I, Yuhaka, am hungry!

Bronya projected several manufacturing machines for forging Nichirin Blades. At first, the swordsmiths were resistant to the manufacturing machines Bronya projected, after all, they couldn't believe that something made by machine could be of higher quality than the Nichirin Blades they made by hand.

However, after Bronya taught them how to use the manufacturing machine and forged a few Nichirin Blades for evaluation, the swordsmiths couldn't help but exclaim how good it was. Although a few stubborn swordsmiths disliked the manufacturing machine, they also knew very well that it would take a long time to replace all the Nichirin Blades in the hands of all the Demon Slayer Corps members. Even if the entire village of swordsmiths forged swords together, it would be extremely difficult to complete the task in a short period of time.

Most importantly, Bronya can also project a high-tech furnace for forging swords. After all, the mineral materials that Merlin and the others brought are still very difficult to process. Even with coal, it takes time to smelt those minerals.

Sirin's situation is relatively stable. She occasionally checks the space of this world to see if anyone is using spatial abilities. Sometimes she helps the Demon Slayer Corps with teleportation and transporting members. Thanks to Sirin's abilities, the Demon Slayer Corps can now carry out missions very quickly, which has greatly improved their efficiency in killing demons and ghouls.

Meanwhile, besides helping with some affairs at the Butterfly Mansion, some of the Meru Cats under Yuhaka's command also help the Demon Slayer Corps members search for ghouls and demons. The Meru Cats do have the ability to find ghouls.

Basically no ghoul can escape the search of the Mewcats, and with their good combat and support abilities, the Demon Slayer Corps members really like them. Most importantly, the Mewcats are very cute!

Who in the world doesn't like petting cats?

.................................................................................

After a large number of Nichirin Blades with training gauges were made for the Demon Slayer Corps, most of the members switched to these Nichirin Blades with training gauges. Of course, although they switched to katanas with training gauges, most of the Demon Slayer Corps members had not yet mastered the skill of condensing and training ki, so they inevitably had to undergo special training.

In the training grounds located at the Demon Slayer Corps headquarters.

“Eeya da————!”

A scream from a blond boy drew the attention of the surrounding Demon Slayer Corps members. Tanjiro, looking embarrassed, glanced up at Zenitsu, who was clinging to a tree trunk, and said:

"Zenitsu-kun, stop like that, come down and train quickly, let's finish training as soon as possible—"

Before Tanjiro could finish speaking, Zenitsu Agatsuma, who was clinging to the tree, interrupted him, saying:

"No way—! This training will kill me! Something this big will definitely kill me!"

Upon hearing Zenitsu's words, Tanjiro broke out in a cold sweat and turned to look at Inosuke Hashibira, who was undergoing special training nearby.

"Pigs swoosh!"

Inosuke forcefully pushed aside a tree stump hanging on a rope and then rammed it with his head. The Demon Slayer Corps members around him couldn't help but feel a headache at Inosuke's actions. Seeing Inosuke trying to catch the tree stump with his head, they quickly tried to persuade him not to do it.

Meanwhile, Sanemi Shinazugawa, who was observing from a distance, was also looking at Tanjiro and his group with a pained expression. To be honest, apart from Tanjiro, the performance of the others was giving Sanemi Shinazugawa a real headache.

Hashibira Inosuke, the one wearing the boar's head mask, has considerable talent. According to information from the story, this boar-headed man has impressive abilities, having mastered his own breathing technique. His only flaw is a lack of common sense; he tends to act recklessly in everything he does.

As for Zenitsu Agatsuma... Sanemi Shinazugawa doesn't want to comment on him. He's a complete oddball, though he is undeniably powerful...

Meanwhile, Shinazugawa Sanemi's younger brother, Shinazugawa Genya, was also training. To be honest, Shinazugawa Sanemi was shocked when he saw his brother die in the manga, as he never expected his brother to die in the final battle of the Infinity Castle.

Immediately, Sanemi Shinazugawa was completely flustered.

After all, witnessing the death of your only family member is not a pleasant experience.

However, this prompted Sanemi Shinazugawa to try every possible way to keep his Genya Shinazugawa alive, and the other Pillars also offered Sanemi Shinazugawa advice.

