Isekai Adventure in the Dimensional Cube

The person who flew out of the Infinite Train was naturally Reiger.

He broke through the train's flesh wall, leaping out from inside, and in front of Tanjirou and Inosuke, he soared high like an unleashed arrow, cutting through the night sky, and landed in front of the train tracks.

"Whoo——"

The Infinite Train, with its long whistle and the sound of wheels, hurtled toward Reiger, who had landed in front of the tracks, like a rampaging steel behemoth.

"Danger!"

Seeing this scene, Tanjirou, standing on top of the train, was shocked.

"Hey! Lunchbox guy! Run for it!"

Even Inosuke panicked, roaring towards the direction where Reiger was.

Although both of them were from rural areas, having grown up in the mountains without much exposure to the world and not even recognizing a train, this did not prevent them from understanding how dangerous Reiger's current actions were.

Just thinking about it with one's feet, being hit by such a large steel vehicle would surely lead to a bloody and gory end, let alone the fact that the steel vehicle was moving at a shocking speed. If it hit someone, that person would inevitably be shattered to pieces.

The train, now merged with a demon, could not possibly stop, not even slow down.

Reiger's act of standing on the tracks, blocking the path of the train, was simply akin to seeking death.

Yet, despite this, Tanjirou and Inosuke were shocked to find that not only did Reiger not choose to dodge, he stood erect in the wind, calm-faced, watching the rampaging steel behemoth charge toward him.

"Damn it!"

Inosuke couldn't help but charge forward.

Not just Inosuke, Tanjirou also drew a black sword and rushed forward.

"Inosuke!" Tanjirou cried anxiously, "We have to decapitate the demon before big brother gets hit!"

"I know!" Inosuke responded loudly.

The two grasped their swords tightly, letting them emanate a nearly imperceptible warmth.

These were Sun Wheel Blades, the special swords of the Demon Slayer Corps, created from a special iron ore called "Scarlet Crimson Iron Sand" and "Scarlet Crimson Ore" that absorbed sunlight, capable of emitting the same energy as the sun.

The reason why the Demon Slayer Corps could slay demons was, firstly, because its members mastered various breathing techniques, enabling them to unleash power comparable to demons and have the strength to fight against them, and secondly, because of these Sun Wheel Blades.

Normally, demons cannot be killed; unless directly exposed to sunlight, they quickly recover from injuries, can reattach limbs or even regenerate, rendering them virtually immortal.

However, if a demon is decapitated with a Sun Wheel Blade, it will be killed, extinguished on the spot, never to recover.

Because they are forged from special iron ore that has absorbed sunlight, when a demon's neck is severed by a Sun Wheel Blade or its head is cut off, it is nearly equivalent to being exposed to sunlight.

Therefore, when Ghost Hunters successfully join the Corps, they are each presented with a tailor-made Sun Wheel Blade as their demonic-slaying weapon.

Now, the demon controlling the Infinite Train had fused with the train, but if the train was part of the demon's body, then somewhere on the train there must be a weak spot, just like the demon's neck.

If they can cut through that area, decapitate the demon merged with the train, then they can kill the demon.

Tanjirou and Inosuke climbed onto the roof of the train for this very purpose, while Zenitsu stayed in the carriage to protect the passengers.

Now, with Reiger suddenly appearing and about to be struck by the train, the two could only complete their mission as quickly as possible, decapitate the train's head, slay the demon, and then they could rescue Reiger.

Unfortunately, there was simply not enough time for the two to find the demon's weak point and sever its neck.

The weak point of the demon fused with the train had been buried together with a spinal column underneath the front of the Infinite Train, and in their haste, Tanjirou and Inosuke couldn't afford the time to find and sever it.

"It's no use! We're too late!"

"Get out of the way, Lunchbox!"

Tanjirou and Inosuke could only run atop the train, issuing desperate cries.

In such a situation, Reiger, already bathed in the blinding light cast by the onrushing train's headlight, slowly raised a hand.

"[Decompose]."

The Red Wave undulated in the palm of Reiger's hand.

"Whoo——"

The Infinite Train, with its whistle, finally crashed into Reiger with a fierce impact.

Tanjirou and Inosuke had already revealed expressions of despair.

However, the scene they imagined, with blood spraying and flesh blurring, did not occur.

"Buzz!"

In a sound like the trembling of the atmosphere, Reiger's outstretched hand made contact first with the train's head, allowing the Red Wave to spread like a hurricane through his palm, instantly transmitting through the entire body of the Infinite Train.

