Isekai Adventure in the Dimensional Cube

Originally, the carriage that had become quiet due to Rengoku Kyoujurou's presence was suddenly livened up again by the abrupt entrance of three people.

"Hmm? You are...?"

Rengoku Kyoujurou looked at the three who had burst in, tilting his head slightly.

Reiger also glanced at the trio.

They were three young swordsmen who, like Rengoku Kyoujurou, were in their own way quite impressive and distinctive.

"You, you're doing well! Mr. Rengoku! Sorry for being impolite!"

The one who called out in a fluster had deep crimson hair and eyes of the same color, reflecting a hint of naivety in his appearance, with a scar on his left forehead and earrings resembling a sun wheel on his ears. He was wearing a black uniform with a haori in a checkered pattern of black and green.

"Someone stop this stupid pig! I can't take it anymore!"

Contrary to the first one who was more polite, another boy wearing the same uniform and a yellow haori with a triangular pattern, sporting golden short and wavy hair, didn't spare Rengoku Kyoujurou a glance and kept shouting loudly.

At this moment, both of them were clinging to the pig-head who had previously barged in, desperately trying to hold him back.

Unfortunately, they were easily shrugged off.

"Hahaha! Are you the Flame Pillar?"

The pig-head was still there, shouting excitedly.

And he really was wearing a pig-head.

By his voice, this person should be just as young as the other two, but he was not only out of uniform but also wearing a boar head mask, with deer fur at his waist and bear fur at his feet. His upper body was bare; he only wore uniform-style black pants on the lower half, making him look just like a pig-headed human, especially comical.

With their appearances and outfits, these three didn't quite fit in with ordinary people.

Such unique attire either belonged to clowns seeking attention or to great figures indifferent to the public gaze.

And these three, although far from being considered great figures at the moment, were important characters in the original storyline.

Or rather, this trio was the main character group in the original work named "Demon Slayer," the center of the world stage, the focal point where the story unfolds.

All three were swordsmen of the Demon Slayer Corps, they were Ghost Hunters.

"Oh! It's you!"

Rengoku Kyoujurou, who initially looked puzzled, immediately showed an expression of realization upon seeing the red-haired boy.

"That's right! I am the Flame Pillar!"

Understanding that the three were companions, Rengoku Kyoujurou spoke affirmatively, puffing out his chest boldly.

Yet, as Rengoku Kyoujurou affirmed this, the pig-headed boy moved.

"Pig Assault!"

This pig-head, without a second thought, charged head-first at Rengoku Kyoujurou.

"Wait! Inosuke!"

"You idiotic pig!"

The red-haired and the yellow-haired boys who had been shrugged off immediately cried out in succession.

But by then, the pig-headed boy had already headbutted his way in front of Rengoku Kyoujurou.

The speed was fast and the momentum strong; he was truly like a wild boar in a charge. If he made contact, one would likely be sent flying instantly, crashing through the train carriage wall and ending up outside on the tracks, right?

However—

"Now, now, calm down, pig-head boy."

Rengoku Kyoujurou's voice rose.

Not from in front of where the pig-head had charged but from behind him.

"I just met an important friend sitting over there. I can't have you hurting them. Have you calmed down now?"

As he spoke, Rengoku Kyoujurou's haori gently fluttered down, and he appeared behind the pig-headed boy, laying a hand on him and pinning him to the ground.

"What...!?"

The eyes beneath the pig-head mask narrowed.

"So, so fast!"

"Couldn't see at all!"

The red-haired and yellow-haired boys, now back on their feet, were equally astonished at the sight.

Only Reiger, still sitting there without moving an inch or even paying attention to the situation, reached over and took a bento box from the many that Rengoku Kyoujurou had brought.

"I haven't had enough to eat yet, may I have one of these?"

Reiger asked Rengoku Kyoujurou as if no one else was around.

"Of course, no problem! Go ahead and eat!"

Rengoku Kyoujurou replied heartily.

"Thanks."

Reiger opened the bento box and began to eat.

Rengoku Kyoujurou looked towards the three boys standing there and grinned.

"Do you guys want some too? It's on me!"

His words were met with the three of them shaking their heads in unison like bobbleheads.

"Is that so? That's a shame!"

Although Rengoku Kyoujurou said this, the bright smile never left his face. He let go of the boar-headed boy and sat back down next to Reiger.

"Are you alright?" The blond boy hurried to help the boar-headed boy up, complaining, "I told you not to be so impulsive, the opponent is a Pillar! We were just recently the lowest rank of Kitsu, how could we possibly win against a Pillar?"

"I'm sorry, Mr. Rengoku." The red-haired boy repeatedly bowed in apology to Rengoku Kyoujurou, adding, "Inosuke didn't mean any harm."

"Hmm! I forgive you!" Rengoku Kyoujurou crossed his arms, nodding earnestly, and asked, "Are these two your friends?"

