At night,

At the foot of Natagumo mountain,was a black haired youth running as fast as he could.

"I have finally arrived at Natagumo mountain,here as long as I don't die and kill and strong demon or two,I will have a chance to be in butterfly mansion,there I can practice 'total concentration breathing:constant' Thinking that Harada couldn't help feel excited.

After a few minutes....

Harada had entered deep into the forest of Natagumo mountain.

He saw bodies of demon slayers everywhere.

"It seems like the mother demon has already been killed" Harada thougth.

Even though he had forgotten most lf what had happened in the anime,but his information about what happened in the major arcs of the series were still somewhat clear.

"Then I should hurry!" he started running faster after thinking that.

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

At another place on Natagumo mountain,

Two people were running in the direction of south.

These two were,of course,Tanjiro and Inosuke.

Inosuke had used his "Beast's breathing:Seventh Form: Spatial Awareness"

This breathing form let him sense everything throughout this entire mountain if given enough time.

Beast Breathing is a Breathing Style that mimics beasts and wild animals, specifically their unpredictable and wild nature, including movements, attacks and senses, and replicates it with the user's movements, techniques and abilities.

Most, if not all, known techniques and forms are simple, straightforward yet wild, unpredictable and animalistic movements and attacks, although one of them, utilizes the powerful sense of touch to replicate an animal's primal senses.

Inosuke had sensed a demon nearby so he and Tanjiro were going there to kill it.

After a few minutes...

"There it is" Inosuke said.

This Demon was, physically, the largest of his "Family". His skin was dark brown with the same red, dot-like design extending from his shoulders reaching down to his arms as other members of his family.

This was spider demon:father.

His most unique trait was that his face resembled that of a gigantic spider with several eyes and spider pincers in both of his cheeks.

"He seems to be a worthy prey for me!" Inosuke bravely shouted and pounced at the demon to attack him.

"Second Fang: Slice" Inosuke shouted as he unleashed a double slash with his two blade in a 'X' shaped cut.

*clank*

A sound akin to that of hitting steel resounded.

"Water's breath: Fourth Form: Striking Tide"

As Tanjiro said this,the demon looked at him and tried to attack him with his claws,but at the crucial moment Tanjiro started twisting his body in a certain rythm and started striking the demon with his blade with simultaneously.

*clank* *clank*

The demon suffered minor injuries yet it managed to puch at Tanjiro's balde.

Due to the sheer strength of the punch,Tanjiro was blow 5 m away.

"Oi,konjiro!"Inosuke shouted, "this is my prey,you go get the other demons!" he saod while dodgeing the demon's hits.

"Okay!" Tanjiro said this as he started running forward.

..........

Natagumo mountain,

In the forest area,

There was a black haired youth,wearing a standard demon slayer uniform.

This youth was Murata,previously,he had seperated from Tanjiro,Inosuke and Zenitsu.

Right now,he was checking his surroundings to see if there was any demons.

Suddenly!

He heard some noise from behind.

It was a demon,a female demon.

"Die,demon!" Murata shouted as he striked at the demon.

"hmph" The demon scoffed as she used her blood demon arts and cover Murata with her acid webs.

"Eh,what are these webs" Murata was frantic as he tried to cut the webs,but It didn't work.

"My webs can't be cut,you will be in there until you are completly dissolved by my acid."

As soon as she said this,she heard a sound,sound of someone running towards her.

As she turned her head to clear her doubt,

She saw a dark blue blade.

Her head was sliced.

She was killed in an instant.

As her head fell to the ground and her body started to turn to ash,she tried to look at the one who killed her.

It was a man.

He had black hair,he wore a black haori.

Currently he was preparing to slice the web in which Murata was trapped.

"Water's breath:first form:water surface slash"

*Shii*

He cut he web in two halves in just one strike.

But it was nothing too great.He had killed the female spider demon.

The web created by her blood demon art also weakened as she started dying.

"Wh-who are you?" Murata asked in disbelief.

The black haired boy replied with a smile...."My name is Kamado Harada."

"You should stay in this area for now,you are injured" Harada said as he pointed at Murata's arms.

"Ah,you're right,the acid has nearly dissolved skin around my arms,but now I should be safe as she is dead and the acid has dispersed" Murata analysed his situation.

