Tearing flesh, disintegrating ashes, cries of pain, battlecries from both groups and the exchange of names filled the once silent mountain of Uranohoshi. It was peaceful and full of life before demons started inhabiting the town. They started eating men,slaughtering kids and the powerful ones turns the teens and stronger ones into demons.

The once peaceful town was now filled with human-eating beasts. But some survivors there are blessed with some abilities and possesses the swords that can kill demons. Those people are called Demon Slayers. Demon Slayers works under the Demon Slaying corps. A corporation that doesn't belong to the government but it has been running since the oldest eras. It was founded after some people died because of paranormal activities,gruesome deaths and they tried to find the roots of it and they call it the 'King of demons'. The first and most powerful one,the one who runs a group of strong demons.

 "Ms.Kurosawa!"

 The owner of the name didn't have to turn to her side just to see the demon running towards her,just a glimpse of that specie was enough.. She tucked her body down,closed her eyes and held her sword firmly. As she does that,faint smoke escapes the corners of her bleeding lips and her body relaxed as she inhaled oxygen to her lungs. It didn't take that much time when blood circulated faster around her body and her grip tightens around the hilt of her Nichirin blade.

 "Breath of the Fire Dragon, Second scale!" She chanted as the demon gets closer.. "Death Claws!" She dashed towards the demon with fire circling around her sword and when she moved it to her side,the circle of flames turned into multiple gigantic claws that made the demon stop in halt. And in one swift movement of her hands.. The head fell down and the body disintegrated into ashes.

 The female was named 'Dia Kurosawa'. She's one of the strongest Demon Slayers and a part of the Hashira:the highest in the Demon Slaying corps ranking. She's known for her inherited breathing style called "Breath of the Fire Dragon" and for her elegant fighting style. Commonly,the Kurosawa family members wears the demon slaying corps uniform with a red yukata atop it. The yukata was accented with a Chinese dragon symbol while their swords have a chinese dragon-designed hilt.

 Dia suddenly felt a sudden chill in her spine and she turned her head around, searching something special to her and she successfully found it. Kanan Matsuura.. The woman was as busy as everyone,holding her double sword that looks like a pair of butcher's knife because of its shape,with weird holes and blades. Her pony-tailed hair was now down,she has a cut on her cheek ,her pants has multiple slashes,her shirt have a large torn in the middle and her blazer which is tied around her waist has holes already. She might not be one of the Hashiras but Dia knows that Kanan was capable of something that even her can't surpass. And Kanan has something that no one don't.. And that's why she loves her.

 Dia rushed in front of Kanan to block the incoming demon. "Kanan! You should find a safe place! You're wounded!" She shouted between groans and pushed the demon away from them.

"No!I-I must stay and help! There are still possible survivors out there!" She said and beheaded the incoming demon. She faced her back on Dia's and whispered. "My grandfather .. I think he's still out there.." She said softly while looking down at her swords and her bleeding hands. "Please.. Let me.."

 Dia just took a side-glance and she saw Kanan's low head, tight and shivering grip around her sword and her quivering lips. "Then ..I'll be coming with you." Dia nodded. The two beheaded multiple demons before fleeing away from the main battlefield,they encountered younger and weaker demons but they slashed their head off before they could lay a hand on them. They arrived to Kanan's ferry boat shop and the blue haired opened the door widely.

"Granpa!.."

Kanan called out and looked around. Their shop was dark with gas tanks fallen down and some tables flipped upside down. There are also water puddles on the ground and it assured Kanan. 'Someone was here' She thought and pulled out her swords.

 "Kanan,be careful." Dia whispered to her while she walks before her. Their steps are slow and careful because of the wooden floor and the two knows how loud it was if they take heavier steps. They've been here before. Kanan's shop was the couple's favorite place since their childhood because of the memories they made in here. This is where Dia first met Kanan when their family rent one of their boats. After that Dia often visits Kanan to play and Kanan's parents will warmly welcome her as their shop's loyal costumer. This is where Kanan confessed to Dia while they're watching the moon and the stars. And this is where the two had their first kiss. It feels sad that the place where the two had their most memorable firsts was now abandoned just because of demons. And what made it the worst was seeing Kanan's grandfather get eaten by a monster.

