[Reminder this is the Happy Ending]

After another day of training, it was the evening. The sunset was so beautiful that it was a perfect chance for a little nightmare to come and take that beauty away. 

I felt another presence come by and sit right next to me, it was none other than Muichiro himself. 

"What are you doing here?" he asked me. 

"The sunset." I didn't turn to look at him or anything

"The sunset what...?" I could hear the curiosity in his voice rise. Finally looking up at him I smiled and gestured for him to sit beside me. 

"You know someone back then told me something that still hasn't left my mind, it's always there somehow." When I looked back at Muichiro he seemed unfazed at the change of topic, as if he was used to this thing from me already.

"Go on...continue."

"Well there was this person that I saved from a demon, he was rather old and he told me that there was something more desperate than saying 'I want to die.'" I bit my lip ever so slightly and continued to look at the sunset.

"A more desperate saying?" I heard Muichiro question.

"He said he hadn't realized it until the time came, he told me that wanting to live was way more desperate." I shifted a little.

"Wanting to live...it really hit me." I felt his hand intertwine with mine and he responded with the softest tone that I've heard from him, "Well...life does hold a certain value to people. Tell me Y/N, would you want to keep living with the horrors of the world, or die and abandon all those hardships?"

My breath hitched as he asked the question, something that I really wasn't prepared to answer. I wasn't too sure until I felt the tears quietly stream down my face.

"I...I want to live Muichiro, I don't want to die, I want to live!" I dared to turn to him, my face all wet with tears. I probably look like such a ugly crier...

He placed his hands on my cheeks and rubbed the tears off.

"If that's the reason then...Y/N, if I end up dying to save you, I'll be fine with that." he reassured me. 

"What?! Stop messing around Muichiro!" I playfully hit him on the shoulder and he let out a laugh.

"You wouldn't like it if I died for you huh!" Idiot.

"That's different," he smiled and poked my forehead.

"How is it different!?" Laughs came from both of us, forgetting the fact that we were just talking about death. 

~Timeskip~

It was the next day after the little chat me and Muichiro had on the roof top. If I keep spending my time up there I'll be no better than Obanai.

All of us Hashira were present and the air was very...not tense but it was more awkward. 

"We should have at least two pillars guarding Oyakata-sama at minimum," Sanemi mentioned.

Gyomei had gone on to talk about how the Master wouldn't budge and give into such security measures. 

"What is this meeting for exactly?" I asked confused about the meaning of this meeting, when I could've been doing way more productive things, like bothering Giyu or something.

My brother got up and headed for the door, "It's dark out, and that's my cue to leave." I was about to reach for him but Shinobu just shook her head. Just let him leave like that?

"EMERGENCY SUMMON!! EMERGENCY SUMMON!!" Our crows interrupted.

"ATTACK ON THE UBUYASHIKI ESTATE!!"

That had stopped my brother from leaving any further and the air in the room had suddenly tensed. 

We all started running out, spreading ourselves from each other to possibly corner whoever dared to attack the Master. 

Almost all of us Hashira arrived at a walking distance, their rage being well shown by their presence.

A large explosion had appeared in front of us, with the only surviving person, or should I say demon, was one man who was regenerating at an inhumane speed, quicker than any other demon, or upper moon that I have seen.

"YOU BITCH WHAT DID YOU DO TO OYAKATA-SAMA!" Sanemi yelled.

"Oyakata-sama!"

"Master!!!"

"Oyakata-sama!!!"

It took a minute for me to process what was occurring right in front of me fully. There was a woman, another demon perhaps that I couldn't really get a good look off with all the spikes around them and in Muzan's body.

All of us had released attacks that were aimed at the Demon King, in the corner I also saw Tanjiro and the other two join in on attacking.

"Breath of Rock, Third Form: Stone Skin" I looked over to where Gyomei was, and he unleashed a series of attacks towards the impaled Muzan Kitbutsuji.

All of us had followed and unleashed our own attacks, hoping to hit at least some part of him. 

"Breath of Ice, Eighth Form: Ice Serpent" I got ready to attack, along with the other Hashira and Tanjiro.

As we were approaching Muzan, the entirety of the ground had changed into doors and rooms. What the fuck is this sorcery??

"You seriously thought you could corner me??! You're all going to hell now!" he yelled, and I fell alongside Gyomei and Muichiro.

