And here's the second chapter for this update. As I said, Sagittarius is a quicker updated story than this one. Anyways, enjoy~

Ulttoanova: Not a problem! Nichirin blades are kinda like Zanpaktou in the sense that they are specialized blades for supernatural slaying, but the similarities stop there. Stated in the extra notes of the manga, the flame, water, lighting, etc. effects that are seen and used by the Demon Slayers are just illusions. Nichirin blades are forged out of a special combination of material (that I don't have memorized) and are the only weapons that can kill demons. Granted, there are exceptions: demons and kill demons, it seems, and Himejima doesn't exactly use a sword, but nonetheless, that's the overall premise of the importance of Nichirin blades. Now, in this fic, this doesn't apply to Musashi. She's almost a servant, so she has access to the abilities she would if she were— sword beams and that shit, also her Phantasm— and Myoujingiri is obviously not a Nichirin sword. Myoujingiri is another exception to the "Nichirin Blades and cutting the head off" rule to kill demons. Now, could a Nichirin Blade kill a Hollow? No. That's a fic for someone else to write, ahaha.

Miyamoto Musashi, by all rights, should be dead. She knew this and she had accepted it. But to suddenly open her eyes up in the middle of a forest with her lungs burning and somehow repairing themselves from the damage the smoke did to them? She had been thrown off.

And to find that all her other minor injuries, all the rips and tears in her clothes, and the chips in the blades she used were all fixed?

She had been startled.

She had been even more startled to find that a cloak and kasa that fit her were lying in the snow next to her with Old Man Muramasa's sword and her eyepatch. Her right eye was still damaged, but she didn't feel a scar there. The blindspot certainly would have been a problem to a normal person, but she had never been that normal. It wasn't fully blind, after all. When she reached Zero she had felt it— the power of the grail that merged with her all those years ago had started to settle.

When she had woken up in the snow in whatever world this was, she was right on the cusp of being a true Servant.

In short, her new day had started with many surprises.

She first needed to figure out what time period she was in. That wasn't going to be too hard since clothing often changed over the years. And if it was after the Warring States Era, then Edo or Tokyo would be the capital. Once she figured that out, she could hopefully figure out what to do next.

Musashi had made her way down the mountain in the deep blue colored cloak and with the kasa on her head after she came to her bearings. Her five swords were all accounted for, strapped securely onto her waist and back, and she could feel that despite perfecting her swordsmanship, she was itching for a fight again.

She had initially not known what to do after she reached Zero, but she figured that if she was here, then there was a reason for her to be. Maybe she could go even farther? She couldn't go past Zero, but maybe could work on perfecting another's swordsmanship?

That Kojiro's fighting style was certainly interesting. Reaching Infinity in order to beat Zero?

Imagine the possibilities!

That was what Musashi had been thinking when she reached the village overrun by Demons. She had known without needing any confirmation that those who were killing and feasting on the villagers that they were Demons.

Of course, they didn't have the same red eyes like the Demon Swordsmen, but they did have karma— it felt different as if it was a tie to something else, but it was karma all the same. The demons had claw-like nails and blood running down their chins, but even if they were human Musashi wouldn't have let them off easy.

She hated one-sided slaughter, after all.

It was almost disappointing how easily three of the four demons in the village fell. The fourth, a child, she supposed, was a bit harder. But not by much. It had attacked her from the side, aiming to enter her blind spot but she had easily predicted as such and turned to face it head-on. It had the number six printed in one of its eyes, but she barely took note of it before its head was cleaved clear off its neck.

It wasn't even as strong as Hozoin.

She had then searched the houses for survivors, and upon finding none, she had moved to bury the bodies before the smell of food made her stop. She prayed that the spirits of the house and village forgave her for eating the food of a deceased family before burying the bodies.

Then he had burst in.

She had sensed him before he had even stepped into the house while she was eating. He had a strong presence, but it was warm and full of kindness.

When he burst in, she knew he was going to attack, so she drew her blade and leaped first.

He was… all yellow.

Well, that wasn't true, but his hair was like golden flames. His eyes were two-toned like hers, though more pronounced. Golden with a ring of red. His smile didn't leave his face when she let up.

He was powerful too. Like a flame just simmering under the surface.

