[49] : Blazing Clash! Fierce Battle, Victory Secured!

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"Two people with such high fighting spirits, appearing at the same time!"

Akaza walked out slowly from the smoke, excitedly saying, "Hey, both of you should become demons!"

"I refuse!"

Jumping down from the carriage and facing Akaza, Kyojuro Rengoku seriously refused, "I am the Flame Hashira of the Demon Slayer Corps. I will defeat you here!"

"I haven't joined the Demon Slayer Corps yet, but of course, I refuse to become a demon!"

Still sitting on top of the train, Mika said casually, "After all, I just promised my teacher a while ago that I would personally cut off Muzan's head."

"Is that so? What a pity!"

Hearing the rejections from both of them, Akaza smiled and immediately assumed a fighting stance.

Although confident in his own strength, he had to take both of them seriously.

"Technique Deployment!"

"Destructive Death: Compass Needle!"

Looking at the snowflake-like technique under Akaza's feet, Mika's expression turned serious.

Although Mika knew Akaza was strong, he didn't have a detailed understanding of just how strong.

And he didn't know Akaza's methods.

Now, seeing him fight with Flame Hashira Kyojuro Rengoku, Mika was getting a detailed understanding of his strength.

"Clang!"

Akaza's arm clashed fiercely with Kyojuro Rengoku's Nichirin blade, and they began to fight rapidly.

For now, Mika had no intention of interfering in the battle between Akaza and Kyojuro Rengoku.

He thought that Kyojuro Rengoku wouldn't want Mika to interfere in this fight either.

After all, none of the current Hashira had ever faced an Upper Moon demon before.

"I see, so that's his fighting style!?"

Observing Akaza's movements, Mika gradually understood Akaza's combat style.

"In terms of physical attributes, Akaza is indeed much stronger than Kyojuro Rengoku, reaching the level of LV.3, and his martial arts skills even surpass the Flame Hashira's swordsmanship."

"And his combat style fully utilizes every bit of his advantage. The passive skills used by other demons to extend their stamina and recovery ability are actively used by him."

Seeing Akaza's arm constantly being severed by Kyojuro Rengoku's blade, Mika couldn't help but frown.

Akaza's arms being severed wasn't because Kyojuro Rengoku was stronger, but because Akaza's fighting style inherently included trading injuries.

"Akaza is indeed holding back. He's enjoying the fight with Kyojuro Rengoku."

As someone experiencing it firsthand, Mika clearly recognized Akaza's strength.

Perhaps because Mika wasn't participating in the fight, Akaza still hoped to recruit the Flame Hashira as a demon and fight with him eternally.

If it came down to a direct kill, the Flame Hashira probably wouldn't last long.

"It's a pity I don't know how to use the Red Blade."

Mika thought about the three ultimate techniques in Demon Slayer: Kimetsu no Yaiba​​​​​​​ Although he hadn't seen the entire plot, he had heard about them in comments and discussions.

The pinnacle of martial arts: Transparent World.

The pinnacle of Breathing Techniques: Demon Slayer Mark.

The nemesis of demons: Red Blade.

The so-called Red Blade is achieved by using immense grip strength or through the collision of weapons to increase the blade's temperature, turning it into a "Red Blade."

Using the Red Blade can significantly increase the damage dealt to demons, and the regeneration speed of the demon parts hit by the Red Blade will decrease.

With this technique, Akaza's regenerative ability could be severely restrained.

But the problem is, Mika doesn't know how to use the Red Blade!

Unlike the other two, which have traces to follow, the Red Blade is purely a technique.

In Yahweh's view, every move and skill contains the creator's philosophy and history.

Thus, after mastering the basic skills, Yahweh can easily extrapolate them to their ultimate form.

This is why, after Mika practiced the Water Breathing swordsmanship, he awakened the Transparent World instead of other abilities like sword aura.

Because the history embedded in the techniques is different.

Therefore, learning swordsmanship from the Demon Slayer world allowed Yahweh to extrapolate the Transparent World.

Learning Breathing Techniques allowed Yahweh to extrapolate the Demon Slayer Mark.

But the purely technical Red Blade, without knowing it beforehand, even Yahweh couldn't create it from scratch.

Of course, if Mika described the effect of this technique to Yahweh, she would probably be able to create it quickly.