The changing doors of the Infinity Castle had Muichiro, Gyomei, and I falling into the same room. Since Muichiro landed first he had attempted to catch me but I fell into Gyomei instead.

"Ah sorry Himejima-san," I got off quickly and bowed. He nodded his head at me and I'm guessing that was a sign saying 'it's okay' or something.

Trying to find where Muzan was hiding, we ran down the corridors of the weird building, the rooms shifting like crazy. 

Demons had tried to jump us and we had killed them in one slice. These amateur demons had way less power than those of the Twelve Kizuki. If anything they are just mere insignificant creatures.

"Worthless beings..." I muttered

"There's a lot of demons here huh," Muichiro added

"It looks like they were designed to have the strength of a lower moon, so he was planning on wearing us down." I looked at Gyomei with wide eyes. Lower moon? maybe I'm just that strong, heh.

Y/N this is no time for jokes! I thought as I shook my head.

"and Oyakata-sama?" the question had made all of us go silent.

"He most likely made himself a decoy," I said and Gyomei had silently nodded. I can see Muichiro's expression falter and it worried me.

I could see him slightly tear up, "Muzan didn't just take my twin brother but he took our second father...I swear I'll kill him...I'll show him well."

"Don't worry...we all feel the same." Gyomei's serious tone had made me shiver. 

Our crows had suddenly surrounded us and I knew that it could either be really good news or horrible news.

"INSECT PILLAR, SHINOBU KOCHO HAS BEEN KILLED BY UPPER MOON 2!!"

I let out a small gasp as the words from the crows came out. She definitely had something up her sleeve if she died to that demon.

"Shinobu-san..." I said quietly and the silence between the three of us was unbearable. 

I'm going to kill all these ugly little imbeciles!

~Flashback~

Tanjiro's POV

"Hey Y/N how did you become a pillar?" I had asked the Ice Hashira.

"I don't really remember," I saw her shrug and walk away to clean her dishes.

"Psst Tanjiro," the high-voiced words had come from Mitsuri, who had also been eating as well.

I tilted my head in confusion as she inched closer to me. Man Iguro-san would kill me right now if he saw me...

"What is it Kanroji-san?" I asked with a smile.

"Have you ever learned about that time that Y/N-chan went absolutely out of control??" I looked confused as she spoke to me.

"Huh? why bring that up-"

"SHHSHSHH," she put her finger on my mouth

"You asked how she became a pillar right? Well, this was one of the factors."

I nodded and continued to listen to her words.

"Basically she wiped out a whole gang of demons!! Just because her partner had his foot chopped off!!"

I looked at her with horror. "F-foot chopped off??!"

Mitsuri nodded all excited, "Her partner said that her bloodlust was insane! She may not show it but she cares about the slayers like no one else...and when she came back she barely remembered anything!"

I saw Y/N come back with a defeated look in her eyes, "Not you telling Tanjiro that stupid little story again..." she said and the Love Hashira had laughed it off.

"You know, Y/N-chan ranks as 4 for the strongest Hashira??" Mitsuri said and my eyes widened

"What?!"

I saw Y/N sigh and start to speak, "My emotions tend to hold me back a lot though, so bump that down to 6."

~End of Flashback~

A wall sprung out of nowhere and it pushed Muichiro and I away from Gyomei. Shit that hurt, nothing too bad though.

"Forget us Himejima-san! We can protect each other! Go!" I shouted and held Muichiro's uniform so we wouldn't get separated. 

The both of us had landed in a room that had an eerie vibe to it. There were stone pillars everywhere and my attention was focused on the single figure in front of us. 

His eyes read, Upper Moon One and his aura was menacing. I could barely move from my spot, hesitant to draw my blade. 

I glanced over at Muichiro, who had seemed to calm himself rather quickly.

That's right Y/N you have to calm down, you're a Hashira, you shouldn't be afraid.

"Your name...what is it?" he suddenly asked.

"Muichiro Tokito..."

"What does his name have to do with anything!" I blurt out,

"Silence girl!" I had an offended look on my face. At least I'm not the one with six eyes. Muichiro had come in front of me protectively.

"So the Tsugikuni name has died out then," he told Muichiro which confused the both of us.

"You are a member of the Tsugikuni family that I left behind, my child's descendant, so you are my offspring."

