3rd POV. Infinity Train.

Tanjiro: What should we do, nii-san?

Sora: The demon should be around here somewhere.

Sora: But if I were the demon......

Sora: Where would I hide? How will I even manifest my victim's dreams?

Sora: There is only one place I would be.........

Sora: Tanjiro, go towards the very first car of this train.

Tanjiro: The very first car?

Sora: Yes. Whatever the demon is planning to do, we must stop this demon before this train reaches the next station.

Sora: Tanjiro, Nezuko, you two should go. I'll stay here and guard the others in any case.

Sick Boy: Uh.....

Sora: Hm?

Sick Boy: Thank you.

Tanjiro: .......

Sick Boy: Be careful.

Tanjiro: Mm.

Tanjiro: Nezuko. Let's go.

Sora: Hurry, this train is running at a high speed. Time is against us. Eliminate the demon before this train reaches the next station.

Tanjiro: Got it!

Tanjiro and Nezuko went to the next car in order to go to the objective.

As for Sora......

Sora: Maybe I should deactivate my Sharingan for a while.

He did so......

Sora: All right. I got to control my breathing and calm down.

Sora: When I used my Sharingan......

Sora: It feels like I can somehow command an individual's mind to do my bidding. Not to mention, creating illusions in the target's mind.

Sora: Is this another ability from the Sharingan? Analyzing the real world.......manipulating the world of the mind.......

Sora: Reality and illusions.......

Sora: It seems like......it's like the yin and yang. I got to ask Oyakata-sama about this. For the meantime.......

Sora: I got to wake the others but how......?

Sora: As if I can just use my Sharingan over and over again.....it will put me in a disadvantage.

Sora: If will that even work? I mean, I made eye contact when I commanded them to fall asleep.

Sora: Yeah, that won't work. They need to make eye contact with me and be conscious!

Sora: Ah, dammit! It's a deadlock! I guess the only way to get out of this is to kill the demon!

Sora: Tanjiro is taking care of it! But what about these passengers?

Sora suddenly heard Nezuko's footsteps coming towards his position.

Sora: Nezuko! You're supposed to be with Tanjiro, right? Or did he tell you to go back because it's dangerous?

Nezuko: Mm! Mm!

Sora: ........

Sora: !!

Sora: Nezuko, I have a favor to ask.

Sora: Just like you did to Tanjiro and I.

Sora: Let's wake up our friends and free them from their illusionary dreams.

Nezuko: Mm!

Nezuko began to burn both Inosuke and Zenitsu who were sleeping right next to each other.

However, on Tanjiro's side......

The moment he knew that the demon fused with the train.....

Mounds of flesh began to manifest inside the train.

Sora: Oh shit! Zenitsu was kinda right all along!

Sora: We're not heading towards where the demon is......

Sora: But we're here.......

Sora: And Inosuke screaming being inside of the "lord" of this land......

Sora: ........

Sora: Dammit all!

The flesh began to attack Nezuko but Sora rushed in with his sword and severed the flesh.

Sora: Hinokami Kagura!

Sora: Retsujitsu Kokyo!

Sora horizontally slashed the flesh to defend Nezuko who is busy waking the two demon slayers.

Sora: Just continue to wake them up! Roast them alive if you have to!

Nezuko: Mm!?

Another incoming flesh.

Sora: Hinokami Kagura.......

With a strong downward slash, Sora eliminates the flesh that is about to make contact with the passengers!

Sora: Enbu! (Dance!)

Sora: Tch.....there is no end to this.....

Sora: I also have to be careful not to hit the passengers.......

Sora: .......

Sora: That's it! Maybe!

Sora activates his Sharingan after regaining his stamina.....

Sora: That's right......I almost forgot that these eyes can observe movements, to the point that I can copy them!

A barrage of flesh is rushing towards his position.....

Sora: Flame Breathing......

Sora: First Form!

Sora: Sorry, Kyojuro. But I have to copy your movement for a while!

Sora exactly copied Kyojuro's breathing technique.

Sora: Shiranui! (Unknowing Fire!)

Sora: I guess that an easier way to learn the breathing techniques, is to observe and copy them!

Sora: All right. I have to thank and apologize to Kyojuro later on.

Sora suddenly heard the banging of the train's ceiling......

And busted a hole on the roof.

Sora: Ah, well......no need to pay for collateral damage. This is a situation where we can't even care for paying up in destroying this train.

Sora: And that voice......Inosuke......

Inosuke: Follow me, damn minions! Explosive Awakening!

Inosuke: Comin' through! Inosuke-sama's comin' through!

Sora: All right!

Sora jumped towards the hole that Inosuke created and saw Tanjiro running towards them.

Tanjiro: Nii-san! Inosuke!

Tanjiro: Can you two hear me!?

Sora: Yeah! Even with this strong wind!

