The two horned demon tried to strike Tanjiro from behind but Nezuko kicked her way out of the box and twisted the demon's neck. Nezuko ran to the other demons and hit them with her heel.

The demons went into the swamp and avoided Nezuko's attack. Nezuko tried to go after them.

Tanjiro: Nezuko!

Nezuko stopped.

Tanjiro: Don't chase him! Get back here! Come to us.

Nezuko went to them and one of the swamp demons tried to get her but she jumped over it.

Tanjiro: (Thinking: This is what Urokodaki and Y/n were talking about... Nezuko's a demon now. She's not a weakling, she doesn't need me or Y/n to protect her, she can handle herself. So maybe, she can handle this. If she can protect these two, me and Y/n can focus on the attack.)

Y/n: Sorry, Nezuko. Your brother was just a little scared something was gonna happen to you.

A swamp appeared beneath Tanjiro and Y/n's feet which caused them to step back while Nezuko dodged an attack from the two horned swamp demon.

Tanjiro: Nezuko!

Tanjiro looked at the swamp.

Tanjiro: Nezuko, Y/n! I'm going underground!

Y/n: What? Are you crazy?!

Tanjiro: Trust me. I might be able to get them from down there. You and Nezuko keep those two safe for me.

Y/n: We can do that. Can't we, Nezuko?

Nezuko nodded and Tanjiro jumped in the swamp.

Y/n: All right, let's hurry up and kill this guy, Nezuko.

Suddenly, the three horned swamp demon tried to attack Y/n, who easily blocked it.

Y/n: Oh, your that one who grinds his teeth, aren't you?

The demon started grinding he's teeth.

Y/n: That answers my question.

Nezuko and Y/n touched their backs together.

Y/n: Nezuko, you fight the one with two horns, I'll take this three horned freak.

Nezuko nodded and they went to fight their opponents.

With Tanjiro.

Tanjiro was flouting in swamp water.

Tanjiro: (Thinking: It's a swamp.)

He looked down and saw clothes flouting in the water too.

Tanjiro: (Thinking: What are those? It's clothing and stuff that belongs to the people that were taken. So many innocent victims, all murdered! It's unforgivable! Unforgivable!)

The one horned swamp demon was watching him.

One horned demon: Getting hard to breathe, yet? There isn't a whole lot of air down here in the swamp. Also, the darkness closing in on you only adds on to the weight you feel. You can't move the way you would above ground down her! You should've looked before you lemped, you stupid fool!

The demon started to swim around Tanjiro.

Tanjiro: (Thinking: You underestimate me! After all, where do you think I got my training? The air is even thinner on Mt. Sagiri then it is down here! Besides, some moves only unleash their full potential underwater!)

The one horned demon was about to strike but he sharply turned when he saw Tanjiro ready his sword.

Tanjiro: (Thinking: I guess it goes both ways, he moves even faster here. But it doesn't matter! All I have to do is slash when he gets close enough! I'll use the form that works even when I don't have sure footing... a quick and violent twist of my entire body generating an entire vortex!)

With Y/n.

The three horned demon sunk into the swamp.

Y/n: Nice try, but I've already figured out a way to defeat that. Total Concentration. Wind Breathing, First Form: Dust Whirlwind Cutter.

He used his Whirlwind Cutter, but this time it was a sky blue whirlwind, but it still made the demon leave the swamp.

Y/n: (Thinking: A sky blue whirlwind? That's new.)

Y/n ran at the demon and even when it seemed like his missed the demon's hand, the wind blade cut it off.

Y/n: Just because it seems like I missed you, don't think that you're safe.

The demon regenerated its hand and jumped towards Y/n and at the same time the one horned demon was getting ready to strike Tanjiro who smelled The Opening Thread.

Tanjiro: (Thinking: I've got the scent! The Opening Thread!)

Y/n grouched down.

Y/n/Tanjiro: (Thinking: Total Concentration! Wind/Water Breathing, Forth/Sixth Form...)

Tanjiro: (Thinking: Whirlpool!)

Tanjiro used Whirlpool to chop the demon into bits.

Y/n: (Thinking: Rising Dust Storm.)

Y/n made his upward slashes and it completely hacked the demon into pieces.

Y/n: Hopefully Tanjiro got his demon.

Tanjiro grabbed the piece of the one horned demon's clothing that had the hairpins and quickly found that it was getting harder to breathe.

Tanjiro: (Thinking: Can't breathe! I gotta get out of here!)

He began to swim up.

Tanjiro: (Thinking: Hurry!)

Back on land.

Nezuko was dodging the final demon's attacks until Y/n showed up and cut off both its arms and Nezuko punched the demon in the gut which caused the demon to cough up blood.

