What if tanjiro reborned with all his memories and powers

Alright! I'll start by expanding the Entertainment District Arc finale and make it 10× longer while keeping the intensity and action. Here's the expanded version of the first part:

Chapter 19: The Final Clash in the Entertainment District

The battlefield was drenched in blood and exhaustion. The streets of the Entertainment District were shattered, with the echoes of battle still lingering in the air. Tanjiro stood firm, gripping his katana tightly, his breathing ragged but unwavering. Across from him, Gyutaro, the Upper Moon Six, glared with hatred, his sickles dripping with venomous blood.

"It's over," Tanjiro declared, his voice steady despite the pain coursing through his body. "You demons have terrorized humanity for too long."

Tengen Uzui, barely standing, gritted his teeth, one eye covered in blood. His missing hand ached, but his will was unbroken. "Tanjiro… you saved me from losing my arm and eye, but I won't let you fight alone."

Tanjiro shook his head. "No, Tengen-san. This is my fight. If I lose control, I need you to back me up. Trust me."

Nezuko, still in her demon form, clenched her fists. She sensed the change in Tanjiro—his presence had grown far stronger in just a few minutes. He wasn't the same boy who had first arrived in this district.

With one deep breath, Tanjiro activated Hinokami Kagura: Burning Sun Spiral, his blade igniting with golden flames. Gyutaro lunged at him, swinging his sickles with terrifying speed, but Tanjiro's movements were faster than ever. He dodged the attacks effortlessly, his sword cutting through the air like a comet.

SLASH!

In a single motion, Tanjiro sliced through Gyutaro's sickles, sending shards of metal flying. The demon's eyes widened in shock. "What?! Impossible—"

BOOM!

Tanjiro didn't stop. His next strike split Gyutaro's body in half before the demon could react. The Upper Moon let out a scream as his body disintegrated.

On the other side of the battlefield, Zenitsu and Inosuke worked together to behead Daki, Gyutaro's sister. The siblings' synchronized deaths meant the battle was finally over.

Tengen collapsed to his knees, exhaling sharply. "We… actually did it."

But Tanjiro wasn't celebrating. He turned toward the remains of Gyutaro and Daki, his gaze hardened. "Muzan knows about us now."

The other Hashiras and slayers arrived, stunned by the devastation. "This… this was an Upper Moon… and we won?"

Tanjiro clenched his fists. "This is just the beginning."

As dawn approached, he turned toward Tengen. "Rest now. You won't retire… I won't allow it. We'll need you in the next fight."

Tengen smirked weakly. "Bossy, aren't you?"

Tanjiro's eyes burned with determination. He knew the war against Muzan was far from over. But this battle had proven one thing: he was ready.

Great! Now I'll continue expanding each chapter, making them 10× longer with more details, action, and character depth. Let's move to Chapter 20: The Hashira Training Arc Begins!

Chapter 20: The Hashira Training Arc Begins!

The aftermath of the Entertainment District battle left the Demon Slayer Corps shaken but victorious. For the first time in centuries, an Upper Moon had been slain. However, Tanjiro knew this victory was only a stepping stone. Muzan would not sit idly by.

A Secret Meeting with Kagaya Ubuyashiki

The Hashiras, including Giyu, Sanemi, Muichiro, Obanai, Mitsuri, Gyomei, and Shinobu, gathered at the Ubuyashiki estate, alongside Tanjiro. Tengen Uzui, still injured, sat beside his wives, listening to the meeting in silence.

Kagaya Ubuyashiki spoke in a calm yet commanding voice. "You all fought valiantly, but this war is far from over. The battle against Upper Moon Six was only a test—Muzan is now aware of our growth, and he will retaliate."

Tanjiro stood, bowing respectfully. "That's why I propose a new plan. The Demon Slayer Corps needs to grow stronger… and quickly. We don't have years to prepare—we only have months before Muzan makes his move."

The Hashiras exchanged glances.

Gyomei, the strongest Hashira, nodded. "What do you propose, young Kamado?"

Tanjiro inhaled deeply. "I will personally train the Hashiras and Demon Slayers. At night, I will train the Hashiras in advanced combat techniques, including how to fight without relying on their breathing styles alone. During the day, I will train the lower-ranked Demon Slayers, preparing them for what's to come."

