Isekai Adventure in the Dimensional Cube

"Hasn't he arrived?"

When these words left Ubuyashiki Kagaya's lips and entered the ears of Gyokko, Gyokko was stunned.

Then, Gyokko noticed something.

"Firelight?"

At the other end of the Ubuyashiki estate, a streak of fire, like a meteor, streaked across the sky and suddenly descended towards them under the gaze of Ubuyashiki Kagaya and Gyokko.

"What...!?"

Gyokko was shocked and quickly retracted his entire body into the pot, disappearing from sight.

The meteor-like firelight then fell like a meteorite into the courtyard of the Ubuyashiki estate.

"Boom!"

A booming sound erupted.

The firelight that fell in the courtyard created a burst of astonishing heat and flames, transforming the flames into waves of fire that assaulted the surroundings.

The temperature in the air rose rapidly.

The small bridges and streams in the courtyard were engulfed by the fire waves.

Even Ubuyashiki Kagaya, sitting on the veranda, faced a direct attack of the flames, which only split to avoid the severely ill head of the Demon Slayer Corps at the last moment, leaving small embers on the wooden veranda.

Ubuyashiki Kagaya watched all this, and the courtyard covered with sporadic embers, and let out a wry smile.

"That's rather excessive, Tsukiguni Yoriichi."

His words were met with only a faint laugh.

"I believe, at this time, not choosing to retreat and leave this residence, Family Head Ubuyashiki, is really playing with fire."

With those words, a figure emerged from the flames in the gradually fading courtyard.

"I suppose I'm not too late, am I?"

Reiger stepped through the flames, looking at Ubuyashiki Kagaya and spoke calmly.

"Naturally."

Ubuyashiki Kagaya revealed a gentle smile.

Then, the voice of a third party followed.

"...You are Tsukiguni Yoriichi?"

Such unfriendly words naturally came from Gyokko.

Quietly appearing on the courtyard wall was a pot, allowing Gyokko to crawl out of it.

Reiger then looked towards Gyokko, seeing his eyes on the forehead and mouth.

"Upper Rank Five?"

Reiger asked very calmly.

"Correct, I am Upper Rank Five, named Gyokko." Gyokko twisted his body, his small hands moving as he stared angrily into Reiger's eyes, blood vessels appearing as if agitated, "You destroy others' belongings the first time we meet, do you have a problem in your head?"

"Destroyed belongings?" Reiger was momentarily stunned and then realized what was meant, saying, "Do you mean this?"

Reiger kicked at the fragments of a pot at his feet.

"Don't kick with your feet! You barbarian!" Gyokko grew furious, veins popping on his face, shouting, "That was a pot I painstakingly crafted, it's an artwork; even if you're a monkey, you should know to respect others' art!"

"This is actually the first time I've heard that monkeys would respect others' art." Reiger responded lightly, "Moreover, the word respect is meant for humans, not for outlandish monsters. You, neither fish nor worm, before even discussing whether you have the right to talk about respect, let's talk about your so-called art, I can't see any artistic value in it."

Saying so, Reiger directly stepped on the pieces of the pot at his feet, crushing them utterly.

"Damn it!"

Gyokko's anger reached its peak instantly.

"I thought the two Upper Ranks that Lord Muzan specifically sent to investigate would be formidable figures, but it turns out you're just a stupid monkey whose brain is full of muscles, completely lacking any understanding of art or appreciation!"

Gyokko's hands suddenly produced a pot with aquatic grass patterns.

"You, an artistic dullard monkey, should disappear from this world!"

Gyokko tossed the pot into the air.

"Thousand Needle·Fish Kill!"

In an instant, the tossed pot moved.

Goldfish surged out of the spout of the pot like carp leaping over the dragon gate, jumping into the air and then spewing sharp long needles towards Reiger.

The number of needles was vast since many goldfish surged out of the small pot, jumping in the air, almost blanketing the entire courtyard above.

Thus, countless sharp needles fell down, whistling through the air, covering the entire courtyard.

Naturally, Reiger was right in the middle of it.

"Be careful!"

Ubuyashiki Kagaya couldn't help but call out a warning.

But quickly, Ubuyashiki Kagaya realized that such a warning was completely unnecessary.

"Ssss...!"

The sharp needles that fell from the sky melted away with a piercing noise as they reached about three meters around Reiger.

"What is this...?"

This scene left Gyokko stunned.

"To actually use high heat to dissolve my Thousand Needle·Fish Kill...!?"

Looking closely, the air and space around Reiger were highly distorted, occasionally showing phenomena similar to steam and mirages, indicating the extreme temperature there.

Due to the high temperature, the ground under Reiger's feet had already turned scorched black, and the goldfish nearby were instantly cooked, transforming into braised goldfish.

"What kind of breathing technique is this? I've never heard of it!"

Yu Hoe could hardly believe his eyes, shouting out loud there.