After several weeks, most of the Demon Slayer Corps members replaced their Nichirin Blades with Nichirin Blades equipped with Ki Gauges, and many Demon Slayer Corps members also developed the ability to train Ki.

Although only one person mastered the Ripple technique, it was basically harmless, since Ji Lin and the others were there, and Yuhaka and the others eliminated the demons using physical methods.

Soon, the Demon Slayer Corps members, having mastered ki training, began a large-scale counterattack against demons and ghouls, wielding Nichirin Blades with ki gauges.

Merlin and Kasugai-raven search for traces of demons and ghouls, while Sirin acts as a portal to send Demon Slayer Corps members to their target location. Finally, the Demon Slayer Corps members go to eliminate the demons or ghouls.

The Demon Slayer Corps members who had learned Ki training wielded Nichirin Blades with Ki training slots, and dealing with ghouls and demons was basically like cutting mud; they were usually taken down in just a few moves.

Most importantly, the Nichirin Blade, crafted from Swallowstone and Dragonstone, is extremely durable. You basically don't have to worry about it breaking; the only thing to worry about is it getting dull.

Chapter 502 [Pre-Battle Preparations]

After about two weeks in the world of Demon Slayer, Sirin finally found the coordinates of the Infinity Castle.

Upon hearing Sirin's words, Kagaya Ubuyashiki summoned all the Pillars back to headquarters to begin a meeting.

Kagaya Ubuyashiki looked at the spot Sirin was pointing to, then turned to Sirin and asked:

"Miss Sirin, are you sure the enemy's location is this position?"

In response to Kagaya Ubuyashiki's question, Sirin confidently crossed her arms and nodded, saying:

"Of course, based on my perception from the past few days, the target is definitely in this location."

Shinobu Kocho, standing to the side, also looked somewhat puzzled and said:

"That place... I remember it was a wasteland, with no caves or buildings to hide in?"

Kagaya Ubuyashiki, who was standing nearby, shook his head and explained to Shinobu Kocho:

"That's not necessarily true. According to the information brought by Miss Ji Lin, the location of Infinite City is very likely underground."

Upon hearing Kagaya Ubuyashiki's words, the Pillars present nodded in understanding. After all, being underground explained why Ms. Sirin had discovered the location of the Infinity Castle.

The next part is about launching a counterattack on the Infinity Castle where Muzan Kibutsuji is located. According to Sirin, she can suppress or control the skills of Nakime among the Twelve Kizuki, so everyone no longer has to worry about Muzan Kibutsuji escaping. Most importantly, with Sirin there, they don't have to worry about Nakime controlling the Blood Demon Art to divide the Infinity Castle into several battlefields.

Although they couldn't possibly deal with all the Upper Moon demons at once, the biggest problem was that they didn't know how many demons were in the Infinity Castle. Regarding this issue, Sanemi Shinazugawa suggested that all members of the Demon Slayer Corps attack together, so that they wouldn't have to worry about the number of demons.

Sanemi Shinazugawa's proposal was met with opposition. After all, it was impossible for them to call upon all the Demon Slayer Corps members to attack Muzan Kibutsuji's Infinity Castle. If traps were to appear in the Infinity Castle that weren't part of the storyline, it could very well result in heavy casualties among the Demon Slayer Corps members.

Kagaya Ubuyashiki also disagreed with this plan, but he felt that some of the more powerful members of the Demon Slayer Corps could be used in the upcoming "Kibutsuji Muzan Extermination Campaign".

Meanwhile, Ji Lin was also willing to help deal with Muzan Kibutsuji and his group. After all, the main objective this time was to deal with Muzan Kibutsuji, the source of ghouls. Although it was fine to leave it to the Demon Slayer Corps, since it wasn't just a matter of them eliminating the target; it was also possible for native creatures to eliminate foreign creatures.

However, there are very few cases of native species eliminating invasive alien species, so Zelus will not cite any examples.

.................................. ...............................

After the meeting, Yuhaka and the others followed Shinobu back to the Butterfly Mansion. In Shinobu's bedroom, Himeko, watching Shinobu preparing the medicine, asked curiously:

"Sister Shinobu, is it true that you said in the meeting that you're going to deal with Upper Moon Two?"