Out of pure anger,Kanan launched forward  without hesitation and cried outloud. She forms an 'x' with her sword and she was about to use her breathing form when something hits her side causing her to roll down to her side.

It was too fast that Dia didn't noticed it coming. She immediately made her way to Kanan's direction and inhaled sharply while holding her sword to her side tightly. "Breath of the fire dragon! Fourth Scale! Exploding wings!"

The demon that was hovering over the flailing Kanan turned its gaze to side only to be meet with Dia's deadly glare. He knows that it was too late for him to move away when Dia's sword stabbed down to his neck. "Die!" Dia growled at the demon and she pushed the sword deeper into it and when the edge of the sword gets out of its throat, wing like flames erupted from its inside. The demon's body exploded and turned into ashes.

"Well well.. Look what we have here.. A hashira." The demon who has been eating Kanan's grandfather finally spoke up. He licked up the remaining blood around his lips and stands up, making crackling sounds as he does. "Why are you here? I thought most of you are dying already?" Dia didn't said a word and just moved in front of Kanan to defend her lover. "Oh I see.. You know this old man here?" The horrifying demon cackled and took a step forward.

She stepped out of the darkness and too the moonlight. It reveals his slanted red amphibian eyes, long hanging tongue and small demons horns. Its skin color was pale green and its claws was long and covered with red liquid. It was wearing something they can compare to a samurai's armor which is sprayed with blood.

"Why don't you come and join my feast tonight? This old man doesn't have nutrients as much as young girls like you h---"

"Ocean breathing !First form! Clashing Tides!" Kanan jumped over Dia and towards the demon but the demon has moved to its side before Kanan's crossed swords meets his neck,but Kanan didn't stopped there. As soon as she landed on the ground with knees tucked down,she swung her right sword that cut off the demons legs. The demon also fights back by clawing Kanan's arm and biting a portion of skin. It tears a portion of Kanan's skin when he pulled his head away.

"Tasty as ev-!"

"Breath of the fire dragon! Second Scale! Death Claws!"

The demon didn't have the chance to see what Dia did because his head was already cut off after feeling a fast yet hot slice through his neck. He also feels his whole body getting crushed by an eagle's claw.

It was painful. But he deserves it.

Dia kneeled down beside Kanan who was hissing in pain. "Kanan!" She carefully pulled the blue-haired's arm to see the bleeding bruise. "It's bleeding badly." She took a bandage from her belt and wrapped it softly around her arm. Despite it being painful,Kanan didn't stopped Dia knowing the consequences if she let it be smelt in the open air.

As expected,more demons came after smelling Kanan's blood but more Demon Slayers came to help them as Dia protects Kanan.

As time passes by,the place slowly becomes quieter and quieter until the battlecries fade before the sun strikes. The Demon Slayer of course wins once again but they know this is not the last fight because they never encountered an upper moon that night.

____________________________

"Me and Kanan will quit as demon slayers."

Two days have passed since the accident and Kanan was quarantined in the Snow estate while Dia was sitting in front of the head of the Hashira. And it was smiling as usual. In front of her stood a gray-haired woman with blue eyes,despite being Majestic the eyes of their Master can't see anything around her that she have to ask her children about the scenery around her.

Behind Dia was the other Hashiras respectfully bowing down to their master.

"I respect your decisions." Was her words before she smiled at her.

"What!?" Someone's voice echoes from behind. Dia turned around to see the Ice Pillar's reaction.

The Ice Pillar was wearing slacks instead of the traditional uniform and instead of sandals and socks,she was wearing long black leather boots. She's also wearing a white long sleeved polo shirt instead of the usual black uniform. The Ice Pillar was named Sarah Kazuno ,and just like Dia ,she became a hashira in a short period of time because of her bloodline.