Sanemi scoffed. "You? Train us? You're strong, kid, but you're not a Hashira. You don't command us."

Tanjiro met Sanemi's glare with a steady gaze. "Strength isn't about titles. If you can defeat me, then I will step down."

Obanai smirked. "I'd like to see that."

Kagaya raised a hand. "Enough. Tanjiro Kamado, you have proven your strength. I hereby name you the first 'Demon Hashira'—the leader of a new division within the Corps. Your role is clear: prepare us for the final battle."

A stunned silence followed.

"Demon Hashira…?" Mitsuri murmured in awe.

Shinobu tapped her chin. "It makes sense. Your abilities surpass what we've seen before."

Sanemi clenched his fists, then smirked. "Fine. But if you train us, you'd better not hold back."

Tanjiro smiled. "I wouldn't dream of it."

Training Begins: The Evolution of the Hashiras

For the next several months, Tanjiro pushed the Hashiras beyond their limits.

Gyomei trained in raw endurance, pushing his physical and spiritual strength. Sanemi and Obanai learned to control their aggression, refining their attacks for precision over brute force. Muichiro awakened his Demon Slayer Mark, gaining incredible speed and reflexes. Mitsuri improved her flexibility and reaction time, enhancing her Love Breathing. Giyu unlocked the Transparent World, making his Water Breathing even deadlier. Shinobu mastered poison techniques, developing new mixtures to counter Upper Moons.

But Tanjiro's true goal was to introduce a secret technique: fighting without relying on a sword.

During a night session, he stood before the Hashiras, his blade sheathed. "Demons have one advantage over us—they can regenerate. If we only rely on our swords, we're at a disadvantage."

Sanemi frowned. "And what do you suggest?"

Tanjiro clenched his fists. "We learn to fight with our bare hands. If your sword breaks, you should still be able to fight.

Gyomei grinned. "I see… This will be interesting."

Muzan's Counterattack: The Next Target

While the Hashiras trained, Muzan was plotting.

Deep within Infinity Castle, the Demon King sat on his throne, his crimson eyes narrowed. He had lost an Upper Moon—something that hadn't happened in centuries.

Douma, Upper Moon Two, smirked. "Looks like the Demon Slayers got lucky."

Muzan's voice was sharp. "Luck had nothing to do with it. Kamado Tanjiro… he's dangerous. But they struggled against Upper Moon Six. That means they are not ready for the higher ranks. I will not hide. Instead, I will test them—one by one."

Kokushibo, the First Upper Moon, bowed. "What is your command, Lord Muzan?"

Muzan's eyes gleamed. "Send Upper Moons Four and Five. Let's see if they are truly worthy of being my enemies."

Six months later, the next attack would begin.

Next Chapter: The Swordsmith Village ARK.

After the intense battles in the Entertainment District, the Demon Slayer Corps faced a period of recovery and regrouping. Tanjiro Kamado, still healing from his injuries, received news that his Nichirin sword was beyond simple repair due to the extensive damage it had sustained. His swordsmith, Hotaru Haganezuka, had refused to forge him a new blade, frustrated by the repeated damages. Determined to make amends and acquire a new weapon, Tanjiro embarked on a journey to the hidden Swordsmith Village, accompanied by his sister, Nezuko.

Arrival at the Hidden Village

Guided through secretive routes to protect the village's location, Tanjiro and Nezuko arrived at the Swordsmith Village, a serene place nestled within the mountains, where the sound of hammers clanging against steel resonated through the air. They were greeted by Tecchin Tecchikawahara, the village chief, who welcomed them warmly.

"Welcome, Tanjiro. We've been expecting you," Tecchin said with a gentle smile.

"Thank you for having us," Tanjiro replied, bowing respectfully. "I apologize for the trouble my damaged sword has caused."

Tecchin chuckled softly. "Hotaru can be... passionate about his work. He'll come around. In the meantime, please make yourself at home."

Encounters with Fellow Demon Slayers

While exploring the village, Tanjiro reunited with familiar faces. He encountered Mitsuri Kanroji, the Love Hashira, who was delighted to see him.

"Tanjiro! It's so good to see you!" Mitsuri exclaimed, her eyes sparkling with joy.