Regarding Ji Lin's question, Shinobu Kocho nodded and said:

"That's right, that's what I said in the meeting room, and the lord agreed..."

Then Shinobu turned to look at Hime Rin and said:

"Of course, my lord agreed to my request on one condition: I must bring a few people with me."

Hearing this, Ji Lin nodded with a sigh of relief, and Kocho Shinobu smiled at Ji Lin's expression and said:

"Sister Ji Lin doesn't really think I'm stupid enough to go alone. Although I'm a little reluctant, I know very well that I'm not strong enough to kill Upper Moon Two on my own."

After seeing the information about Upper Moon Two [Doma] in the Demon Slayer storyline, Shinobu Kocho knew that Doma's Blood Demon Art was very effective against Demon Slayer Corps swordsmen who knew Breathing Techniques, since anyone who used Breathing Techniques would inevitably inhale Doma's Blood Demon Art.

However, this time is different. In addition to the Insect Breathing technique, Shinobu has learned to cultivate ki. At the same time, her Nichirin Blade has been changed to resemble a samurai sword. Although she can no longer use her most proficient poison, Shinobu feels that she no longer needs to rely on poison to eliminate demons after learning to cultivate ki.

After all, there are limitations to eliminating Doma with poison. This led Shinobu Kocho to abandon her original rapier-like Nichirin Blade and choose a katana-like Nichirin Blade instead. Although Shinobu Kocho was not strong enough to cut off the demon's head with the Nichirin Blade, with the help of her ki training, cutting through metal was not a problem at all, let alone the demon's neck.

Furthermore, the Demon Drug G that Ji Lin and the others brought gave Shinobu the ability to arm wrestle and defeat Giyu Tomioka, which shows what kind of effect Demon Drug G had on Shinobu.

After making all the preparations, Kagaya Ubuyashiki also arranged the layout of the subjugation team.

First, Kagaya Ubuyashiki's command post was personally led by Kagaya Ubuyashiki himself, while Demon Slayer Corps trainers Sakonji Urokodaki, Jigoro Kuwashima, and Makijuro Rengoku served as his guards.

Incidentally, due to the Demon Slayer manga storyline that Ji Lin brought over, Kaigaku has now been dealt with, so the incident of Kuwajima Jigoro committing seppuku to atone for Kaigaku's transformation into a demon has no longer occurred.

Bronya is in charge of intelligence command at the headquarters. After all, Bronya has the ability to project machinery, which allows Kagaya Ubuyashiki to see the situation of other Demon Slayer Corps members and give orders. Of course, this does not mean that Bronya cannot go out to fight. You should know that Bronya can also project Titan armor.

Moreover, the other teams are quite simple. The Pillars of the Demon Slayer Corps are basically divided into groups of three to deal with each Upper Moon demon. Among them, Hime Rin and Yuhka are each responsible for one Upper Moon. The two of them can handle the Upper Moons without much trouble. Although Yuhka does not know Ripple Breathing, he does know Dragon-type Breath (or rather, a laser cannon).

One bite and no matter what kind of monster you are, you won't even be left with a crumb.

Chapter 503 [The Infinite City Conquest (Part 1)]

The next morning, preparations for the attack on Infinity Castle began at the Demon Slayer Corps headquarters.

In the relatively spacious courtyard, Kagaya Ubuyashiki began to explain the plan to the Demon Slayer Corps swordsmen. The plan was simple: to defeat the Twelve Demon Moons, or rather, the Six Demon Moons.

After defeating the Upper Moon demons, the next step is to deal with the root of all evil, Muzan Kibutsuji.

Ji Lin and Yuhaka were responsible for dealing with one Upper Moon on their own, since to Yuhaka and the others were just a burden.

Yuhaka probably doesn't care much about what people think except for Ji Lin and the others. If he gets into a fight with someone, Yuhaka basically won't care what's under his feet.

The current groupings are as follows.

The Upper Moon One extermination team was led by the Stone Pillar Gyomei Himejima, the Wind Pillar Sanemi Shinazugawa, and the Mist Pillar Muichiro Tokito.