Having lived for over a hundred years as an Upper Moon among the Twelve Kizuki, Yu Hoe had fought countless battles against the Demon Slayers, including some of the Pillars.

Yu Hoe had seen many breathing techniques, whether they were used by the modern Demon Slayer Corps or not, and he had faced them all.

But even Yu Hoe had never seen any breathing technique that could cause such an outrageous phenomenon.

Melt Blood Demon Art with high temperature?

Could the Demon Slayer Corps' breathing techniques have such power?

"Tsk!"

Yu Hoe clicked his tongue, lifting the numerous little hands on his body, allowing pots to sprout out one after another.

There were ten pots in total, and all of them had sticky fish patterns on their surfaces.

"Blood Demon Technique: Ten Thousand Sliding Sky Sticky Fish!"

Yu Hoe threw the ten pots with sticky fish patterns at Reiger.

The next second, a huge swarm of sharp-toothed sticky fish burst out of the pots.

The number of sticky fish was enormous, overwhelming like a tsunami-like giant shoal of fish that flooded the courtyard and swallowed towards Reiger.

The scene of the sharp‑toothed sticky fish biting relentlessly was akin to a school of piranhas attacking from the water; once devoured, one's flesh would most likely be consumed instantly.

With such numbers and such onslaught, even high temperatures couldn't defend against everything; after the first few sharp-toothed sticky fish were charred black, the rest used the bodies of their comrades as shields and successfully reached Reiger.

However, just as the thousands of sharp-toothed sticky fish were about to overwhelm Reiger and devour him completely, Reiger moved.

"Sun Breathing·Land Form·Bone-Burning Sun."

A vortex of flames appeared.

It was a sword technique very similar to Rengoku Kyoujurou's "Vigorous Flame Serpent".

The whirling flame cut through like a vortex, scooping all the sharp-toothed sticky fish into the swirl.

"Spurt—spurt—spurt—"

The sound of the blade cutting through the bodies of the sticky fish continued to erupt, causing each fish to turn into severed bodies that fell to the ground.

Seeing this, Yu Hoe did not feel shocked; instead, a twisted smile appeared on his lips.

"My sticky fish aren't something that can be killed easily."

Few knew that Yu Hoe's Blood Demon Technique: Ten Thousand Sliding Sky Sticky Fish and the Thousand Needle·Fish Kill used by his goldfish were venomous aquatic creatures.

Thousand Needle·Fish Kill was the goldfish releasing sharp needles imbued with a paralytic neurotoxin.

Ten Thousand Sliding Sky Sticky Fish involved the body fluids of sharp-toothed sticky fish containing severe poison.

This poison could penetrate the opponent's skin and enter their body, so the more the sticky fish were attacked, the more poisonous body fluid splattered, and touching even a bit meant immediate poisoning.

Now, Reiger had nearly slain all ten thousand sharp-toothed sticky fish. Although Yu Hoe was surprised by this capability, it undoubtedly signaled the opponent's hastened demise.

"Just die from the poison here, whoosh whoosh whoosh."

Yu Hoe gloated, with a faint sense of satisfaction.

Yu Hoe completely failed to realize that after his sticky fish were slain, no matter how much fluid splashed, none could reach Reiger.

After all, the high temperature surrounding Reiger could evaporate even his Blood Demon Art, let alone mere body fluids.

Moreover, Reiger wasn't afraid of poison.

His highest-tier 'Abnormal Resistance' ability wasn't just for show.

"Bang!"

Before long, the fiery vortex-like slash completely annihilated all the sharp-toothed sticky fish, even sweeping up the ten pots with sticky fish patterns Yu Hoe had thrown, burning them into ashes.

By the time Yu Hoe realized something was wrong, the vortex of flames had already reached his face.

"Oh no!"

The smile on Yu Hoe's face froze, and the eyes on his forehead and mouth shrank to the size of pinpoints.

Reiger's figure then appeared within the flame vortex, gazing coldly at Yu Hoe, his black blade drawn at some point.

"Boom!"

Surging flames suddenly burst from the courtyard walls, blooming like a red lotus under the moonlit night.

In the midst of the red lotus, the wall collapsed, the ground shattered, and the courtyard's little bridge and flow of water were finally affected, completely destroyed by the fierce flames.

Sitting on the corridor, Ubuyashiki Kagaya watched this scene, although coughing violently, his eyes became increasingly bright.

"This power... this flame... this high temperature... too powerful...!"

Ubuyashiki Kagaya's heart trembled.

"Is this the evolved form of Sun Breathing?"

"Is the evolved form of the strongest breathing technique, which seems to purify all evils on the ground, the Red Lotus Karma Fire?"

"It's truly..."

Ubuyashiki Kagaya could find no words to describe his feelings at that moment.

"This power is clearly born to defeat Kibutsuji Muzan!"

"Kibutsuji Muzan, your end has finally come."

"It has indeed come!"