Being a Demon Dad? What a Joke!!!

But--

Kai moved.

"Sixth Gate - Gate of View - Open!!"

Boom!!!

The thunderous impact tore through the forest, and scorching steam instantly swept across the entire battlefield!

The fiery red fist wind carried sonic booms and rage!

"The Morning Peacock!!!"

Kai shattered the earth with a single kick, Body Flicker Technique into the sky, and crashed down towards the center of the spider web!

Fists flashed in droves, like ten thousand peacocks spreading their tails, crimson flames and strong winds howled, transforming into heavenly fire that fell!

The spider silk was instantly severed, burned, and collapsed!

"What is this?!" Lei cried out in terror, mobilizing all the silk threads in his body to create the strongest defense!

But--

Bang!!!

Kai punched through the spider web, sending steam and fury flying, and knocked Lei Lian Gui, along with the web, directly to the ground, creating a deep crater!

"Cough... you..."

Exhausted, his body trembled. Half of his body was split open, blood mixed with white threads flowing out. He stared at Kai in disbelief. "You're not from the Demon Slayer Corps... You don't need breathing techniques, how... how could you do this?"

Before he could finish speaking, Kai jumped down into the valley, staring in shock at the pile of dead bodies on the ground, and solemnly remarked:

"Huh? These devils actually want me to be their father?"

He patted his steaming chest muscles and gave a thumbs-up:

"I'm a wild beast, full of youthful passion!!"

"Be a ghost dad? Are you kidding me?!"

As soon as he finished speaking, he kicked Lei, who was still struggling to get up, sending him flying and smashing down more than a dozen trees.

Kakashi, who was standing above, slowly walked over, glanced at Lei, and said nothing more than a low voice:

"Nailed it."

Then, looking down at Tanjiro and the others, he sighed and asked, "Are you all alright?"

"N-nothing... it's nothing..." Tanjiro was still in shock. "What... what kind of move was that...!"

Inosuke froze, his mouth agape. "W-Wow, that's amazing!! Guy-san is terrifying!!"

Zenitsu's legs went weak, and he plopped down on the ground. "Thank goodness... If it weren't for Mr. Guy... I would have been chopped into sushi..."

Kai shook his arm, which was steaming hot, and laughed, "Don't worry!! Leave the rest of the ghosts to Youth!!"

Tanjiro couldn't help but whisper to Kakashi, "Mr. Kakashi... are you two really not 'Pillars'?"

Kakashi turned his head and smiled, "We... we're just kind people passing by."

Having said that, Kai took the lead and, like a harvester, wiped out all the ghosts here.

A gentle breeze stirred, carrying away the tattered spider silk, and the entire Spider Mountain finally returned to tranquility.

The air still held the smell of scorching steam and the acrid smell of burning.

Tanjiro and the others stared blankly at Guy, whose face was practically screaming "hot-blooded," and then at Kakashi, who stood high above, exuding a low-key yet inexplicably oppressive aura. No one spoke immediately.

Tanjiro couldn't help but ask:

"Um... Mr. Kakashi, Mr. Guy, who... exactly are you people?"

Kakashi glanced at Guy, who was busy striking a pose, making a "youthful burst" gesture, his face radiating heat and his expression screaming "passion!"

Kakashi sighed helplessly, lowered his Forehead Protector slightly to cover his Sharingan, and said calmly:

We come from a very far place... extremely far away.

"Our fighting style is completely different from yours."

Zenitsu raised his hand, trembling, "What was that just now? What 'Peacock'? Was it Blood Demon Art? Or a new style of breathing technique?"

Kakashi glanced at him and said calmly:

"That is -- the 'Eight Gates Formation'."

"The ultimate technique of Taijutsu. Forcibly breaking through the eight restrictions of the body to unleash power beyond the limit in a short period of time."

"Just now, Kai used the sixth gate— 'Gate of View'."

"That power... though formidable, comes at the cost of burning one's life force."

As he spoke, he glanced at Kaina's still-steaming arm in the distance.

"... If it were someone from before, they would have died if they had opened the Eighth Gate."

Tanjiro and the others were shocked and involuntarily clenched their fists.