And then she discovered he was loud and was reminded of Ritsuka. She wondered if there was any way he was related to the confidant redhead.

Probably not, since she was in a whole other dimension.

He had prodded and prompted her for information, which she gave to him and she had laughed at his reaction to her name.

She certainly wouldn't have been the Miyamoto Musashi he would have known, anyways. Or at least read about.

Almost every other place she went to, Miyamoto Musashi was a man.

Then he offered her to come with him to meet the Demon Slayers. She didn't know that people who hunted demons got a fancy name, but that was pretty cool to learn.

She had accepted, of course. He had promised that she'd get to fight strong people and hopefully that also meant she got paid so she could eat good food.

He introduced himself as Kyojuro Rengoku and she decided that she liked him already. They talked as they walked down the mountain, learning about one another at the surface level. He liked sweet potatoes, which was funny to her but who was she to judge?

She had learned that she was in the Taishou Period and that unlike other dimensions she had been Spirited Away to, Grail Wars and Magic were unknown to the supernatural world, and Rengoku only made a funny face when she probed about it, so she dropped the topic. She found it odd, as this world was more overrun by Demons than the last. Like some sort of major epidemic. She wondered if it spread outside of Japan, but Rengoku said he didn't know if it had or not.

They ended up both agreeing that they hope it hadn't.

…

…

And all of that had happened only a few days ago. Getting down the mountain hadn't been too hard, but getting back was a different task. They had walked for another day, encountered another Demon (Rnegoku dealt with it in under three seconds), and the Flame Pillar fell into a bramble patch not even ten seconds after.

Despite all of that, though, Musashi didn't feel overly tired as she stretched, following Rengoku to meet this 'Oyakata-sama' that he kept referring to.

They were the boss, then?

She wasn't sure as she walked around the outside of an estate and into a garden. The Garden was beautiful, she had to admit, but she wasn't sure what else she expected.

There were two children playing with a ball in the garden, twins it seemed. They both had stark white hair and pale skin— eyes that seemed to see right through her when they looked over. Rengoku waved to them, and they smiled before they went back to playing with their ball.

"I'm glad you made it back safely, Rengoku," a soft voice said and she turned, seeing a man with black hair sitting on the engawa. A large scar went across his forehead and face, and sightless eyes gazed in their general direction. Her senses prickled slightly and she felt it— karma. Or at least, that's what it felt like. The man before her had something that felt like karma rolling off of him, faint, but there. Demonic blood, perhaps? Diluted to the point where it was next to untraceable?

She wasn't sure as Rengoku kneeled in respect to the man. Musashi slowly followed suit.

"I can assume you got my message, Oyakata-sama?" Rengoku asked and the man hummed, nodding.

"Yes, I did," he said simply, "The person next to you, then? That's her, the one who goes by Musashi?"

"That's me," Musashi hummed, nodding a bit. "Nice to meet you, Oyakata-sama!"

The man gave her a gentle smile as he folded his hands in his lap.

"You may call me Ubuyashiki, if you wish. Only the Corps call me Oyakata," he told her gently before he tilted his head slightly. "Kyojuro says you killed a Lower Moon Demon by yourself," he started, "Along with three others."

Musashi frowned, running a hand through her hair. "I mean, yeah, I did. Demons are Demons. Unless they prove otherwise, they're a natural threat to humans. I can count on one hand how many haven't been direct threats to humanity," she said before she sighed, shaking her head. "Anyways, I suppose that Rengoku told ya about my, ah, Time Traveling?"

The man nodded and she took it as a sign to continue.

"Sorry to lie, but it's not exactly Time Travel. Until I figure out if someone's trustworthy or not, I just let them chalk it up to that," she said, ignoring another huff from Rengoku.

"In truth, it's something a bit more… convoluted. More like… dimension-hopping," she explained, "Where I'm from and where I was previously, I fought beings known as Demon Swordsmen, and they took the forms of impressive heroes from long ago. Fighting a Demon like that after beating the Shuten Douji?" she shook her head again. "It wasn't much of a fight."

Ubuyashiki was very good at recovering from shock, Musashi decided. The name 'Shuten Douji' was universal when it came to talking about demons, it seemed, but the man quickly calmed his features from startled to quizzical. Rengoku was less schooled, his head turning to face Musashi and eyes wide.