Sora: Tanjiro! What happened over there!?

Tanjiro: This whole train is a demon!

Sora: That confirms our theory!

Inosuke: I knew it! So, I was right on the money!

Inosuke: That means I was a total stud as a leader!

Sora: This is no time to be singing praises on yourself!

With this knowledge, Inosuke and Sora jumped back to the hole as the tentacles of flesh are about to attack the passengers.

Inosuke: Beast Breathing, Fifth Fang.....!

Sora: Flame Breathing, Second Form!

Inosuke: Kuruizaki! (Crazy Cutting!)

Sora: Nobori En Ten! (Rising Scorching Sun!)

With the Sharingan's help, Sora was able to strike at the right moment when Inosuke unleashed his form.

Inosuke: I'll save every last one of you guys! Fall on your knees!

Inosuke: And worship me!

With Inosuke protecting the two cars......

Nezuko and Sora decided to move on to the cars behind.

The two cut through the flesh and since the flesh is just regenerating itself over and over again.

Sora: There is no end to this! How are we even going to defeat the demon who fused with this damn train!?

However, the two were overrun by the flesh, restraining both of them.

Sora: Shit! Even if I predict the movements of the flesh, if they are just that damn many, we'll be overwhelmed!

Sora: Nezuko!

Nezuko: Mmm! Mmmmm!!!!!

As the two struggles to break free from their restrains......

The sound of thunder was heard......

And the source.....

Is none other than Zenitsu who severed all the flesh that is restraining both the Uchiha and Nezuko.

Zenitsu: Thunder Breathing, First Form.

Zenitsu: Hekireki Issen! Rokuren!

With Sora's Sharingan still active, he noticed how Zenitsu unleashed his form.

He noticed that Zenitsu's breathing technique utilizes the user's legs, maximizing the output of every single muscle and blood vessel in them.

Sora: I see. So, that's how it is. Not to mention, it's like iajutsu......

Sora: All right. If Zenitsu is awake......

Zenitsu: I will protect, Nezuko-chan......

And Zenitsu somehow fell asleep again.....

Sora: Or maybe not......still anyways.....

Sora: Zenitsu, Nezuko! I'll leave this part of the train to you guys! I'll go and protect the other cars!

Sora mimics Zenitsu's stance.......

Sora: Kaminari no Kokyu - Ichi no kata.......

Sora: Hekireki Issen.......!

Sora: HACHIREN! (EIGHTFOLD!)

With the help of the Sharingan, and with the help of controlling his breathing......

Sora disappeared in a flash as he goes towards the furthest cars to protect the passengers, while severing all the demon's flesh along the way, with a improved precision and speed.

Sora: .......

Sora: Phew.......

Sora: Damn........if I didn't control my breathing, my body would sore all over.

He reached the last car of the train and it is evident on how the doors leading to succeeding cars were destroyed.

Sora: All right. With this, it would be easier to move between the cars.......

Sora: But still, eight cars.....!

Sora: Tanjiro is probably taking care of one car.

Sora: Inosuke is the same. Then Nezuko and Zenitsu are protecting the other cars.

Sora: Three cars, with me protecting the ones remaining at the rear!

Sora: But even if I went through and cut through all them, the flesh will just regenerate!

Sora: At the very least, I'll just have to slow down the regeneration with each hit!

Sora cuts through the flesh from the furthest car, and he plans on helping Inosuke, Zenitsu and Nezuko before meeting Tanjiro to devise another strategy.

Sora: *inhale* *exhale*

Sora: Let's go......

Sora: Kaminari no Kokyu.....

Sora: Ichi no kata......

Sora: Hekireki Issen.......

Sora: This time, much faster and thorough!

Sora: JUUREN! (TENFOLD!)

He rushed all throughout the cars, cutting the tentacle demon flesh along the way, moving in a zigzag pattern, an imitation of how lightning strikes.

Inosuke felt it......

Inosuke: Did lightning just—

Zenitsu: What's this!? Thunder!? It's much louder and stronger!

Tanjiro: It's much louder than before! What's going—

Before he even picked up the scent of Sora, he already appeared in front of Tanjiro to which shocked the latter.

Tanjiro: Nii-san!

Sora: Tanjiro, we need to devise a plan. About how to deal with this train demon.

Tanjiro: But how!?

Tanjiro: Even how much accurate you cut or how fast, it's endless.....

Sora: ........

Sora: Hmmmm.......protecting all eight cars is a tough job even for us.

Sora deactivates his Sharingan.

Sora: I can't keep using too much energy as well.

Sora: I just copied forms of the Flame and Thunder Breathing......

Sora: Sooner or later, I may feel the side effects of doing such without even proper training.

Tanjiro: Then, is that why you deactivated your Sharingan?

Sora: Yeah. I got to fight only using the breathing styles......

Sora: Or just accurately cutting through the flesh.

