Memories of a Dead Star [Michikatsu (Kokushibo) x OC x Yoriichi]

Star 0: Memory of a Bloody Night

I hope you enjoy this story! Since we don't get much info of the time during Michikatsu and Yoriichi's training and becoming Demon Slayers.

I've got plenty of free range! ☆d(o⌒∇⌒o)b

I'm gonna have alot of fun! But since we don't know any of Sun Breath techniques so Yoriichi's fights are going to be quick and or make them up and change them later if we get anymore flashbacks or written records in canon.

Also I'm gonna try and keep the this in Kokushibo's point of view.
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"Tokito-Senpai!" shouted a female voice as I crossed blades with my descendent, I didn't take notice until I heard a familiar set of words...

"Third Constellation: Orion - Arrow of the Stars!"

I immediately separated myself from my opponent and blocked the strike with my flesh sword. My eyes widened to see a younger but familiar sight, a brunette girl with blue eyes and star hairclips that I knew all to well. She gave me a glare, however I had a feeling this girl was her descendent, we jumped away from each other and she helped up the boy. "Senpai, are you okay?" she asked as the boy got back into a fighting stance, "Ryūseigun? I thought you were with Kamado and the others!" he shouted to her, even her name was similar.

"They told me to go ahead, I sent my crow to get Genya-san for help," she argued. Tokito looked at her with frustration, "You need to go! This man is no ordinary demon!" She then smacked him upside the head, "I know that! There's no way I'm letting you fight alone! I know you're a pillar but even you need help!" That speech just solidified so I decided to speak, "You... Girl," I said catching the twos attention as they put their guard up. "What.. is your name? And how... do you know that Breathing?" I asked and she gave me a confused look, "Why do you care? I got no business giving that information to you!" She relented, "I do truly wish to know... I believe we are connected in a similar way as Muichiro and I are..."

"Wait, what do you mean?" asked the boy, "Yeah, we've never seen you before," the girl added and continued in, "All I know about is that your boss killed my mom!" I looked at the young girl, "I'm sorry for that... But what I mean... is that boy next to you is my descendent..." I revealed while pointing to Muichiro, then to her, "And you... are the descendent of one mine and my brother's of students..." 'she was my second love..."

"My human name... was 'Tsugikuni Michikatsu..."

My mind drifted to the time I met her officially...

My second love...

The woman I competed with my brother to court...

Hiro Hoshizora...

~~~~~~~400 or so years ago...~~~~~~~~

Yoriichi and I, along with some of our students had come upon an estate being over run by demons. We had to dispatch them quickly to save anyone who had not been killed and eaten, it took us till dawn. "I don't think any are left Brother," I said to him as I sheathed my blade, but he went further into the house and found something miraculous.

It was a girl, just a year younger than me and my twin. She was clutching the clothes of the lord to her chest, and a blood stained, broken katana next to her also injured form. I could see tears glistening onto the coat. Then I noticed the ashes and heard her whimpers, "Father... I'm so sorry... I'm sorry..." It then struck me like lightening, her father had become a demon and dawn must have struck him whilst she was defending herself. Yoriichi walked up to her and took off his haori, "Brother? What are you?" before I could question him further he put his haori around her, breaking her grief induced trance and she took notice of us. Her eyes were blue like the night sky, but like the day when the light hit them. Her chocolate brown hair, long and pooled behind her like a waterfall, her navy blue kimono depicting a flurry of stars.

"You are not at fault for what happened, your father would not want to mourn for him forever," Yoriichi spoke to her in his calm voice, "B-But..! Even when he told me to kill him before he changed... I.. I..." she sputtered out. My brother put her head to his chest and shushed her, "This only proves how kind your heart is, that is not something to feel guilty of," he continued. Her face changed from grief to agony, burying herself in Yoriichi's chest and clinging to him as she wailed in sorrow. He closed his eyes and held her gently, I made my way over to them and sat beside her as well. We stayed that way for only moment before she spoke again, "I will kill him...! That man caused all of this!" She said through her teeth, "I will never forgive him!"

I thought a moment then spoke, "Would you like to become a Demon Slayer?" I offered her, she looked at me with wide eyes, "My brother and I  can teach you our breathe styles and forge you a sword capable of hurting them." "You'd really teach me?" she asked us, my brother looked to me and nodded, "Of course!" I said taking one of her hands, "We promise," I declared and her sparkled not with tears of sadness or anger but with joy. I felt the heat creep to my cheeks, "Thank you..." she said before passing out and falling back into my brother's chest, "Ah!" I shouted with urgency and thinking she may have succumb to her wounds.

"It's alright, she only fainted from fatigue," my brother informed me and I sighed of relief. Yoriichi lifted her bridal style, "Let the students know we will be holding a funeral for the people who died to night, I'll dress the woman's wounds," I was shocked, my twin had never shown so much interest in someone except me... Is he going through puberty? He left to treat her in cleaner room or to find the estate medicine room.

If I had known just how much this would effect our future, I would have changed my ways far sooner...