Then, Reiger powerfully punched out.

"Bang——!!!"

In the deafening roar, the Infinite Train, completely covered by the Red Wave, under the force of Reiger's fierce punch——— fell apart.

"Bang bang bang bang—"

With a series of explosions, the train began to burst apart, car by car. The locomotive separated, and the carriages disconnected from each other, becoming fragmented and scattered.

Reiger didn't completely disintegrate the train into nothingness; he merely disassembled it roughly.

After all, there were passengers on the train, including Rengoku Kyoujurou and the main trio. Reiger certainly did not want to disintegrate them into nothingness and annihilate them on the spot.

So, Reiger only disassembled the body of the Infinite Train, allowing the locomotive to separate and the carriages to scatter, the wheels even exploded on the spot, turning into fragments that fell around the tracks, causing all kinds of parts to fly about in the air.

The sight was truly spectacular.

And Tanjirou and Inosuke, who were standing atop the train, were naturally flung out.

"You've got to be kidding me———!?"

Witnessing the magnificent disassembly of the Infinite Train, the two were thrown into the air and started screaming in shock, their cries long and echoing far and wide.

The two certainly did not know what "magic" was.

In their view, Reiger had just thrown a punch at the oncoming train and, as a result, the train fell apart.

In fact, the train was already disassembled when Reiger used magic to disintegrate it, but since Reiger had only disassembled its structure, the train hadn't fallen apart yet. It was like something built with blocks that could maintain the shape of a train until someone knocked it down.

Therefore, Reiger threw a punch and scattered the blocks.

But Tanjirou and Inosuke didn't know the intricacies of it. They only knew that Reiger had punched the train apart.

So, on the spot, they knelt down.

"Isn't that too strong? It's too strong, right? It's way too strong!"

Tanjirou was still shouting while in mid-air.

"That guy is amazing! So amazing! Hahaha! He just blew up the Earth Lord! Greedy Tarou!"

Inosuke started flailing about, utterly excited.

"I am Tanjirou!"

Tanjirou protested.

The two flew in the air for quite a while before simultaneously crashing into a field.

"Tanjirou! Inosuke!"

It was then that Zenitsu, carrying a wooden box on his back, crawled out from the wreckage of a carriage, and ran over with tears streaming down his face, looking as if he was scared out of his wits.

"Fi-fi-fi-fire, the train came apart! It derailed! Am I missing any parts? Tell me I'm not! That scared me to death!"

Zenitsu's crying was truly unrestrained, appearing to genuinely believe the train had derailed and he might be missing some parts.

On the contrary, Rengoku Kyoujurou, the Flame Hashira, did not hesitate to use his maximum output of "Flame Breathing Fourth Form: Vigorous Flame Serpent" when he sensed the train was falling apart. The vortex of flames burst through all the carriages, managing to stabilize the falling apart carriages and stop them on the tracks with the impact.

"It really disintegrated!"

At this moment, the Flame Hashira leisurely walked out of a carriage door, looking at the chaotic scene and the disassembled Infinite Train, and let out a hearty laugh.

As for Reiger, he glanced at the locomotive that was thrown off the tracks and crashed beside the rails.

"Guh... Aaaaaah...!"

The flesh on the locomotive was undulating continuously.

"How is this possible...!? How could this happen...!?"

From within the flesh, a voice cried out as if in pain and disbelief.

Undoubtedly, it was the demon that had become one with the Infinite Train.

Reiger just happened to know the demon's identity.

The Lower Moon One, the strongest of the Twelve Lower Moons and just below the Six Upper Moons, possessed the power to hypnotize people and manipulate dreams at will, the Demon of Slumber—Nightmare.

This was also the only Lower Moon demon that had survied.

Since Rui of Lower Moon Five was defeated by the main trio and the rest of those in the rank of Lower Moon were historically vanquished by various Hashira, the Demon King, the source of all demons in this world, had recently disbanded the Lower Moons and executed most of them.

This Lower Moon One, the only surviving Lower Moon demon, did indeed have some capability.

To hypnotize the Flame Hashira and the main trio unconditionally and to merge with a train, these abilities were not something typical demons could possess.

Unfortunately, this sole surviving Lower Moon demon was now destined to fall here.

"Impossible...! I haven't lost yet...! I still have to devour everyone here...! Kill the Hashira and the little demon with the Sun Wheel Earrings...!?"

"Gaaahhhh...!"

Nightmare was struggling, causing the locomotive to roll about.

Meanwhile, Reiger had already walked over.