"There is one more thing," she continued, eyes still gazing evenly forwards at Ubuyashiki. "I don't just 'call' myself, Musashi, it's who I am. I recognize that in almost every other world the person known as Miyamoto Musashi was, and is, a man, so I understand if that is hard to believe. I am not the same Musashi that you have heard of in legends, but I am the same Musashi who created duel wielding in a more fluid form."

She broke her gaze from the man as she bowed in her kneeled form. "Rengoku said that you were Demon Slayers. There are three things that I find unforgivable, and Demons always manage to do them, no matter what world I'm in. I'm not sure what sort of trial you have people do, but I'm more than willing to do it if it means that I can join you in slaying Demons for the time I'm here."

There was a beat of silence before Ubuyashiki laughed softly. "And here I was thinking that I'd have to convince you myself that we would benefit from you joining the Demon Slayer Corps," he said lightly and she laughed at that.

"To be honest, in the past I would have said 'no' flat out unless I'd be getting some sort of reward. I'm not a hero," she told him, "But someone taught me that I could be. Besides, I'm much stronger now, so I don't have any doubts…" She smiled a bit, shrugging. "If it means that I can continue to get stronger, I'll fight."

The blind man's smile never left his lips as he nodded. "Then I welcome you to the Demon Slayer Corps, Miyamoto Musashi," he said before he raised a hand. A crow flew down to his outstretched finger, perching there and tilting its head at her and Rengoku.

"Kasugaigarasu are crows that we use for communication," the man explained as another flew down towards Musashi, landing on her shoulder and lightly nuzzling her cheek. She stroked its feathers lightly as the man spoke again.

"Musashi, this is a very important question, but… do you know if any of your blades are considered to be nichirin blades?"

Musashi blinked. She had never heard that term before. "No. I've never heard of the term, and the only unnatural one would be Myoujingiri, right here," she said, drawing the blade and setting it down in front of her. Rengoku peered down at it.

"It looks like a normal sword to me…" he said and she nodded.

"I know that swords can have different colors and properties if forged right— all of my swords at least look normal. Myoujingiri is the only one with special properties," she told him, "Myoujingiri can cut through anything— And I mean anything. The Old Man told me that it can cleave through the supernatural, can cut through armor, boulders and even steel, but it is not something that a normal human can use. When I use it, it doesn't feel much lighter than a feather and it has a whole new level of divinity within it. He always said that is was imperfect since it can't really cut off anyone from fate or destiny but it can at least sever a cause… I suppose becoming a Demon is like a curse then…" She shook her head before she glanced up at the sky.

"I suppose stopped being a 'normal human' the first time I left my home dimension. When I reached Zero, I stepped onto the path of those who have surpassed humanity," she mused before she shrugged. "That's an entirely other topic for another day.

Ubuyashiki seemed thoughtful as the crow on Musashi's shoulder nuzzled her again. "I see… And you use that one to kill the Demons?"

"Mhm," she hummed, nodding, "I don't know if my normal blades would do anything for them, but I knew that Myoujingiri would."

The blind man nodded again. "I understand," he said, "Then I will see about having nichirin blades made for you," he assured, "For now, you may accompany Kyojuro to the Butterfly Estate, it would be best to get acquainted with your fellow Pillars."

Rengoku nodded a bit before he startled.

"Wait, Oyakata-sama, did you say fellow!?"

Musashi just laughed at his expression as the blind man smiled.

kjhgfkjghfsk I hope this one was written alright. Spell check gets finicky with stupid things.

Ubuyashiki will be referred to as Ubuyashiki when its Musashi's pov mostly, all the other pillars will have him as oyakata-sama. Basically, all characters are referred to their last names except for Tanjirou and Friends™ and The Rengoku family when it comes to Musashi. Since Tanjirou refers to a lot of the pillars with their given name (im not sure why) when its his pov they'll be referred to as such too. Basically names are based on whose pov it is. Speaking is different, obviously because everyone sorta has their own way they speak— ie: Kyojuro, I headcanon to be close to Uzui and (obvs) Kanroji, so he would use their given names when speaking. Changes in this (Musashi will eventually call others by their first names) will be because of relations changing (ie friends).

TL;DR: Last names used for the most part in narration, first names used in speech depending on relationships.