Sarah coughed and composed herself. "I mean... Isn't it unusual? A Hashira leaving the corporation for unknown reasons? I didn't even see you have any injuries from the previous fights. There should be no reasons for you to quit." She says and Dia sighs her frustration out.

"How well do you actually know me to tell my reasons?" Dia raised an eyebrow and Sarah turns her head away in shame.

"Whatever the reasons are. You have no reasons to know and being in the same class as mine is not a valid excuse.. Now if you may..." Dia calmly said before she sighed out the building frustration. She turned her head back to their Master and placed her and Kanan's sword down. Surrendering them is not the easiest decision but she has too.

"Wait!" Another person spoke from behind her.

The owner of the voice was the 'Storm Pillar' and Kanan's bestfriend. You Watanabe was wearing the sleeveless version of the uniform and the traditional pants. Hanging on her sides was her weird circular nichirin weapons. The youngest of them all.

"As a fellow Hashira,I'm concerned about the safety of the Fire Dragon Pillar and my childhood friend. So if I you will allow, Please let them carry their weapon until the last breath of their lives." You hastly bowed down and Dia turned back to their master,only to see her smiling softly.

"Why not? It's for their safety anyways." The older gray-haired said and Dia can't help but smile in glee.

"T-thank you. Very much!" The Master's daughter passed the weapons back to her and she held it tightly.

"But I have to tell you something.." The Master said and Dia looked up at her. "If you're planning to travel overseas,you must remember that demons might exist there. That's why I wan't you to send us letters every week as your assignment. And also... Care to study the demons there for the future of our corporation."

Dia smiled and nodded. "I will."

__________________________

The snow estate was cold as how the other demon slayers describes it.

Dia was sure that the season in the snow estate doesn't change just like how the real seasons were. It was always snowing there and sometimes,it was storming and no demon slayer can tell why.

Dia went inside,hugging her yukata tightly as if she was holding her dear life. It was so quiet inside that she can hear the wind howling beside her ears. She was glad that the insides of the estates aren't as cold as the surrounding outside and there's a working chimney in their main hall.

She sat in front of the chimney and extends her hands to heat up. She felt warmer when something hugged her from behind and enveloped her with a thick and soft blanket.

"How was your day?" She asks as she adjusted the arms around her neck. The person behind her shifted to sit and fence her with its own body.

"Sarah Kazuno is as brash as ever." The female behind her whispered before eliciting a giggle to her ear. Dia felt her hot breath tickling her ear causing her to giggle.

"The Ice Queen is so cold towards you. I wonder why." Dia turned her head up to kiss Kanan's cheek and the blue-haired sighed and rolled her eyes.

"Maybe she likes you that much and she doesn't want me in yours and her life. If it weren't Leah,the other's won't put effort to tend my injuries." Kanan continued and Dia sighs before looking back at the chimney.

"I think not. Our families are rivals for Eras after all so it's impossible. On top of that,I've seen her writing letters to someone and she doesn't want it to be seen." Dia protested and sunk further in Kanan's arms.

"Interesting." Kanan didn't have the time to continue when the subject of their chat went in while holding a tray of medicine.

"You're finally awake." Sarah's tone was low with a mix of irritation in it. Behind her was Leah Kazuno,wearing the demon slayer uniform but the pants was replaced with a skirt and long socks,holding a tray of scissors.

"Hi Sarah. Hi Leah." Dia greeted as she peeked her head out of the blanket.

Sarah didn't noticed her earlier so a tick mark appeared in the purple-haired's forehead and a smile plasters in her lips while Leah just hmph'ed and continued to the other patients' bed.

"Great timing Ms.Kurosawa. I want to talk to you about your friend's condition and I want it in private." Sarah said as she placed the tray on the table beside Kanan's bed. Despite knowing about Kanan's status in Dia's life, Sarah chooses to still call her 'her friend.'

Unwillingly, Dia stood up and braced herself from the cold and followed Sarah out of the room. The walk was quiet until they reached Sarah's office and the both of them sat down in opposite chairs. Surprisingly, there's a pair of mug of coffee which Sarah offers to Dia. Dia took a mug and let the smoke coming from it to warm up her face.