The Upper Moon 2 extermination team was led by Insect Pillar Shinobu Kocho, Snake Pillar Obanai Iguro, and Love Pillar Mitsuri Kanroji.

The Upper Moon Three Extermination Squad is led by the Sound Hashira, Tengen Uzui; the Water Hashira, Giyu Tomioka; and the Flame Hashira, Kyojuro Rengoku.

Ji Lin was responsible for dealing with Upper Moon Five, Yuhaka for Upper Moon Four, Sirin for interfering with Nakime's Blood Demon Art within the Infinity Castle, and the Titan mechs projected by Bronya for dealing with Upper Moon Six and other miscellaneous demons and ghouls that might exist in the Infinity Castle.

Kagaya Ubuyashiki, looking at the prepared Demon Slayer Corps troops, also spoke with Sirin, who was standing beside him:

"Miss Sirin, please open the road to the Infinite City."

Upon hearing Kagaya Ubuyashiki's words, Sirin turned to look at Hime Rin, who was standing beside her. Hime Rin nodded to Sirin and gave her a thumbs up to indicate that there was no problem.

Seeing that Ji Lin had also expressed this view, Sirin also used her ability to open a gate of imaginary numbers leading to the Infinite Castle. The Demon Slayer Corps swordsmen were not surprised at all when they saw the gate of imaginary numbers unfolding in front of them. After all, they had been passing through the gate of imaginary numbers that Sirin had opened for several weeks. From being startled at first, they had become used to it.

Himejima Gyomei flicked the prayer beads in his hand and said to Shinazugawa Sanemi and Tokito Muichiro behind him:

"Let's go."

With that, Himejima Gyoumei led the team toward the Gate of Imaginary Numbers, and Yuhaka and the others followed them inside.

The battle to subdue Muzan Kibutsuji has officially begun.

.................................................. ...........................

Inside the underground Infinite Castle, Muzan Kibutsuji was lying on a bed, seemingly resting with his eyes closed.

Meanwhile, Nakime sensed something amiss. After sensing the anomalies in the space, she discovered a large number of Demon Slayer Corps swordsmen had appeared within the Infinity Castle. Nakime then reported this to Muzan Kibutsuji, who was standing nearby:

"Lord Muzan, members of the Demon Slayer Corps have entered the Infinity Castle."

Upon hearing Nakime's words, Muzan Kibutsuji, who was lying on the bed, immediately opened his eyes and looked at Nakime, saying:

"Are you kidding me? How could the Demon Slayer Corps possibly—huh?!"

Before Muzan Kibutsuji could finish speaking, through Nakime's memories, he saw the Demon Slayer Corps swordsmen appearing in the Infinity Castle. Muzan's expression immediately turned grim. The Infinity Castle had been his secret base for a long time, and Muzan knew very well that it was the only place where he didn't have to worry about the Demon Slayer Corps harassing him, and also the only safe haven where he could avoid the person who had almost killed him last time.

The arrival of such a large group of Demon Slayer Corps swordsmen here is clearly suspicious. Of course, Muzan Kibutsuji is also wondering if Nakime has betrayed him. However, Muzan Kibutsuji's search of Nakime's memories yields no evidence of her betrayal. This puzzles Muzan Kibutsuji: how did those Demon Slayer Corps swordsmen end up in the Infinity Castle?

After that, Muzan Kibutsuji stopped thinking about these issues. He figured he'd just capture and interrogate the Demon Slayer Corps members and find out!

Muzan Kibutsuji then ordered Nakime to use the Infinity Castle to separate the Demon Slayer Corps teams. Upon hearing Muzan Kibutsuji's order, Nakime plucked a string on her instrument (the name of which is unknown), but... nothing happened.

"...?"

Nakime looked at the instrument in her hand with a puzzled expression, clearly not understanding why she couldn't activate her Blood Demon Art. Muzan Kibutsuji, who was standing nearby, noticed Nakime's situation and asked her what she was doing and why she hadn't separated the Demon Slayer Corps swordsmen yet.

Nakime then told Muzan Kibutsuji that she couldn't control the Infinity Castle. Upon hearing Nakime's words, Muzan Kibutsuji naturally didn't believe her, so he used his ability to control Nakime to change the terrain of the Infinity Castle, but it was to no avail.