"Oh please! Offspring or not he is nothing like you!" I finally unsheathed my katana and pointed it at him. Oh I'm so going to die because of this. 

"Breath of Mist, Second Form: Eight-Layered Mist." 

"Breath of Ice, First Form: Frost Bite."

We had released attacks that enveloped Upper Moon One in a thick cold fog, but they didn't seem to hit him at all.

"Mist and Ice I see, good techniques." I quickly aimed for his mouth but he disappeared and vanished somewhere else. 

Why put the youngest Hashira to fight Upper Moon One?! It's like they want us to die. 

We continuously aimed attacks towards the demon and still, none heldmanaged to hit. It was like he was toying with us.

"You guys are so young and your skills are refined this much?"

I saw Muichiro getting ready to use his seventh form, which took much concentration out of him. I had to act as a defensive measure if I wanted him to get out alive with all his limbs attached. 

When I saw Upper Moon One take out his sword, I jumped in front and countered his attack with one of my breathing techniques, though he had nicked my shoulder. That's not too painful...

Countering that attack had pushed me and Muichiro a few meters back, the power of Upper Moon One was no force to be reckoned with and I knew that we wouldn't make it out of here alive if it is just the two of us.

Somebody...

It was like that for a bit, an attack from Muichiro, defense from me, it kept going until the demon had performed an attack that just about hit us in the arm and leg, we deflected most of the attack preventing it from causing any serious damage. 

"Oh? Are you guys close? You're attacking me as if you're one...let me offer something." He stood before us.

"My descendant and Girl, allow me to turn the both of you into demons so that you could be of use to that man."

Of course I wasn't going to accept, but to buy us some time I pretended to think about it. I squeezed Muichiro's hand to see if he got the memo. 

This could be the perfect time for someone to-

Upper Moon One had disappeared before us and went over to the figure whom I discovered was Genya. 

(fun fact I just used a wheel to decide Genya's fate lol I felt like Gege Akutami for a sec.)

"Genya!" the both of us shouted as he was getting dismembered right in front of our eyes. 

He's not dying...that's good. 

"Oh so you're eating demons...there was a swordsman 300 years ago who did the same thing, I have no reason to let a fake demon like you live."

"Genya No!" I was about to intervene but the presence of none other than the Wind Pillar appeared, protecting his brother. Yea as he should.

"Breath of Wind, Fourth Form: Rising Dust Storm!"

"The Wind Pillar..." Upper Moon One had stepped back.

"You got that right. I am the wind that'll rip your head off, bitch!" He had that same crazy look to him, it was sort of frightening, to say the least. 

I turned back to Muichiro and ripped a piece of my haori to use as a wrap for the injuries we had gotten. It was good that they weren't life-threatening.

I heard a sudden shouting, "HOW DARE YOU DICE UP MY LITTLE BROTHER UP, YOU FUCK-EYED BASTARD! YOU'RE DEAD!"

"Muichiro I'm going to go help Shinaguzawa-san you put Genya back together...don't give me that look I won't die! Hurry!" I saw the worried look that Muichiro gave me and it was like he was longing to tell me something. 

I joined in with Sanemi, not having to hold back as much since I didn't have to put on a defensive stance.

"Hey Shinaguzawa-san!" I jumped from overhead and unleashed my fifth-form attack.

"You brat! Don't slow me down!" I rolled my eyes when I heard that sentence coming from him. Being 2v1 didn't seem to faze Upper Moon One, or rather his name being Kokushibo.

My heart started racing as we all unleashed more and more attacks, and I could feel myself getting faster and faster. There was this burning sensation on my hand and it didn't seem to go away. 

Is this how it feels to get the mark? I guess I'm sort of feeling what Mitsuri described in the second to last meeting we had. 

I dodged an inflicting attack, barely, and jumped above and over him again. Something had changed in my eyes as well. 

Ew ew! Why can I see his organs?! I held myself back from vomiting and landed myself on the ground, a reasonable distance from the chaos. 

Sanemi and I had been caught off guard as Kokushibo had released a series of attacks, one of which was aimed towards Muichiro and Genya. I ran over to attempt to block it, Muichiro raising his sword, but I got hit in my chest area. 

I coughed out a little blood and held my chest. 

"Y/N!" Muichiro grabbed me and pulled me towards him. "Muichiro it's fine, Shinazugawa-san has that rare blood or some shit. I have to keep fighting..."

