.

Who would have thought that after actively avoiding this Diary for the past half month, she would now be so dependent on it?

After all, Yotsuya Miko had already tested it at home today. Neither the soul of her deceased father nor the terrifying vengeful spirit beside her father could detect the Diary in her hand.

Moreover, when she held the Diary, after some simple probing, those vengeful spirits seemed to stop pestering her, no longer suspicious of her clumsy acting as before.

In other words, the method Little Bocchi mentioned yesterday, using the Diary to escape vengeful spirits, actually works!

After verifying this, Yotsuya Miko felt that she could no longer be without this magical Diary.

After reading the Diary entry written by the mysterious person today, Yotsuya Miko was first thrown into a panic by the existence of such cunning demons in this world.

If the mysterious person hadn't warned her, she would likely have fallen victim if she encountered a vengeful spirit disguised as an ordinary person greeting her!

Therefore, she needed to be more careful in her daily life and not casually get involved in other people's business.

After all, her life was already like this; who else could she help?

She'd better focus on saving her own life first.

Later, she saw that powerful vengeful spirits would even use people with strong life energy as barbecue grills to make vengeful spirit barbecue. Just thinking about that scene made her unable to accept it.

"I'm no match for those demons right now; I'll just play dead with the Diary." Yotsuya Miko clutched the Diary tightly, refusing to let go.

However, in today's diary, the mysterious person also mentioned the Mystic Eyes of Death Perception, which can suppress demonic eyes, and the so-called Demon Slayer Corps, which made Yotsuya Miko slightly interested.

She naturally wanted the Mystic Eyes of Death Perception that could suppress her own eyes, and the mysterious person even directly mentioned where to buy them.

It's just that the owner of Garan no Dō seems to be a wanted criminal. Although she doesn't know why that person is wanted, Yotsuya Miko doesn't want to get involved with such a dangerous individual right now.

Therefore, after her gaze lingered on the Mystic Eyes of Death Perception with reluctance, she shifted her attention to the mentioned Demon Slayer Corps and breathing techniques.

In Japan, the concepts of demons and ghosts are separate.

Demons are positioned more like yokai.

Therefore, Yotsuya Miko could naturally distinguish that the enemies of the Demon Slayer Corps were likely not vengeful spirits.

However, this didn't stop Yotsuya Miko from admiring the cool-sounding name of the Demon Slayer Corps.

Having almost developed a mental illness from the vengeful spirits, Yotsuya Miko wished she could quickly find the descendants of the Demon Slayer Corps and learn those breathing techniques from them to rapidly enhance her strength.

As for the potential burden on her body?

Yotsuya Miko felt that she wanted to drive those vengeful spirits and demons away from her side more than anything, even if it meant shortening her lifespan by a few years.

Besides, the mysterious person had already said in the Diary that one could try using Ripple Chi Kung to power the sword techniques.

And that Transparent World, it sounds so mystical!

If she could truly make the entire world transparent, she should be able to use this ability to see through the weaknesses of those vengeful spirits!

It's a shame she can't use the comment function yet; otherwise, she would definitely have asked more in the comments about how to achieve the Transparent World.

At the same time, she was also chatting with others in the group who had finished reading the Diary update about the Mystic Eyes of Death Perception and the Demon Slayer Corps.

Miko: "Has anyone heard of Garan no Dō and the Demon Slayer Corps?"

Below were a bunch of girls shaking their heads, indicating they had never heard of them.

Kashiko Kasumi: "That mysterious person is being coy again; one is a fugitive wanted by the underworld, and the other is an organization from the last century. These are simply too difficult to find!"

Kaguya: "I will ask Shitamachi Godmother to confirm the matter of the Demon Slayer Corps. Even if she hasn't heard of them, she knew many people in the exorcism world when she was younger, so such an organization that was active in the last century should have left some traces in history, right?"

Kaguya: "As for Garan no Dō, I will also inquire. However, if Shitamachi doesn't know, we'll put it aside for now, as we are indeed not yet in a position to attract the attention of other supernatural forces."

Shitamachi Godmother had lived for a long time and always worked independently, so she didn't have access to any profound secrets. However, having lived in the underworld for a long time, she still had some intelligence channels.