Sora: We got to find the demon's weakness.....

Sora: And usually, a demon's weakness is their head—

The train suddenly shakes as Sora kept his balance while he pulls Tanjiro's haori to prevent him from losing balance as well.

Tanjiro: What was that!? A demon's attack?

Sora: No......

Sora: That's Kyojuro. I used the sound created by Thunder Breathing to wake him up.

Tanjiro: So that louder thunderclaps......!

Sora: Yeah.

Rengoku: Young Kamado! Sora!

Kyojuro finally reached the two.

Tanjiro: Rengoku-san!

Sora: Kyojuro, you're finally awake!

Kyojuro: I'm sorry for my tardiness.

Sora: Right.....

Sora: Anyways, we're discussing on how are we going to solve this mess.

Kyojuro: Oh? Do you have a solution?

Sora: As I was saying earlier, a demon's weakness is their head. But since this train IS the demon......

Sora: As someone who worked with a train.......

Sora: It's safe to say that......

Sora: The train's.....or rather the demon's head......

Sora: Is the very front! Or in this case!

Sora: Where the fuel is being stored to power this train!

Rengoku: Hahahahahaha! Is that so! I guess it is a blessing that we have someone who worked on a train before!

Sora: So in order to stop the train, deprive it of it's power source, the fuel.

Sora: I believe that is also where the demon's neck is located!

Tanjiro: Got it!

Rengoku: Then.....!

Sora: Kyojuro, I'll watch over the remaining cars in front. Zenitsu and Nezuko are already protecting a car.

Rengoku: Then I'll go and protect the remaining five cars!

Rengoku: While Young Kamado and Boar Boy will locate the demon's head.

Sora: I'll join you part way!

Tanjiro: Okay!

Rengoku: Let's do this!

Sora: All right!

Kyojuro dashed towards the back to protect the five cars on the back.

As for the two, Sora paved the way for Tanjiro to go for the head.

When Tanjiro reached the engine.....

Sora: We'll leave the rest to you two, Tanjiro, Inosuke!

Sora protects the passengers that are still in slumber.

A scream was suddenly let out.

Sora: It came from the front!

Sora: ......

Sora: Sharingan!

Sora used his Sharingan and he saw the aura in front of him getting stronger and more sinister.

Sora: Something must've happened while we're busy protecting the passengers!

Sora: Tanjiro and Inosuke must've discovered the spot that I'm talking about!

Sora: Tanjiro, Inosuke.....!

Sora: Finish it off! Now!

Sora defends the passengers but noticed the lack of aggression on his location.

Sora: Could it be! It seems like the demon is focusing on defending their weak spot!

Sora: Then! Guess I'll help them!

Sora rushed towards the engine room of the main car and he was right. More flesh have manifested, in the form of hands and are trying to defend itself from Tanjiro and Inosuke.

Sora: Hinokami Kagura!

Sora: Nichiun no Ryu Kaburimai! (Dragon Sun Halo Head Dance!)

He unleashed continuous fast and powerful sword slashes as if a dragon is dancing.

Tanjiro: Nii-san!

Inosuke: Red Eyes!

Sora: Inosuke! Tanjiro! I'll cover you two!

Sora: Focus all of your strength in severing the neck!

Tanjiro: Got it!

The three swordsmen jumped back for now as a massive towering flesh began to grow.

Sora: Let's go!

Evading the flesh, and getting on top of the flesh to get a clear view of the spot.

Sora: There!

Sora, Tanjiro, and Inosuke cut through the towering flesh, Sora backing them up, while Inosuke severs the eye balls that appeared on the flesh, to nullify the blood demon art.

As for Sora who possess the Sharingan, the blood demon art is like nothing but a child's play. He can quickly nullify it.

Inosuke: Beast Breathing, Fourth Fang!

Inosuke: Kiri Komazaki! (Slice n' Dice!)

With the bone exposed, the demon summons flesh to attack the remaining two who are still in mid air.

Sora: Kaminari no Kokyu, Ichi no kata!

Sora: Hekireki Issen!

In an instant, all obstacles are out of the way.

Tanjiro: Thunder Breathing!? Nii-san!? But how—nevermind that! There it is!

Tanjiro: Father, please protect me!

Tanjiro: I'm going to sever that bone.....

Tanjiro: .....with this blow!

Tanjiro: Hinokami Kagura.......! 

With a 360° horizontal strike.......

Tanjiro unleashed the killing blow.

Tanjiro: Hekira no Ten! (Clear Blue Sky!)

The killing blow was dealt as the train began to shake violently.

Sora: Tanjiro! Inosuke! Brace yourselves for the impact—

Sora lost his balance when the train began to crash.

Tanjiro: Nii-san!

Inosuke: Red Eyes!

With the decapitation of the demon......

The train that it fused itself to......also crashed and threw it off the rails.