Two horned demon: (Thinking: This girl is powerful and this boy with the mask just defeated one of me!)

Nezuko kicked the demon away as its arms regenerated.

Two horned demon: (Thinking: Seems like neither of them picked up any skills yet, but their still so strong. He must have given them a massive amount of blood!)

He was about to go into the swamp but Nezuko ran at him and kicked the demon backwards and Y/n slashed his torso in half.

Two horned demon: (Thinking: They're so fast! And this masked brat is able to Nichirin Sword! I can't get back down into the swamp!)

The demon slowly regenerated his bottom torso and the fight continued.

Two horned demon: (Thinking: At least, I'm starting to pick up the pattern in all the girl's one-note attacks!)

He was able to block Nezuko's kick to the head.

Two horned demon: (Thinking: It doesn't matter if she can kick my head off... or if my organs explode, demons can regenerate in no time! But the masked one is the one I need to be careful of!)

The two horned demon ran at Nezuko who tried to attack it, but it blocked the attack and scratched her forehead.

Two horned demon: (Thinking: That's right! Now I'm going to drill a hole right through your face!)

He was about to strike Nezuko but Y/n split his its hand in half.

Y/n: Don't worry, Nezuko. I'll make sure he pays for that!

Two horned demon: Seems like I gotta get past you before I can get at your little girlfriend!

Tanjiro suddenly came out of the swamp and cut off the demon's regenerating arm.

Tanjiro: Hands off my sister and my friend!

He was about to strike again but Tanjiro cut off its other arm which caused the demon to fall over.

Y/n: Well, you're down. And to make sure of that.

Y/n quickly cut off its legs.

Y/n: There. Now, you can't run away.

Tanjiro: You smell horrible, you give off a scent like rotten oil. I know where it comes from. Tell me, how many people have you killed?

Two horned demon: Give me a break already! If women live too long, they turn ugly and then they won't taste good anymore! I killed them for their own good! You know, you should be thanking us-

He was cut off when Tanjiro slashed his jaw.

Tanjiro: Never mind.

Tanjiro put his blade in front of the demon's face.

Tanjiro: What do you know about Muzan Kibutsuji? Tell me.

The demon gasped and gave a look of terror.

Tanjiro: Talk to me!

Y/n: Tell us, or I'll make you wish you did.

Tanjiro: Come on, talk!

Two horned demon: I-I can't. I can't tell you. I can't do it. I just can't.

Memory.

The demon was being held by his throat by someone who's face was shadowed up.

Man: You mustn't tell a soul. No one can know anything about me. Do you understand?

The man put a finger on his mouth.

Man: Don't forget, I'm always watching you. So if you tell anyone, I will now about it.

Present.

Two horned demon: I can't. I can't, I can't, I can't!

Tanjiro: (Thinking: Now, the only thing I smell is fear. He's terrified.)

Y/n: (Thinking: He never had any sense of fear before.)

Two horned demon: I can't tell you, all right?!

The demon regenerated its arms and legs and charged at them but Y/n quickly cut off its head and it disintegrated.

Y/n: I told him I'd make him regret it if he didn't tell us.

Tanjiro: We failed to get any information, again.

They sheathed their swords and looked at Nezuko who was asleep.

Tanjiro: Nezuko!

Y/n picked her up.

Y/n: She fell asleep so she could recover her strength.

Tanjiro: It does seem like the bleeding stopped. We're sorry, Nezuko. Just hang on. I promise you this, I will make you human again.

Tanjiro open the door of the box and Y/n gently put Nezuko in the box then put it on his back. Both him and Tanjiro then looked at Kazumi who was on his knees.

Tanjiro: Mr. Kazumi? Are you all right?

Kazumi started to tear up.

Kazumi: I lost my fiancée. (broke down) How can I be all right?

Tanjiro: Mr. Kazumi. You have to go on, no matter what, despite of losing people. Even though it's devastating.

Kazumi grabbed Tanjiro's haori.

Kazumi: How am I supposed to do that?! You're just a kid, what do you know?!

Y/n grabbed Kazumi's arm.

Y/n: Listen to everything I'm about to say to you and I'll let you keep your arm.

Tanjiro: Y/n-

Y/n: No, Tanjiro. He needs to hear this. Look, I'm sorry you lost your future wife, but if she was here she would want you to live the life she can't now. And then when you reach the end, she'll be there to greet you with that warm smile you loved to see.

Tanjiro and Kazumi were taken aback by what Y/n was saying.

Y/n: Listen, I don't know what it's like to be romantically attracted to someone, but I do know what it's like to lose important people. And you're lucky that you'll be able to meet your fiancée in the afterlife. Just tell her one thing when the day comes for you to see her again.

Kazumi: What's that.