Because they had only learned a part of the world's truth from Yotsuya Miko and Shitamachi Godmother yesterday, more people in the group were willing to speak now compared to before.

And today, with the Demon Slayer Corps, another breathing technique that sounded like it had a story, and the Transparent World, which was highly praised by the mysterious person, these girls were all discussing the story called Demon Slayer.

Miyauchi Hiyage nodded, sensing the responses coming from all directions.

What he said was basically true.

While he wasn't sure if Garan no Dō and Aozaki Touko existed in this world, the fact that the Tokyo in this world truly had the area of Mifune City from Kara no Kyoukai was enough. He had observed the area himself these past few days, but found nothing.

And this world did indeed have the Demon Slayer Corps.

After all, Demon Slayer's final chapter featured a modern-day storyline, briefly explaining the descendants and reincarnations of the manga's main characters.

Using this information, Miyauchi Hiyage didn't spend much effort online to pinpoint a moderately famous painter who had debuted several years ago but had only ever drawn one female character.

That person's name was Yushiro, and in the world of Demon Slayer, he was the only "demon" to survive until the end of the story.

Therefore, it could be confirmed that the story of Demon Slayer had likely concluded, and the Demon Slayer Corps had probably been completely disbanded by now.

He just didn't know what connection Yushiro, the demon, had with other supernatural forces.

However, he did want to have the girls who possessed the Diary study the breathing swordsmen's sword techniques to see if it could improve their strength.

The combination of the Demon Slayer Mark, Crimson Red Blade, and Transparent World from the later stages of Demon Slayer did indeed offer a significant boost to combat power.

Among them, Transparent World was clearly the most mystical, and the ultimate power the protagonist group obtained only at the very end.

In Miyauchi Hiyage's opinion, this already touched upon spiritual power.

If they could truly reach that level, Miyauchi Hiyage couldn't imagine any vengeful spirits being able to harm them.

Let alone vengeful spirits, their combat power would be enough to queue up and fight Sukuna.

Of course, even if the girls couldn't immediately achieve the great feat of Transparent World, the myriad breathing styles and sword skills of the Demon Slayer Corps would still offer plenty of room for the girls with the Diary to learn from.

As long as they could figure out even a little something, it would likely increase their combat power considerably.

If they could also get their hands on a few Nichirin Blades that were highly likely to conduct Ripple energy, reaching the level of a Grade 1 Sorcerer wouldn't be too difficult.

Moreover, once these girls discovered that the Demon Slayer Corps truly existed, Miyauchi Hiyage could naturally establish the Miyauchi Family as a rural family that had once received favors from the Demon Slayer Corps and kept some fragmented breathing techniques within the family.

After all, the Demon Slayer Corps had existed for hundreds of years, training countless demon-slaying swordsmen. And after Muzan's death, it had been about a century since the Demon Slayer Corps disbanded.

A small rural family whose ancestors had received favors from the Demon Slayer Corps countless years ago, fortunately passing down fragmented breathing techniques to modern times – who could tell if it was true or not?

And if Miyauchi Hiyage were ever detected by the Jujutsu Headquarters in the future, he could use this persona.

A gifted cultivation prodigy who, on his own, perfected the fragmented breathing techniques passed down from his ancestors.

Then, he could layer on Chongyun's persona from Genshin Impact, who also possessed the Pure Yang Body, believing that vengeful spirits and evil spirits existed in the world, and thus had been researching related horror and thriller works.

He had specifically bought a mansion in Beika Town after hearing about the numerous vengeful spirits there, but due to his overly powerful physique, no vengeful spirits or evil spirits had dared to appear near him so far.

If necessary, Miyauchi Hiyage wouldn't mind fabricating a story for himself, something like Demon Slayer 2: Jujutsu Kaisen.

Chapter 65: Teacher Kashiko Kasumi, I'm Your Fan!

Disguising himself as a descendant of the Demon Slayer Corps was a safeguard Miyauchi Hiyage had decided on after confirming that this world had also incorporated the story of Demon Slayer.

After all, as time went on, his Pure Yang Body was simply too dazzling. Ripple breathing could suppress some of it, but it only alleviated the problem of excess Yang energy within him; it couldn't hide it.

Sooner or later, his existence would be noticed by the girls who held the Diaries.