"So you're leaving by tomorrow already,huh?" Sarah asks in a much softer tone than earlier,Dia isn't surprised by that since Sarah is usually kind but not when someone mentions Kanan.

"How did you know?"

"Master announced after you left."

Dia sighs at that, she should've expected that. "Yeah. I was about to tell it to Kanan but y--"

"Why Kanan?"

"What?" Dia questions back and she saw Sarah's cold stare. Usually,other demon slayers will shiver in fear when they feel Sarah's dominance but not Dia.

Sarah stands up and rolled her eyes. "Why does it have to be Kanan? You have a younger sister,right? Ruby? Why not her? Isn't it too selfish of you to leave with that weakling?"

"How dare you!" It was Dia's turn to stand up. "You have no rights to say that and why do you care?" Dia's voice shakes at the end in anger. "If your reason has something to do with our background,I don't want to hear it." She slams the mug down,but when she did,Sarah held her wrists by a hand and pinned her against the table.

Before Dia could react,cold lips assaulted her soft ones and a hand gropes her right breast roughly. But before she could lose her sanity,she opened her arms forcefully and pushed Sarah away.

Sarah was catching for her breath while Dia was wiping her mouth with the hem of her sleeves. She shot Sarah a glare before walking out of the room. " You're disgusting."

Dia walked back to the main hall and was greeted by her lover. When Kanan saw her frown,she walked fast towards her and pulled her by the collar to engage a short yet passionate kiss. She needs Kanan's lips to take all those frustration out.

"We'll be going now while the sun is still up." Dia said after letting go of the kiss,leaving Kanan confused. "What?"

Dia ignored Kanan and walked towards Leah who felt the anger emitting out of Dia. "Kanan is to be discharge tomorrow ,Right?"

Leah only nodded and Dia nodded back. "Then it'll be fine if I take her now." There's something in Dia's voice that Leah can't figure but she is afraid of it. 'What have Sarah done again?'

Dia goes back to Kanan,pulled her wrist to the changing room and shoved her uniform in her hands. "Change,now." Clueless and somewhat afraid,Kanan obeys and closed the door to change. While Kanan was changing,Dia packs her things and pours Kanan's medicine in a bottle and when Kanan was done and changed, Dia pulled her out of the room and off the estate. A horse was waiting for them when they're out of the Snow Estate's territory and they rode it immediately with Dia as the manueverer since Kanan's wound might open when forced.

"Hey Dia.." Kanan asks as she clutches on Dia's waist. "This is just a wound y'know. We don't need to go overseas just to keep me safe." Dia sighs at this and pulled the reigns to stop for a bit. "Look." She tried her best to face Kanan. "I know how much you love to protect people and save lives but please let me.." She kisses Kanan's nose. " let me protect you this time. Let's escape even for just a short period of time. I promise that we'll come back in the right time and I'm sure they'll accept us as demon slayers again."

Kanan forced a smile and Dia smiles softly at her before snapping the reigns for them to continue. And in the middle of the ride, an owl landed on Dia's shoulder and a seagull landed atop Kanan's head.

"Warning! Warning!" The owl hooted beside Dia's ear,making the lass cover her ears. "Demons! Demons are on your way to stop you!"

"Wait.. I thought we're done as demon slayers...?" Kanan asked and the seagull above her head pecked her forehead. "Ouch!"

"I think it's fine. I think those are just the weak ones." Dia said and the owl's head spun in disagreement.

"Strong demons! They are decades old! Water Demons! Sea Demons! Boat demons! Hoot!Hoot!"

"No way.. "

_________________________________

Heya y'all! This is me SataniaLuciveros! You can call me Verochika or Sammy for short,whatever you like. This is a Kimetsu no Yaiba x Love Live Fanfiction.

As you noticed, the butterfly estate is replaced by the Snow estate which is residing at the top of mount Fuji! Don't tell any demons x) I'm just putting the location for the logical explanation why it is cold there.

Hope y'all like it despite of the explicit scene where Sarah almost raped Dia. Sorry about that xD Thank Yooooou