But since Mika and the others had never encountered a being that could be restrained by the Red Blade, Mika hadn't considered it before.

After all, in the future, he would encounter more and more worlds, and he couldn't possibly learn every useful and useless technique.

[Mika: Gabriel, there's a technique I need your help to create. In this world, there's a technique called the Red Blade that can restrain species that are weakened by the sun. It's said that...]

[Gabriel: Understood, leave it to me!]

"It's really convenient to have Gabriel with me. Whatever technique I need, I can just ask her."

Putting down his Nen phone, Mika said with a smile.

Mika believed that once Gabriel received his information, she would soon be able to create the Red Blade technique.

Although it might not be needed now, it would definitely come in handy in the future!

"Clang!"

"Clang!"

"Clang!"

The sound of metal clashing continuously echoed, even though it was a Nichirin blade clashing with an arm.

Akaza and Kyojuro Rengoku's battle was swift and precise. They fought from the clearing into the forest and back to the clearing.

While Kyojuro Rengoku's expression was serious, Akaza was all smiles, thoroughly enjoying the fight against a high-spirited opponent.

"It looks like the Flame Hashira is in trouble!"

Seeing Kyojuro Rengoku's body starting to waver, unable to maintain stability, Mika couldn't help but shake his head.

Originally, Kyojuro Rengoku was at a disadvantage against Akaza.

Or rather, it was a battle with no chance of victory.

His only way to win was to drag the fight until dawn, using the sunlight to drive away Akaza, who feared the sun.

But during the previous train derailment, Kyojuro Rengoku had used a lot of his energy to stabilize the train and prevent injuries to the passengers.

Now, he didn't have enough energy left to safely drag the fight until dawn.

As the battle continued, he would likely sustain more and more injuries, eventually leading to his death.

"So this is how you died in the original story. What a shame!"

Putting on the disaster prevention mask given to him by Urokodaki Sakonji, Mika drew his Nichirin blade, and his aura gradually diminished until it disappeared.

"Although it's unlikely we can keep him here, let's give it a try!"

Mika's figure flashed and instantly appeared behind Akaza.

He swung his Nichirin blade towards Akaza's neck.

"After all, practice is the only criterion for testing the truth!"

---

"Dammit!"

Akaza's pupils suddenly contracted as he incredulously glanced at Mika, who had appeared behind him.

The Nichirin blade, filled with killing intent, was already at his neck.

"How did he get here? Why didn't I sense him?"

Akaza was alarmed.

Akaza's Blood Demon Art, named 'Destructive Death,' revolves around the core ability 'Destructive Death: Compass Needle,' which senses an opponent's fighting spirit, enabling a series of precise, swift, and powerful martial arts strikes.

The 'Destructive Death: Compass Needle,' the core of his martial arts, can sense the opponent's fighting spirit like a compass, making his attacks and evasions as precise as if they were magnetically attracted.

But soon, Akaza understood the situation.

"This is the ultimate domain, the Transparent World!?"

As the highest domain Akaza had pursued for centuries, he never expected to encounter it here.

Akaza's 'Destructive Death: Compass Needle' reacts stronger to opponents with stronger fighting spirits, increasing its intensity and precision accordingly.

However, if he encounters someone with no fighting spirit or who can hide their fighting spirit, his 'Destructive Death: Compass Needle' would fail.

And the ultimate domain, the Transparent World, is precisely a skill that can hide one's fighting spirit.

"Destructive Death: Leg Type, Crown Splitter!"

In this critical moment, Akaza swiftly turned and kicked upwards towards Mika's Nichirin blade.

"Clang!"

Akaza's foot collided violently with Mika's Nichirin blade.

Due to the suddenness of the situation, Akaza's kick did not exert full force, resulting in a stalemate with Mika's Nichirin blade in mid-air.

"Flame Breathing, Third Form: Blazing Universe!"

Taking advantage of the stalemate between Mika and Akaza, Kyojuro Rengoku quickly swung his fierce Nichirin blade towards Akaza's neck.

"Damn it, at a time like this!"

Facing the attack from behind, Akaza's heart became flustered.

From the previous collision, Akaza had sensed that Mika's strength was comparable to Kyojuro Rengoku's. Under normal circumstances, even facing both of them simultaneously, he would not be afraid.

But Mika's Transparent World greatly restrained him.