At that time, he would inevitably be tested and suspected.

Rather than passively enduring it, it was better to proactively involve himself.

After all, when you're out and about, your identity is what you make it.

Who says a diary entry must contain only true things? Couldn't one just make things up?

Therefore, upon discovering signs of supernatural resurgence in this world, Miyauchi Hiyage had already begun to arrange an identity for himself.

And playing this role held no pressure for him.

This was because the rewards from the Diary were completely genuine, transferring almost all content related to Ripple Chi Kung into his mind.

This even included the Sanskrit version and the even more ancient Origin Ripple.

Miyauchi Hiyage could say without exaggeration that throughout the thousands of years of Ripple Chi Kung history, quite a few people had indeed developed derivative powers similar to breathing techniques.

And how much of this had he written in the Diary?

Saying half of it would be an exaggeration.

As of now, he had only taught the introductory practice of Ripple Chi Kung in the Diary, given an introductory guidance session, and the day before yesterday, he wrote about how to use Ripple Chi Kung to get a good night's sleep.

Even if those girls could use the so-called Reading Points to improve their Ripple Chi Kung, based on Miyauchi Hiyage's last observation of those girls, it would probably only speed up their training by about tenfold.

It would be difficult for them to reach his current level, let alone deduce the evolution of Ripple Chi Kung over thousands of years.

And by the time they found the whereabouts of the breathing techniques and began to analyze the differences between Ripple Chi Kung and the breathing techniques, Miyauchi Hiyage could smoothly introduce the "Silver Ripple Overdrive," which had performed excellently in mechanical combat and could be conducted through metal, along with a series of derivative skills, to disguise them as the breathing techniques from Demon Slayer.

At that time, if he used Silver Ripple Overdrive to casually swing a sword and chop a giant rock, who would suspect he was using pure Ripple Chi Kung?

Even if the Demon Slayer Corps from a hundred years ago or Joseph Joestar came here, they probably wouldn't be able to tell what he was using.

Of course, if the Diary were to give him Sun Breathing and Transparent World as rewards someday, it would save him a lot of trouble.

After all, with the Pure Yang Body, he could unleash far greater power than ordinary people with either Ripple Chi Kung or Sun Breathing.

Perhaps the moment he obtained Sun Breathing, he would, like Tsugikuni Yoriichi, immediately activate the Demon Slayer Mark and Transparent World without taking any damage.

After drinking a cup of Celestial Joy Tea, Miyauchi Hiyage, filled with Yang energy, pulled Jerry along to stay up late researching the thousand derivative abilities of Ripple Chi Kung.

He had to admit, Jerry, who had synchronized with two "Tom" abilities, was even more talented in this research than Miyauchi Hiyage himself, sometimes even feeling a sense of pressure.

However, pressure meant motivation. If he couldn't keep Jerry in check, he could imagine a whole lot of scenarios where Jerry would mess around and cause destruction everywhere.

After school the next day, Miyauchi Hiyage didn't rush home. Instead, he took a detour to Akihabara.

Since the first volume of Kasumigaoka Utaha's Love Metronome was released today, Miyauchi Hiyage, a devoted fan of Kashiko Kasumi, naturally had to get a few copies.

Of course, being cautious, he had disguised himself beforehand to ensure no unexpected incidents occurred.

The purchase went smoothly. Miyauchi Hiyage casually asked the store clerk about the sales of Love Metronome.

After all, it was a debut work by a new author. Although there had been some promotion, it couldn't have been too extensive, so the actual sales were quite dismal.

Miyauchi Hiyage already knew this, so he wasn't surprised.

After all, the original work mentioned that Kasumigaoka Utaha's debut novel didn't sell well in its early stages and even faced the risk of being canceled.

In the story, Aki Tomoya, a popular blogger, stepped in to help promote it, making a significant contribution to the novel's promotion and eventual sales.

This was also the reason why Kasumigaoka Utaha and Aki Tomoya met and formed a connection in the original work.

However, now that Kasumigaoka Utaha had just finished the first volume, she already knew about her future development. He wondered what the ultimate fate of Love Metronome would be in this world.

Upon returning home, Miyauchi Hiyage ate a bento he bought from a convenience store while reading her work.

As he read, he couldn't help but feel some confusion.