Y/n: Tell her, "I love you" and that you apologize for not being able to protect her.

Kazumi: (crying) I will. Thank you.

Y/n nodded and began to walk away.

Kazumi: I'm sorry! I shouldn't have said that to your friend! Please forgive me!

Y/n: I've already moved passed it.

Y/n closed his eyes and was getting back another memory. It was one of his young self sitting with a grown man with huge muscles, white spiky hair, sharp eyes, two scars across his face, and wearing a white haori over an open Demon Slayer Corps uniform.

Y/n: Hey, Master Sanemi. Can I ask you a question?

Sanemi: What is it, kid?

Y/n: I know that everyone except Lady Kanea hates demons, but what's the specific reason you hate them?

Sanemi: Those bastards ruined my life!

Y/n stepped back a bit.

Sanemi: (sigh) I'm sorry. I didn't mean to yell. My mother was turned into a demon which made her kill most of my siblings and made a scar on my last brother's face. And as I tried to defend him, I got these scars on my face. In the end, I was able to stop her long enough for the sun to burn her away, but my brother misunderstood the situation and thought I was a murderer.

Sanemi clenched his fist.

Y/n: Why didn't you explain it to him?

Sanemi: Because I doubt he would've listened to a thing I said. I don't know where he is now, but I hope that he'll stay as far away from demon slaying as possible.

Y/n: What's your brother's name, Master Sanemi?

Sanemi: His name was Genya.

His memory ended when he heard...

Tanjiro: Y/n? Y/n!

Y/n opened his eyes and saw Tanjiro walking next to him.

Y/n: Tanjiro?

Tanjiro: Are you okay? Do we need to take a break?

Y/n: No, I'm fine.

He looked up and saw the sun rising.

Y/n: When did the sun start rising?

Tanjiro: It shouldn't be a problem for you, you've never burned in the sun once.

Y/n: Yeah, but it still really hurts my skin.

The Kasugai Crow and Hawk flew over to them.

Crow: Head to Asakusa, Tokyo, now! Rumor has it a demon's lurking around there!

Hawk: I heard it's a really powerful one too!

Tanjiro: We've got another mission already?

Crow: Oh, yes you do!

Y/n: A really powerful one, huh? This could be interesting.

Tanjiro: Can you at least give me a minute?

Crow: No time, move it!

Tanjiro: C'mon, just give me a minute!

Hawk: Shut up and go already!

At night-time.

Tanjiro, a sleeping Nezuko and Y/n were in a big city which left Tanjiro stunned while holding Nezuko's hand.

Y/n: First time coming to a place like this?

Tanjiro: The big cities have come a lot further than I expected. It's night-time, but it's so bright out!

They began walking through the city.

Tanjiro: The buildings are so tall! What's the deal?!

Y/n: Tanjiro, quit yelling. You'll attract too much attention.

Tanjiro: I'm sorry. It just that it's so incredible and overwhelming. How come you're so calm about this?

Y/n: One of my ladies and at a different point one of my masters took me to a city like this where a Festival was happening.

Tanjiro: Well, let's go this way.

They went into an alleyway where Tanjiro and Y/n saw two people making out.

Tanjiro: (blushing) So sorry to bother you!

They got out of there and they eventually got some where it was less crowded and had fewer lights.

Y/n: That was a hassle.

He looked ahead and saw an udon stand.

Tanjiro: It's a good thing there's udon up ahead. I don't know about you, but I'm starving.

Y/n: Me too. I fucking love udon.

Tanjiro: Language.

They walked to the cart's owner

Tanjiro: Pardon me, sir. Can I a bowl of udon with yamakake?

Y/n: And a bowl of Sanuki udon for me please.

Owner: Why yes, coming right up.

As the owner was making the udon the trio sat down on a bench.

Tanjiro: I've never been to a place like this before. It's way too crowded.

Y/n: Oh, Tanjiro. It's so like you to get over worked about stuff like this.

Nezuko was tipping over and laid against Y/n's shoulder which caused him to freeze up.

Tanjiro: Y/n, are you okay?

Y/n: I-I'm fi-fine.

The owner got the finished with the bowls.

Owner: Here's your Yamakake and Sanuki udon. Let me know how you like it.

Tanjiro: Oh, thank you very much.

They took their bowls and Y/n moved his mask towards Nezuko to eat but made sure Tanjiro couldn't see his blushing face.

Tanjiro: Y/n, you don't need to wear the mask while you eat.

Y/n: (blushing) I-I've grown attached t-to this mask.

They both sipped the broth and Tanjiro started small talk.

Tanjiro: So, did you get anymore memories back?

Y/n: Yeah, I'm starting to think that with each demon I kill, I get a new memory back.