With his 'Destructive Death: Compass Needle' failing, Akaza had to focus most of his energy on dealing with Mika's offensive, not allowing him to act as an assassin and ambush him from the shadows.

In this situation, the Flame Hashira's attack put him in an extremely troublesome position.

"Damn it, I must take out one of them first!"

Akaza immediately twisted his body, retracting his foot.

During the turn, he repositioned himself to face the opponent.

"It seems I can't make you a demon after all! Kyojuro, I will take your life here!"

No longer holding back, Akaza kicked towards Kyojuro Rengoku.

"Destructive Death: Leg Type, Flying Planet Thousand Wheels!"

Instantly, Akaza's foot transformed into flashes of light, continuously kicking towards Kyojuro Rengoku. His kicks were so fast that they left no afterimages, and the power was overwhelming.

"Flame Breathing, Fourth Form: Blooming Flame Undulation!"

Facing Akaza's kicks, Kyojuro Rengoku immediately changed his sword technique, using the fourth form of Flame Breathing. He performed a vortex-like sword technique centered on himself, aiming to neutralize Akaza's kicks.

But unlike before, the fully-powered Akaza instantly broke through Kyojuro Rengoku's defense, kicking towards his vital points.

"He's ignoring me, planning to use his healing ability to stall me and take out the Flame Hashira first? How arrogant, Akaza!"

Faced with Akaza's choice, Mika's previously calm heart surged with anger.

"I hadn't planned on using this move!"

"But now the opportunity is too good to pass up!"

Wielding his Nichirin blade, enveloped with agile sword energy like flowing water, Mika launched an attack towards Akaza's neck.

Mika knew that in a two-on-one battle, both attacking simultaneously was the best way to maximize their advantage and overwhelm the opponent.

In this situation, if they attacked separately, it would be no different from a one-on-one fight.

Akaza, prepared for Mika's attack from behind, responded.

"Destructive Death: Empty Air Type!"

Facing Mika's slash, Akaza maintained his offensive stance towards Kyojuro Rengoku and threw six empty punches towards Mika's sword.

These punches struck the void but blasted towards Mika's Nichirin blade through the air.

"Air Type Fist?"

Mika understood Akaza's intention.

He planned to use this to block the power of Mika's slash, buying time to severely injure Flame Hashira Kyojuro Rengoku.

As long as this strike couldn't sever his neck, no matter the damage, he would immediately recover and regain the upper hand.

Six consecutive Air Type punches struck Mika's Nichirin blade, reducing the power of Mika's slash to the minimum.

In this state, even if Mika's blade hit Akaza's neck, it couldn't sever it.

"The victor is me!"

Akaza showed a frenzied smile.

In contrast, Mika smiled confidently.

"Who are you underestimating?"

Invisible and colorless aura flowed from Mika's hand, enveloping his Nichirin blade.

Under the enhancement of 'Shu,' the sharpness of the Nichirin blade increased several times.

Although the Nichirin blades in the Demon Slayer world are forged with special materials like Scarlet Crimson Iron Sand and Scarlet Crimson Ore, which imbue the blades with the power of the sun to deal special damage to sun-fearing creatures, their forging techniques are still ordinary.

Thus, in terms of material quality, disregarding the special properties, Nichirin blades barely reached the level of third-tier weapons in Danmachi world.

Using them against lower moons at the elite level of LV.2 was already quite strenuous.

Let alone using them against upper moons at LV.3.

Keeping the Nichirin blade unbroken was already a testament to the Hashiras' pinnacle sword skills.

In reality, aside from the special properties, the quality of the Nichirin blades significantly hindered the Hashiras' performance.

But now, under the enhancement of 'Shu,' the Nichirin blade, originally at the bottom of third-tier weapons, instantly elevated to a quite excellent level of second-tier weapons in terms of sharpness.

The sharp blade easily cut through Akaza's arm blocking the blade.

Then, in Akaza's incredulous gaze, it smoothly slashed through his neck without resistance.

At this moment, not only was Akaza, who had his head severed, shocked, but also Kyojuro Rengoku, who was severely injured mid-air by a kick, and Tanjiro, Inosuke, and Zenitsu, who were pressured by the three's fighting spirit and couldn't advance in the battle's periphery, were stunned.

Upper Moon Three Akaza had his head severed just like that.

Defeated!?

...

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