Isekai Adventure in the Dimensional Cube

The incident with the Infinite Train was ultimately defined by officials as an accidental derailment.

This was bound to make the Infinite Train hit the headlines once again, and the maintenance staff associated with the Infinite Train were also facing a series of accountability issues.

After all, the Infinite Train had been sent back for maintenance before, and it was only allowed to be put back into operation after assurances that there were "no abnormalities" were loudly proclaimed. Now, to have such a serious incident occur just after it started its journey, it was impossible for those who had previously indirectly mocked the Infinite Train in newspapers for being a "man-eater" to avoid taking some responsibility.

The only thing worth rejoicing about was probably that all two hundred passengers on board were safe and sound, which many might consider a miracle.

As for the existence of the Demon Slayer Corps, it was never mentioned from start to finish.

Since the Demon Slayer Corps is an unofficial organization and strictly speaking even walking around the streets with swords is not allowed, how could they possibly be regarded as heroes who saved two hundred passengers?

Very few people are aware of the existence of demons, and in many people's eyes, demons are nothing more than fictional entities. Even if someone told them that the incident with the Infinite Train was all caused by demons, most people would scoff at such claims.

Therefore, whether it be demons or the Demon Slayer Corps, in this incident, they were doomed not to be reported.

In some ways, the Demon Slayer Corps, like the demons, is an existence that can only operate in the shadows.

Although their existence has a long history, they are a grassroots organization formed spontaneously by people persecuted by demons, and fame or such matters are utterly irrelevant to them.

Reiger felt that this wasn't necessarily a bad thing.

"The enemies of the Demon Slayer Corps are demons, monsters that devour human flesh. If we were to act openly, it's not impossible for demons to attack us preemptively, even targeting people around us. This is very dangerous and must be avoided,"

Kyoujurou Rengoku explained this and told Reiger that historically, the Demon Slayer Corps had several encounters where it was nearly destroyed by demons; therefore, the Demon Slayer Corps always operates secretly and does not publicize its existence.

Especially the location of the leader of the Demon Slayer Corps, which is top secret. Not only is the location thoroughly hidden, but the routes to reach it are also changed periodically; aside from the Pillars, few people know how to get there.

And this time...

"I will take you to meet the leader, young Tsukiguni Yoriichi!"

Kyoujurou Rengoku declared so, using the name Reiger had used in front of Akaza.

"Is that okay?"

Reiger did not refuse, simply asking this question.

"No problem!" Kyoujurou Rengoku said, "Rather, it's the leader himself who requested this; he wants to meet you!"

"He requested it?" Reiger was surprised, "Does your leader of the Demon Slayer Corps already know about me?"

"Yes!" Kyoujurou Rengoku readily admitted, "Because we have Kasugai Crows. My Kasugai Crow has already sent the news about you, young Tsukiguni, back!"

Kasugai Crows are specially trained by the Demon Slayer Corps. They can speak and have a clear sense of self.

The Demon Slayer Corps uses these crows for communication between members, to transmit information, and to issue tasks, thus creating a rather efficient and convenient intelligence network.

Basically, every member of the Demon Slayer Corps receives a Kasugai Crow upon joining. The headquarters of the Demon Slayer Corps uses these crows to assign missions to its members scattered across various locations to hunt demons.

Meanwhile, the crows also gather various pieces of information and send it back to the headquarters of the Demon Slayer Corps, to the leader, enabling him to stay informed of the latest circumstances without leaving his headquarters.

The details of Reiger's existence and his actions on the Infinite Train were sent by Kyoujurou Rengoku's Kasugai Crow back to the headquarters of the Demon Slayer Corps, and to that leader.

Then, the Kasugai Crow brought back instructions from the leader to Kyoujurou Rengoku, expressing a desire to meet Reiger in person.

"How about it, young Tsukiguni? Come with me to meet the leader!"

Kyoujurou Rengoku insisted firmly, even grabbing Reiger's shoulders without waiting for a response, appearing to prevent any attempt to escape.

"Understood, let's meet him, just don't stand so close to me."

Reiger pushed Kyoujurou Rengoku's face away from his own and agreed to the meeting.

He was actually also interested in meeting the head of the Demon Slayer Corps.

The reason was nothing more than a desire to ask for a favor.

After finding out that his destination for this Dimensional Travel was the Demon Slayer World, Reiger had an idea in mind, so his initial aim was to collect the Breathing Techniques of this world.

And since gathering Breathing Techniques was the goal, engaging with the Demon Slayer Corps was essential.

Reiger headed straight here after learning about the Infinite Train incident because he knew that Kyoujurou Rengoku, the Flame Pillar, would be present, and knew the Demon Slayer Corps would be involved.

