You and Zenitsu fight the tentacles for a couple of minute now. Once in a while you saw Rengoku pass through the both of you towards the front car. So you know that he just told your brother to take the demon out while the three of you are protecting the passengers.
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Moments later you were shocked at the sudden scream md wildly shaking throughout the whole train. 'This... Big brother just defeated Enmu'.

Soon after you found yourself holding on the passengers not to be flung all over the place because the train is now crashing. You got a glimpse of Rengoku doing a bunch moves just to leesen the impact of the crashing train.
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You didn't notice that you just lost your consciousness
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Meanwhile...

Tanjiro continues to breathe heavily. Rengoku appears before him."I see you've mastered Total Concentration, Constant! Impressive!""Mr. Rengoku...""After all, Constant is the first step toward becoming a Hashira. Although, there might be10,000 steps before you can become a Hashira.""I'll do my best..." Tanjiro said.

"You're bleeding from the abdomen. You have to concentrate and improve the precision of
your breathing.Make your nerves reach every corner of your body.There's a blood vessel. A torn blood vessel.

Tanjiro continues to breathe heavily.Rengoku Concentrate harder.Tanjirou closes his eyes. In his concentration, he finds the torn blood vessel. "That's it. Stanch it. Stop the bleeding." Tanjiro's blood continues to flow. Rengoku pokes his forehead."Focus."Tanjiro focuses again. The bleeding stops, and Rengoku stops poking Tanjiro's forehead."Haa...""Great! Looks like you stopped it.You'll be able to do all kinds of things when you master breathing.Not that you'll be able to do everything, but you'll become a stronger version of yourselfthan yesterday for sure." Rengoku said

'Everyone is safe! There are hordes of injured people, but no one's life is in danger.
Don't strain yourself. Take it easy and rest up." Rengoku said. "Thank you very much." Tanjiro said.

When suddenly someone arrives at the wreckage of the Mugen Train. His presence is heavy. Rengoku turns to this unknown demon ready to draw his sword. Tanjirou struggles to see the demon but sees thathe is Upper Rank 3. "Ahh... Ah!" 'Upper... Three? What's he doing here right now?' Tanjiro thought

The demon launches forward and prepares to punch Tanjiro in the head but Rengoku related fast 'Flame Breathing, Second Form!'Rengoku slices through the demons arm. 'Rising Scorching Sun!'The jumps back and fuses his arm back together instantly. 'That's a fine sword.' He said

'He sure can regenerate fast. This heavy and overwhelming demon aura...So, this is an Upper Rank.' Rengoku thought"I can't understand why you'd go after a wounded person first." "He could get in the way of the chitchat between you and me." The demon said"What would you and I have to talk about? I'm meeting you now for the first time, but Ialready dislike you."

"Is that right? Well, I loathe weak humans, too. The sight of a weakling makes my skin
crawl.""Then it looks like our senses of value are completely different." Rengoku said"All right, then I have a brilliant proposal for you.Why don't you become a demon, too?" "I will not.!" "I can tell your strength at a glance. You're a Hashira, aren't you?Your fighting spirit has been honed to the hilt. It's close to the realm of the highest."

"I'm the Flame Hashira, Kyoujurou Rengoku." "I'm Akaza." The two said telling each other's name.

"Kyoujurou... Let me tell you why you can't enter the realm of the highest.It's because you're a human. Because you're going to grow old. Because you're going todie.Become a demon, Kyoujurou.Do that, and you can go on training for a hundred, for two hundred years. You can
become stronger."

"Both growing old and dying are part of the beauty of being an ephemeral creature like a
human.The fact that we grow old and die is what makes human life so unbearably precious and
noble."Strength" isn't a word used to describe just the body.This boy isn't weak!Don't insult him.I'll repeat it as many times as it takes. You and I have different senses of value.No matter what the reason, I will not become a demon!

"I see..."

Akaza plants his foots into the ground. A snowflake pattern appears below him."Technique Development... Destructive Death, Compass Needle!...If you refuse to become a demon, I'll just kill you."Akaza runs toward Rengoku. The two become locked in battle.
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"Ngh!.. " 'what happen is everything alright' you slowly get up and carefully lay down the passengers you hold throughout the whole train crahing thing. Then you immediately came into realization. 'What time is it ' you look at the horizon and saw that the sun is still far from coming out then it means that the fight between Akaza and Rengoki is happening right now

"Mmm... " you started to became nervous 'calm down self. No matter what happens we need to stop it..... I REFUSE FOR HIM TO DIE.... NOT ON MY WATCH!! '

You immediately run towards in the front side of the wreckage train since you know that is where the place where the unforgettable last scene happened the scene that made even a guy to cry.
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"There were never any Flames among all the Hashira I've killed until now!And no one ever took me up on my offer, either." Rengoku blocks an attack from Akaza, his sword cutting into his wrist."Why do you think that is? As a fellow martial artist, I just don't get it.Not when only the chosen ones can become demons!" Akaza moves to punch Rengoku, but Rengoku slices through his arm.