"Mitsuri-san! I didn't expect to find you here," Tanjiro responded, smiling warmly.

"I'm here for some maintenance on my weapon. Plus, the hot springs here are wonderful! You should try them," she suggested with enthusiasm.

Later, Tanjiro encountered Genya Shinazugawa, the younger brother of the Wind Hashira, Sanemi. Genya was as aloof as ever, offering only a curt nod in acknowledgment before continuing on his way.

The Secret Weapon

During a conversation with Mitsuri, she mentioned a "secret weapon" hidden within the village that could enhance a swordsman's strength.

"There's a training device here that's said to be incredibly effective," Mitsuri whispered conspiratorially. "You should seek it out."

Intrigued, Tanjiro set out to find this mysterious tool. His search led him to a secluded area where he witnessed the Mist Hashira, Muichiro Tokito, engaged in a heated argument with a young swordsmith named Kotetsu.

"You need to let me use it," Muichiro demanded, his voice cold and unyielding.

"It's not ready yet!" Kotetsu protested, his small frame trembling with determination.

Sensing the tension, Tanjiro intervened. "Is everything alright here?"

Muichiro turned his icy gaze toward Tanjiro. "Stay out of this."

Before Tanjiro could respond, Muichiro delivered a swift blow, knocking him unconscious.

Training with Yoriichi Type Zero

Upon regaining consciousness, Tanjiro found Kotetsu by his side.

"I'm sorry about earlier," Kotetsu said, bowing apologetically. "That was uncalled for."

"It's alright," Tanjiro replied, rubbing the back of his head. "What's this secret weapon everyone is talking about?"

Kotetsu led him to a clearing where a mechanical training doll stood.

"This is Yoriichi Type Zero," Kotetsu explained. "It was modeled after a legendary swordsman from over 300 years ago."

"Incredible," Tanjiro murmured, examining the doll's intricate design.

"Would you like to train with it?" Kotetsu offered.

"Yes, please!" Tanjiro agreed eagerly.

The training was grueling. Yoriichi Type Zero was designed to push a swordsman to their absolute limits. Despite the challenges, Tanjiro persevered, his determination unwavering.

The Hidden Sword

During one intense training session, Tanjiro managed to land a decisive blow on the doll, causing it to malfunction. As it collapsed, a hidden compartment opened, revealing an ancient, yet beautifully crafted sword.

"This... this is incredible," Tanjiro gasped, holding the weapon reverently.

"It's been hidden inside Yoriichi Type Zero for centuries," Kotetsu explained. "It's yours now."

"Thank you," Tanjiro said, bowing deeply.

A New Resolve

With his new sword in hand and the support of his comrades, Tanjiro felt a renewed sense of purpose. He was ready to face the challenges ahead, knowing that with determination and the strength of his allies, they could overcome any obstacle.

Understood. Let's continue the expanded narrative from the Swordsmith Village Arc, incorporating the confrontation between Tanjiro and Muichiro.

After the intense battles in the Entertainment District, Tanjiro Kamado and his sister, Nezuko, journeyed to the hidden Swordsmith Village to repair his damaged Nichirin sword. Upon arrival, they were warmly welcomed by the village chief, Tecchin Tecchikawahara.

A Tense Encounter

While exploring the village, Tanjiro overheard a heated argument between the Mist Hashira, Muichiro Tokito, and a young swordsmith named Kotetsu.

"I need access to the Yoriichi Type Zero now," Muichiro demanded, his tone cold and authoritative.

"It's not ready for use," Kotetsu protested, his voice tinged with frustration.

Sensing the escalating tension, Tanjiro approached them. "Is there a problem here?"

Muichiro turned his gaze toward Tanjiro, his eyes reflecting annoyance. "This doesn't concern you. Stay out of it."

Tanjiro remained calm. "We're all on the same side. There's no need for hostility."

Without warning, Muichiro's hand shot out, aiming to push Tanjiro aside. However, Tanjiro anticipated the move, deftly sidestepping and gently deflecting Muichiro's arm.

Surprised by Tanjiro's reflexes, Muichiro's expression hardened. "Impressive. But don't test my patience."

Kotetsu interjected, "Please, both of you, this isn't the place for conflict."

Taking a deep breath, Tanjiro nodded. "You're right. Let's focus on our common goal."

