You were a loner in junior high and you expected it to be the same in U.A, but things were different this time. You met a few people who really cared for you, someone you even started falling for, but was it wrong? Were you in the way of his future?

After moving away from your old friends, you can't seem to find a new one. But one day in 7th grade you meet a certain Himiko Toga who seems to be your best friend. But later on after realizing the life and consequences you had taken to be friends with her, you questioned if you were really 'just friends'

She knew his thoughts and ways about finding the perfect life was wrong. She knew it the moment she was born into the world, born as a half-demon. The very thought of knowing his blood was flowing through her own body made her frustrated. She hated him. She was weak and useless in his eyes. Kibutsuji Muzan had wondered why did he allow this girl to be born in this world? Ah. He remembers, for he had fell in love with the girl's mother. Yet this girl was nothing like her mother. Her mother was obedient, and was willing to devote herself to him, yet she remained human. He couldn't be bothered that his so called daughter had decided to run away. Not like he could kill her right now, for she was not under his control. [name], wasn't given the privilege to obtain his last name. But she couldn't be bothered for she hated him to the every single cell that existed in his body. Running away was the best she could think of, until she bumped into Ubushiyaki Kagaya.

"As long as you are breathing, I'll come to you," Those words replayed in her head every day, and she could only hope for him to come save her. But as soon as tragedy falls upon his family, he abandoned her and his younger brother. She watched as he turned his back on her, yet something was tugging him back. It was more than just wishing she was alive. It was the fact that he was willing to sacrifice anything, just to ensure her safety. But little did he know, he was the one being saved.

"𝘏𝘦 𝘸𝘢𝘴 𝘭𝘪𝘬𝘦 𝘢 𝘭𝘪𝘨𝘩𝘵𝘦𝘳, 𝘪𝘨𝘯𝘪𝘵𝘪𝘯𝘨 𝘵𝘩𝘦 𝘧𝘭𝘢𝘮𝘦𝘴 𝘪𝘯𝘴𝘪𝘥𝘦 𝘮𝘺 𝘩𝘦𝘢𝘳𝘵" Women, they are such an unpredictable species of all. Well what's more when you don't even know her at all? Suprisingly, Kaguya the headmaster of demon corps personally chose a hashira who didn't even went to the hellish training and mission like the other Hashiras did. Well, its their lucky day. That Hashira came on that day! And on that moment his world stops, he couldn't even make a move nor utter a word. He just stared at the unknown person. Something is odd, or what could we say.. not right? -'something is odd about her.' Could you trust a person who just showed up? But love at first sight truly is blinding. Cover by: @-Pink_Bunny-

This started as a small idea. Just a bit of a "what if..." but since I love Kimetsu no Yaiba too much, it spiralled out of control and well... I have a lot planned, but I'll take it one at a time. So! This is a Reader x Rengoku au story. Of course, there's scenes with other characters and a whole plot I kinda have planned out but Rengoku is a bab so I'll try to focus mostly on him. The au affects him too so- Ahem! Anyways, it'll start a bit slow and I don't have a set update schedule so I hope you'll bear with me. Hope you enjoy the story! Disclaimer! Kimetsu no Yaiba and all it's characters belongs to Gotouge Koyoharu, the only thing I own is this plot and the Breath of Sparks. Warnings/Triggers : MANGA SPOILERS, violence, blood, death, language(mostly cuz Sanemi), angst, dismembered demon parts(?), idek what to put in this, crippling diabetes (I hope), and Rengoku's overwhelming fabulousness.

(Y/N), Sabito, and Giyuu were all trained by Urokodaki-sensei after their families were killed. Years later, guilt, regret, and doubt were words (Y/N) carried throughout her journey. What happens when she meets her last childhood friend once again? "I am forever yours (Y/N)," Giyuu whispered to my ears. Can a tragic past lead to an everlasting bond? The world is a cruel place with demons lurking in the shadows. The only way to fight back and prove one's bravery are the Demon Slayers. The Kimetsu no Yaiba. _______ Tomioka Giyuu X Female Reader (Please feel free to change the gender ❤️) Warning: Demon Slayer is an R rated anime and this fanfiction will follow in the same category. This story will be based on the manga and will contain spoilers.