As for Akaza and Nightmare, the two demons, Reiger was merely interested in understanding the strength of the Twelve Kizuki and the general hierarchy of demons in this world, which is why he became intrigued by them, not because he specifically came for them.

Now that Kyoujurou Rengoku had laid this opportunity before Reiger, there was no reason for him to refuse.

If the head of the Demon Slayer Corps assisted, then gathering the Breathing Techniques would be an easily achievable task.

"Great!" Kyoujurou Rengoku immediately lightened up, patting Reiger's shoulder, "No time to waste, let's set off immediately!"

Kyoujurou Rengoku's words caused the trio of protagonists to quickly gather around.

Or more accurately, it was Tanjirou who wanted to join.

"Mr. Rengoku, may I come back with you guys?"

Tanjirou made this request.

"Hmm? Do you have something important, young Kamado?" Kyoujurou Rengoku paused, then said, "If it's nothing urgent, it's better not to just go to the leader; the leader is not someone you just meet on a whim!"

This was also to hide the location of the leader of the Demon Slayer team and to protect the leader and the safety of the headquarters.

"I just have some questions I'd like to ask the two of you," said Tanjirou. "It's okay if we don't go to the lord's manor."

While speaking, Tanjirou stole a glance at Reiger, clearly very concerned about the relationship between the Fire God Kagura and the Sun Breathing technique Reiger had used before.

"Hmm! If that's the case, then it's no problem!" Rengoku Kyoujurou, understanding the situation, readily replied, "In that case, why not visit my house first? Let me host you!"

"Thank you!" Tanjirou smiled, relieved.

Neither Zenitsu nor Inosuke seemed to have any objections.

"Hey! Big-eyed boy! Do you have a locomotive? Lend it to me to practice my punching!"

Inosuke made an unreasonable request to Rengoku Kyoujurou.

"Practicing punches? That's a great idea!" Rengoku Kyoujurou nodded seriously, "But I don't have one!"

Zenitsu's motivation became stronger.

"If we go to the Flame Pillar's place, then we temporarily don't have to go on missions and if we don't have to go on missions, we don't have to hunt demons and if we don't hunt demons, we won't encounter danger so I won't die!"

After finishing his torrential statement without adding a single punctuation mark, Zenitsu struck a victorious pose on his own.

"Well said, young man!" Rengoku Kyoujurou gave Zenitsu a thumbs up, quite approvingly, but said, "However, that's not possible!"

Thinking of dodging tasks in my house?

You probably don't know how the character 'pillar' in 'Flame Pillar' is written!

Rengoku Kyoujurou had already thought of what kind of task he would assign to Zenitsu.

Thus, Reiger, Rengoku Kyoujurou, Kamado Tanjirou, Agatsuma Zenitsu, and Hashibira Inosuke, a group of five, set off on their return journey.

The members of the Demon Slayer team continued to stay at the scene, clearing up the aftermath.

No one noticed that, in a corner of this aftermath, a headless body that had not disintegrated on the spot even though it was decapitated by the Sun Wheel Blade lay there.

The headless body quietly lying there, seeming utterly lifeless, suddenly moved a finger.

By the time the Demon Slayer team members came over, there was nothing left.

...

At the same time, inside a luxurious mansion, a figure emanated a dark and dangerous aura.

"Tsukiguni Yoriichi?"

The owner of the figure stood in front of a bookshelf as if he was reading a book, yet he suddenly tore the book in half and crushed it into pieces with some unknown force.

This person, oblivious to his actions, held the fragments of the book, his hand trembling.

"Impossible…"

He first murmured, then veins bulged on his forehead.

"Absolutely impossible!"

The name "Tsukiguni Yoriichi"— awakened a segment of his tormented past hidden deep within his heart, making his ancient body ache as if a wound was tormenting him.

Meanwhile, a slight fear within him also awakened.

"He couldn't still be alive," the figure murmured, "He is definitely dead, that is certain."

Otherwise, he wouldn't be here.

If Tsukiguni Yoriichi were still alive, he simply could not be out moving again.

It was because he was confirmed to have died that he appeared again, appeared in this world.

Now, hundreds of years have passed, the real monster compared to himself should have long since died of old age.

"Someone impersonating him?"

The figure in the study spoke to himself.

"But the swordsmanship that beheaded Akaza in a single stroke was indeed Sun Breathing."

Such swordsmanship, such strength, it was just like the real Tsukiguni Yoriichi—terrifying and powerful.

"No, I must confirm who this human really is; only then can I be at ease."

Deciding this, the Ghost General placed his hand beside his temple and called out two names.

"Hantengu, Gyokko, come to me immediately."

The shout finished, and seconds later, two voices responded in his mind.

"Yes, Muzan-sama."