Tanjiro: Well, what was this memory?

Y/n: Well, do remember that Genya guy from Final Selection?

Tanjiro: Hmm. Oh, yeah, that guy who's fingers you broke! Yes, I remember!

Y/n: Well, he was one of my former master's little brother.

Tanjiro: Hmm.

They continued eating until Tanjiro smelled something and Y/n sensed something which made them drop their bowls. Tanjiro picked up his sword and ran too the smell while Y/n with his psychotic grin fixed his mask, picked his sword up and ran after Tanjiro.

Tanjiro: That scent! Why is it here, and why now?

Y/n: I don't care. I sense that this really is a strong demon. And when I see it, I'll kill it.

They went back into the crowd and started pushing people, but Y/n was doing it more violently.

Tanjiro: (Thinking: It's the second scent that I found at my house! Muzan Kibutsuji! It must be him, he's here!)

Y/n: (Thinking: If it is Muzan Kibutsuji, then it's sad I won't get my demon.)

Tanjiro put his hand on a man's shoulder and when that man turned around it showed he had short black hair, pale skin, blood red eyes with slide pupils and a hat.

Tanjiro: (Thinking: I found him!)

Y/n: (Thinking: Now that we found you, me and Tanjiro will kill you, you son of a bitch!)

They were about to draw their swords.

???: Daddy?

They stopped when they heard the voice that came from a little girl that Muzan was holding.

Little girl: Who are they?

Tanjiro was in shock.

Tanjiro: (Thinking: He's...)

Muzan: Don't worry, sweetie. Everything's fine.

Tanjiro: (Thinking: What is this? Is he... he's living here, posing as a human.)

Muzan: I'm sorry, is there something I do for you two? Are you all right? You both seem to be a bit flustered.

Y/n: (Thinking: I really want to kill him, but then I'll traumatized this kid.)

Suddenly, a woman walked over to them and looked at Muzan.

Woman: Darling, what's the matter?

Little girl: Don't worry, mother!

Tanjiro covered his mouth.

Y/n: (Thinking: Did Muzan really fuck this woman and have a kid? No.)

Tanjiro: (Thinking: They're human. The girl and the woman... their scent is human! But how? Can't you tell? This guy is a demon? He eats people!)

Mother: Who are these boys?

Muzan: I really don't know. I'm just as confused as you are. I've never seen them before.

Muzan without the woman of little girl noticing made his nails sharp.

Muzan: They must have made a mistake, thought that I was someone else.

Muzan quickly slashed a man who was walking by in the back of his neck, but Y/n and Tanjiro were the only ones who noticed it. The man grabbed his neck in pain and his wife looked at him concerned.

Wife: What's going on? Are you all right, sweetheart?

The man then started to turn.

Wife: You look pale.

The man who now became a demon bit his wife which made a whole scene as while the crowd looked in terror, Muzan was completely calm.

Back in the town Tanjiro and Y/n were at earlier. A young lady with pink hair and green tips, green eyes, and a Demon Slayer Corps uniform revealing her chest was talking to someone.

Young lady: Have you by chance seen a 14 year old boy with long H/c hair?

Man: Well, I did see someone with H/c hair, but it was short and the boy seemed like he wasn't much older than eleven or twelve.

Young lady: Okay, thanks anyway.

The man nodded and walked off and the young lady met up with a short young man with short black hair, a yellow right eye and a green left eye, bandages around his mouth a real white snake around his neck, and a black and white striped haori over a Demon Slayer Corps uniform.

Snake guy: Did you find anything, Mitsuri?

Mitsuri: I'm afraid not, Iguro.

Iguro: That little brat sure is making it hard for us to find him. When I find him, I'm gonna have Kaburamaru strangle and bite him.

Mitsuri: Now Iguro, master said that he wanted Y/n back alive.

Iguro: I know, but I just hope master will let me decide his punishment.
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Preview.

Tanjiro: We've found Muzan Kibutsuji. It won't be long before Nezuko's human.

Y/n: I so wanted to kill that son of a bitch where he stood.

Tanjiro: On another topic, the people in Asakusa sure are stylish, aren't they?

Nezuko agreed.

Y/n: That former master I said who took me to a city would call them mediocre.

Tanjiro: It would look great on Nezuko. Speaking of which, why did you freak out when she put her head on your shoulder?

Y/n: That's not important.

Tanjiro: Hmm. Now, it's time for a Taisho-era secret! Toyo from the udon shop was born and raised in Asakusa. I hear he keeps making udon there just because he loves the place so much.

A picture of Muzan popped up.

Y/n: Muzan!

Tanjiro: Ah, calm down, Y/n! Chapter 8, "The Smell of Enchanting Blood"!

To be continued.