"Yes." The red-haired boy quickly introduced them to Rengoku Kyoujurou, saying, "They are Agatsuma Zenitsu and Hashibira Inosuke."

Agatsuma Zenitsu was the blond boy.

Hashibira Inosuke was the boar-headed boy.

"Ah." The red-haired boy suddenly remembered something and introduced himself to Reiger who was eating his lunch, "I am Kamado Tanjirou, pleased to meet you."

Kamado Tanjirou, a newcomer to the Demon Slayer Corps, had joined only a few months ago, still a greenhorn.

But the uniqueness of his person and the special circumstances surrounding him might even surpass the Pillars in the eyes of some.

"Hello."

Reiger gave the protagonist of the original story a cursory glance and nodded at him.

Of course, while nodding, Reiger didn't forget to glance behind Tanjirou.

There, a long box was being carried by the protagonist of the original story. From within it, one could just barely make out the sound of steady breathing.

Reiger glanced at the box briefly, then withdrew his gaze.

"So, Tanjirou, what brings you guys here?" Rengoku Kyoujurou asked without looking away from the front.

"...I'm Tanjirou, not 'Goukuchi'." Tanjirou corrected him with a small mutter, then said, "We were sent here. They said the number of victims on the Infinite Train keeps increasing, so they dispatched us to support Mr. Rengoku."

"To be honest, I didn't want to come at all." Zenitsu interjected with quite an oblivious manner, saying, "This is a mission that even a Pillar has to handle personally. What use is it sending us low-ranked members here for support? We're going to die, right? We're definitely going to die!"

As he spoke, tears streamed down Zenitsu's face; he looked like he wanted to run away.

On the other hand, Inosuke, wearing the boar's head, was already revived on the spot.

"The demon we need to deal with is this steel beast, right? I saw through that much!" Inosuke was making a ruckus, exclaiming, "Leave it to me! Wild Boar Charge!"

The boar-headed delinquent charged, heading straight into the walls of the train carriage.

"Stop it!" Zenitsu quickly grabbed him, screaming hysterically, "That's why I'm saying it's a train! A train! Not some lord of the land or some steel beast! And definitely not a demon!"

"Huh?" Tanjirou turned to look at Zenitsu with an incredulous face.

"...Why are you looking at me like that? Why are you surprised?" Zenitsu was freaking out, roaring, "You two country bumpkins who have never even seen a train before! Ahh! I've had enough!"

"Hahaha!" Rengoku Kyoujurou burst into laughter and said, "You guys are really amusing!"

No, they were insane, that's what.

Reiger, quietly eating his lunch on the side, didn't make any sarcastic remarks. He just felt a bit out of place and that he shouldn't continue to stay here.

What's this called?

I often feel like I can't fit in with the group because I am not silly enough.jpg

That's exactly how Reiger felt right then.

After causing a scene for a while, everyone finally settled down and took their seats.

"Ha ha! Hahaha!"

Inosuke stood by the window, banging hard on it, as if he had a score to settle with the train, which left Zenitsu sitting next to him looking utterly resigned to his fate.

Tanjirou, however, sat opposite Reiger and Rengoku Kyoujurou and very carefully set down the box he'd been carrying on his back next to him, treating it as if it were his most precious treasure.

As he'd explained, the trio had been dispatched by the Demon Slayer Corps to support Rengoku Kyoujurou.

There had been over forty disappearances on the Infinite Train suspected to be the work of demons, and several members of the Corps sent to investigate had gone missing. The higher-ups believed Rengoku Kyoujurou might need additional personnel, so they sent Tanjirou and his group over.

Even though the three were fresh recruits in the Demon Slayer Corps and their ranks were not high, they had recently encountered a demon of the Lower Ranks, specifically the Lower Rank Five — Rui.

In the battle against the Lower Rank Five, the Demon Slayer Corps suffered heavy casualties. Eventually, it alarmed the leader of the Corps who sent two Pillars to support Tanjirou and his friends.

But before the Pillars could arrive, Zenitsu and Inosuke had already taken care of their respective demons, and Tanjirou had unleashed an extraordinary fighting ability. He nearly succeeded in beheading Rui, overcoming this member of the Twelve Kizuki.

Therefore, although the protagonist trio might be low-ranked, their combat prowess was truly not to be underestimated. They had officially caught the attention of the higher-ups in the Corps, even garnering keen interest from the leader and several Pillars.

This time, the dispatch of Tanjirou and his friends was due to the recommendation of a Pillar.

"I see, it was Kochou who recommended you guys?" Rengoku Kyoujurou nodded earnestly and said, "Then you should stay by my side. I indeed want to observe you, Tanjirou."

Upon hearing this, Tanjirou didn't show confusion but rather lowered his head with a hint of gloom on his face.