"Ngh!" Akaza's arm regrows and punches at Rengoku. He blocks the attack. "Watching the hideous decline of someone blessed with extraordinary powers... It painsme! I can't bear it!Die, Kyoujurou... while you're still young and strong."Rengoku slashes at Akaza, but he dodges and distances himself. "Destructive Death... Air Type!"Akaza punches the air. Rengoku watches his surroundings, and Akaza's attack hits his sword,knocking him back slightly.
"Ngh..."'I see.' "Flame Breathing... Fourth Form. Blooming Flame Undulation!" Rengoku unleashes his attack, blocking Akaza's attacks.

Rengoku changes his stance and rushes toward Akaza in an instant.Rengoku slices at Akaza, but he dodges the attack." This superb reaction speed of yours..." "Urahh!" "... and these breathtaking sword skills will be lost, too, Kyoujurou!Doesn't that make you sad?!"

"It happens to everyone! It's a fact of life for any human!" Inosuke arrives near Tanjiro. Tanjiro tries to get up to help Rengoku. "Stay where you are!" Rengoku yell"If that wound reopens, it'll be fatal!
Stand back! That's an order!"

"Don't bother with that weakling, Kyoujurou! Come on, give me your best shot!Concentrate on me." Akaza said

On the sideline you arrive at the scene. You approach Inosuke and your brother. You removes your muzzles and speak "are you alright big brother" you said that catch their attention "ahh!! Nezuko!  What are you doing here" "I'm fine brother let me see your wound. I'll patch you up" you said while still observing the fight between the upper moon and the pillar to know .

"Come one brother!!...I know you are worried about Mr. Rengoku and I assure you brother I'll help him but I need to look at your wound first. "Nezuko..." And you gave him a reassuring nod he nods back and you start attending to his wound as fast as you can.
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Rengoku cuts into Akaza's arm but doesn't cut through it.

"You still don't get it?! If you continue attacking, you're just getting closer to death Kyoujurou!"Urahhh!"Rengoku and Akaza continue exchanging blows. Akaza punches past Rengoku's head, but theattack still gives Rengoku a cut on his forehead. "Ah! Ngh..."  'Flame Breathing, First Form! Unknowing Fire!' Rengoku cuts through both of Akaza's arms in one attack, but they regenerate instantly. Akazacontinues his attacks, and Rengoku goes on the defensive.

"It would be a shame to kill you now You haven't reached your physical peak yet!" Akaza lands a punch to Rengoku's ribs."Gah... Ngh...Second Form... Rising Scorching Sun!" Rengoku attacks again, but Akaza dodges. Akaza goes on the offensive.

"In a year or two, you'll have polished your skills even more and reached great precision!" "Ngh..." Rengoku blocks Akaza's attack, but Akaza gets past the block and hits Rengoku's left eye. "Ngh!" Rengoku regains his footing and goes on the offensive.

"Ngh... Third Form! Blazing Universe!Fourth Form! Blooming Flame Undulation!"

"Destructive Death..."

"Fifth Form... Flame Tiger!"

"Disorder! Hahaha~!Kyoujurou!"

Rengoku cuts through Akaza's arm, and Akaza distances himself again."Ahh... Did he do it? Did he win?!" Inosuke said

Rengoku's blood drips to the ground.Akaza's arm regenerates instantly. Rengoku breathes heavily.

'Don't tell me... No way!' Tanjiro thought while looking at Rengoku from the sidelines. "Brother..." You called but because he was so caught up on the fight between the two "brother!!" You called again he then look t you with worried eyes "Nezuko...Mr. Rengoku.. .he. ." "I know... Can you move now" your brother then look at his now patch and bandaged wounds "y...yeah I think I can" your brother said.

"When times comes please remember that I am demon now, any wounds that I have can be healed so don't worry OK" "Nezuko?" "I'll go help Mr. Rengoku and when you think you can back me and Mr. Rengoku up do it ok, I'm still scared in sunlight.

"Alright Nezuko, I'll trust you but be careful ok" your brother said. And you gave him nod.

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That's the end of the chapter 13.
Hope you like it!!