"Okay,stay alive!" As Harada said this,he started running while making nearly no sounds.

He had now killed one of Rui's minions.

He wasn't going to kill Rui as he may not be ready for that yet.

He was going to kill the demon whom Inosuke was fighting.

After running for a while,Harada could now hear the sounds which somewhat sounded like a blade hitting an iron wall.

After he took a few more steps he saw Inosuke fighting that demon.

.........

"Die,prey!" Inosuke shouted as he striked simultaneously with his dual blades.

The demon now had countless small cuts on it's chest and abdominal area but they were recovering at rapid speed.

The demon clenched it's fists as it started punching Inosuke.

Inosuke dodged the demon's attacks.

The more Inosuke attacked the demon,the more fatigued he got,yet the demon was nowhere near being tired.

"I'll hunt you down,just you wait!" As he said that,Harada jumped from behind and slashed with his blade at the demon's neck.

*clank*

The sound of a blade hitting an iron wall resounded.

"Oi,is that you kojiro?" Inosuke asked in amazement.

"No,I'm not,and now isn't the time to introduce myself" Harada said as he got away from the demon.

"Focus on killing the demon" Harada said in a voice full of authority.

"Third Fang: Devour"

"Fourth Form: Striking Tide"

Harada and Inosuke shouted in unison as they rushed to kill the demon.

*clang*clang*clang*

They both attacked the demon simultaneously,the demon now had tens of small cuts and a big cut on it's neck which was rapidly recovering.

The father spider demon shouted "Metamorphosis"

At once,the father demon's body size doubled,he was previously 6 feet tall but now 9 feet tall.

The Father Spider Demon possessed the ability to shed his outer skin in order to transform into a more powerful form with increased physical power and regenerative abilities, making him even stronger and durable than in his original form.

Just as Harada and Inosuke were noticing the changes in it's form,the demon puched them both with full power.

In an instant,both Harada and Inosuke used their blades to defent themselves.

But the blades weren't able to defend them.

They were both hit by the punch,their swords had absorbed most of the force yet just with the remaining force of the punch,they were both sent 8m away flying.

Sounds of bones crackling couldbe heard,the demon's previous attack broke Harada's left arm and Inosuke had even suffered some internal injuries.

The most concerning point was that Inosuke's blades were now half broken and Harada's blade now had a few cracks.

"Argh,it hurts!" I screamed internally

"I shouldn't have underestimated this demon,but....This feels great,a life or death battle was something I had always wished to have!" at this moment,Harada was experiencing an adrenaline rush.

He grabbed his balde with his right arm.

He got up.

Regulated his breathing,and pounced at the demon.

As Inosuke saw this,he also could feel the adrenaline rush in himself.

"Demon,you will be my prey,I will hunt you down,I swear!" Inosuke shouted as he pounced at the demon as well.

"Fourth Fang: Slice 'n' Dice"

"Sixth Form: Whirlpool"

"Sixth Fang: Palisade Bite"

"Tenth Form: Constant Flux"

A torrent of attacks filled the demon's vision as Harada and Inosuke used all their techniques,fighting with all their might.

...........

For the next entire hour,Harada and Inosuke didn't stop even for a moment as they striked with all their might.

At this point,both of them didn't feel any kind of pain,instead,with every second,their speed at which they were attacking increased.

"Ah,this feeling,it's something different,I can feel my body getting faster and faster with every passing second passing,yet I can also feel the weight of boulders in my blade." This thought subconsciously came in Harada's mind but he didn't pay any heed to it.

As time went by,Harada stopped using any form of water's breath,instead,he was attacking based on pure instinct as the weight of his balde increased

It was the same with Inosuke.

The cracks in their blades didn't matter.

The pain didn't matter.

Breathing techniques became an instict.

Inosuke striked fiercely at the demon's arms.

After a few strikes,the demon's arms were cut completly,it was like cutting a wooden log with a kitchen knife.

Then at that moment,Harada striked at the demon's neck with full force.

It was as if his blade had the same torrential force of a lake as he cut the demon's neck.

Blood was splattered everywhere.

And the demon was dead.

As soon as the fight ended,both Harada and Inosuke collapsed on the ground.

To be continued....