"Like breathing techniques, the Eight Gates Formation also rely on tempering the physical body, but its price... is more direct."

Inosuke's eyes lit up. "That sounds amazing!! I want to learn!! I want to open doors too!!"

"Hehe!! No problem!!!"

Kai walked forward laughing, rolled up his sleeves, and his arm muscles bulged like steel. "Youth belongs to everyone!! As long as you can handle it, I'll definitely teach you!!"

Before setting off, Uchiha Yoru briefly gave the two instructions.

"You may have some exposure to this world's 'cultivation system'."

"It's beneficial to us if we absorb and integrate it appropriately."

"If there are any capable individuals, we can recruit them as like-minded individuals."

As soon as Kai finished speaking, the main characters were all stunned.

After a moment of silence, Tanjiro lowered his head, his eyes filled with struggle and guilt.

"... Thank you."

"But... breathing techniques are secret skills passed down through generations of the Demon Slayer Corps, and cannot be easily taught to outsiders..."

"Even though you saved us... we cannot teach you the breathing technique without permission."

Zenitsu gritted his teeth and whispered in agreement, "... If we do that, we'll be betraying the will of our predecessors."

Inosuke frowned. "We want to teach, but we can't... it's too embarrassing..."

Kai was taken aback for a moment, then laughed heartily, showing no sign of anger whatsoever.

"Hahaha! I thought you guys didn't believe me! Turns out you're just following the rules!! This is what youth should be like!!"

He gave a sharp thumbs-up. "Adherence to rules is a true manifestation of willpower!! I love it!!"

Tanjiro gritted his teeth and suddenly raised his head.

"But--"

"We can apply to headquarters! After this mission, we'll take you to see Ubuyashiki! If he allows, we'll definitely teach you breathing techniques!!"

"Yes!" Zenitsu nodded, forcing a smile. "You saved us, we... we'll definitely repay this favor!!!"

Inosuke roared, "Take them to headquarters!! Let Ubuyashiki- sama decide for himself!! I guarantee they're good people!!"

Kakashi glanced at the group of people in front of him, his eyes flickering slightly.

He could sense the inner struggle, perseverance, and respect these children possessed.

It was a belief in "mission," completely different from many ninjas in the Ninja World who fought only for survival.

He nodded. "Okay."

"We'll go with you."

Tanjiro and the others breathed a sigh of relief.

At that moment, Nezuko poked her head out of the wooden box, looked at Kai with sleepy eyes, and yawned.

"Hmm..."

Wow, what an adorable child!!!

Kai's eyes lit up, and he bent down to touch Nezuko's head. The next second, his brows furrowed, and just as he was about to do something, he saw Kakashi next to him shake his head slightly.

"Whoosh!" Nezuko, instinctively retreating back into the wooden box and slamming the lid shut.

Kai's brow relaxed, and he paused for a moment, staring at the wooden crate. "Eh... was I too enthusiastic?"

Tanjiro scratched his head awkwardly, "No, no... she's just a little shy, Mr. Guy, please don't mind."

Kakashi calmly steered the conversation back on track. "We need to clear this mountain as soon as possible."

Tanjiro immediately became serious. "Yes, there might still be demons in the mountains. We can't let our guard down."

Kakashi glanced at him, his voice low and somber:

"During the battle just now, I discovered... the breathing techniques of this world are essentially about training the lungs and circulatory system to stimulate bodily functions."

"This method is closer to the limits of the human body than the Chakra control in the Ninja World."

He glanced at Kai, then seemed to be deep in thought:

"... Perhaps, our 'Eight Gates' can also evolve from your breathing techniques."

But he didn't say it aloud; he simply kept his suspicion to himself.

Let's go.

"The mission is not over yet; the ghosts on the mountain must be completely eradicated."

"Once it's completely safe here, we'll go with you to the Demon Slayer Corps headquarters."

"We'll discuss the exchange further then."

"Okay!" Tanjiro nodded firmly.

The wind blew across the ravaged battlefield of Spider Mountain, where the scorching steam had not yet dissipated.

But in everyone's heart, a seed called "trust" has been quietly planted.