I started to walk off in that direction but a wave of pain stuck me and I stabbed my katana in the ground to help stabilize myself. 

There Sanemi was, fighting alone by himself again. "I'm going back in." Muichiro placed his hand on my shoulder, "No no wait, I can sense Himejima-san's presence coming, pretty quickly."

And just as I suspected Gyomei came in with his spikey chain ball, already attacking the Upper Moon demon. 

"More just keep coming one by one..." I heard that nasty 6-eyed demon say. 

I looked down to see Genya munching on a chunk of Kokushibo's hair that was sliced off by one of our attacks. Okay...that has to be...hard to swallow. 

Muichiro and I had once again started to attack but with the help of Sanemi and Gyomei, also Genya for whatever he decided to do. 

Kokushibo had given us a hard time with the multiple attacks that were aimed at us. Muichiro leaped in and pushed Sanemi out of the way before he could get more injured. Though, when I glanced at the ground I saw two little sausage-looking fingers on the ground. 

Someone's fingers are cut off! I looked at my hand and had a sense of relief when I saw that all my fingers were still intact. 

"Muichiro-" I was cut off when I felt a cold breeze come towards my neck, and I quickly jumped back to dodge the incoming attack but I felt a quick sensation of pain in my cheek.

He's adjusting to our quickened speed...well he is Upper Moon One. 

"Moon Breathing, Fourteenth Form: Catastrophe, Tenman Crescent Moon."

All of his curved slashes had expanded outward in every direction. It wasn't too avoidable and I know that all of us would have some sort of damage from this attack. His attack had also surrounded him, making it hard to get an opening shot. 

Once everything sort of settled down I saw that Gyomei had landed something on him and a section of his shoulder was missing. I glimpsed down a bit and I saw Muichiro there impaling Kokushibo right in his lower abdomen. 

He had a slash right across his torso, not too fatal but it caused some bleeding.

"Muichiro you dumbass get out of there!" From my distance, I could see that his blade was turning a different color. As strange as I want to believe it was, it wasn't too bad from the recent events we were experiencing. 

I ran towards him, but Kokushibo kept attacking. He's going to die if he keeps latching on to him like that!

I saw bullets from where Genya was standing it looked like he took on a new form, probably from consuming more of that Demon's...well anything!

Vines grew from out of nowhere and I struggled to find an opening to get Muichiro out, it didn't seem like he wanted to let go either. 

"Let go Muichiro!" I shouted at him once more. Gyomei and Sanemi were doing their best to get close like me, but it wasn't working. 

Upper Moon One suddenly grew swords out of him, one of them stabbing Muichiro in his upper right shoulder. Again not fatal but I need to get to him quick or else he's going to die from blood loss. 

I looked over to Genya to see if he could still fight, but he got cut up pretty badly again. 

I cut my way through his attacks, almost reaching him but I was too reckless and got hit again. 

"Fucking bullshit!" I held the wound in my arm, trying to prevent it from bleeding. 

"Y/N-chan!" I heard Gyomei scream.

I looked up to see Muichiro nowhere on Kokushibo, but his sword was still in his abdomen. Where's?

"Get them both out of here!" Two bodies had been thrown at me, one being Muichiro's and the other being Genya's.

"Himejima-san what?! I'm not running from a fight!" I protested

"Y/N listen to your superiors!" Sanemi yelled with the lack of formalities. 

"But-"

"You guys are still young, now hurry up and get out!"

I was conflicted about what to do, I didn't want to run from the fight but both of their injuries were bad and they were knocked unconscious. I knew that they were both strong and capable of defeating Upper Moon One, also with Muichiro's red sword still in there...Fine I'll do it. 

"Don't think I'll let you escape you, mere mortals."

Where am I even supposed to go?! I picked up both bodies and placed them on my back, my sword in my hand to defend once more if any attack were to come our way. It seemed like Gyomei and Sanemi is helping to distract him...

I just hope they'll be smart enough to grab Muichiro's sword after they defeat him...or IF they defeat him.

"Tomioka-san?" I looked over my shoulder to see Genya slightly regaining his consciousness. 

(i lowkey forgot if Genya calls Y/N by her last name or first name but whateverrr)

"Good your up, carry Muichiro for me? Thanks" I tossed Muichiro