Training with Yoriichi Type Zero

Despite the earlier tension, Tanjiro's primary objective remained: to strengthen himself for the battles ahead. He sought permission to train with the Yoriichi Type Zero, a mechanical doll designed to replicate the movements of the legendary swordsman, Yoriichi Tsugikuni.

Kotetsu hesitated but eventually agreed, recognizing Tanjiro's determination.

The training was grueling. The doll's movements were swift and precise, pushing Tanjiro to his limits. Each session honed his skills, enhancing his speed, agility, and combat intuition.

A Hidden Treasure

During one particularly intense session, Tanjiro managed to strike a critical point on the doll, causing it to malfunction. As it ceased movement, a hidden compartment opened, revealing an ancient, yet pristine, Nichirin sword.

"This sword... it's incredible," Tanjiro murmured, carefully lifting the weapon.

Kotetsu's eyes widened in astonishment. "I had no idea such a blade was concealed within the doll."

"With this sword, I'll be better prepared to face the challenges ahead," Tanjiro said, determination evident in his voice.

A Renewed Purpose

With his new weapon and the rigorous training he underwent, Tanjiro felt a renewed sense of purpose. He was more determined than ever to protect his loved ones and eradicate the demon threat.

As he gazed at the horizon, the weight of his responsibilities pressed upon him, but so did his unwavering resolve.

Understood. Let's continue the expanded narrative from the Swordsmith Village Arc, incorporating the confrontation between Tanjiro and Muichiro.

Chapter 22: Clash of Resolve

After the intense battles in the Entertainment District, Tanjiro Kamado and his sister, Nezuko, journeyed to the hidden Swordsmith Village to repair his damaged Nichirin sword. Upon arrival, they were warmly welcomed by the village chief, Tecchin Tecchikawahara.

A Tense Encounter

While exploring the village, Tanjiro overheard a heated argument between the Mist Hashira, Muichiro Tokito, and a young swordsmith named Kotetsu.

"I need access to the Yoriichi Type Zero now," Muichiro demanded, his tone cold and authoritative.

"It's not ready for use," Kotetsu protested, his voice tinged with frustration.

Sensing the escalating tension, Tanjiro approached them. "Is there a problem here?"

Muichiro turned his gaze toward Tanjiro, his eyes reflecting annoyance. "This doesn't concern you. Stay out of it."

Tanjiro remained calm. "We're all on the same side. There's no need for hostility."

Without warning, Muichiro's hand shot out, aiming to push Tanjiro aside. However, Tanjiro anticipated the move, deftly sidestepping and gently deflecting Muichiro's arm.

Surprised by Tanjiro's reflexes, Muichiro's expression hardened. "Impressive. But don't test my patience."

Kotetsu interjected, "Please, both of you, this isn't the place for conflict."

Taking a deep breath, Tanjiro nodded. "You're right. Let's focus on our common goal."

Training with Yoriichi Type Zero

Despite the earlier tension, Tanjiro's primary objective remained: to strengthen himself for the battles ahead. He sought permission to train with the Yoriichi Type Zero, a mechanical doll designed to replicate the movements of the legendary swordsman, Yoriichi Tsugikuni.

Kotetsu hesitated but eventually agreed, recognizing Tanjiro's determination.

The training was grueling. The doll's movements were swift and precise, pushing Tanjiro to his limits. Each session honed his skills, enhancing his speed, agility, and combat intuition.

A Hidden Treasure

During one particularly intense session, Tanjiro managed to strike a critical point on the doll, causing it to malfunction. As it ceased movement, a hidden compartment opened, revealing an ancient, yet pristine, Nichirin sword.

"This sword... it's incredible," Tanjiro murmured, carefully lifting the weapon.

Kotetsu's eyes widened in astonishment. "I had no idea such a blade was concealed within the doll."

"With this sword, I'll be better prepared to face the challenges ahead," Tanjiro said, determination evident in his voice.

A Renewed Purpose

With his new weapon and the rigorous training he underwent, Tanjiro felt a renewed sense of purpose. He was more determined than ever to protect his loved ones and eradicate the demon threat.

As he gazed at the horizon, the weight of his responsibilities pressed upon him, but so did his unwavering resolve.