Definition of Insanity (KNY x GN!Reader)
- Reads 115
- Votes 8
- Parts 3
Ongoing34m
Last published Wed, Nov 5, 2025
(KNY x Gender Neutral Y/N)
Being reincarnated into Demon Slayer is a dream come true for any mentally ill teenager in the 20th century, but is it really so ideal if you get reincarnated as a demon AND 100 years before the main story starts? You find out pretty quickly that no, it definitely isn't the ideal experience.
[DO NOT FEED MY WRITING TO AI]
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#813
uppermoons
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Akaza x F!Reader x Rengoku
A year ago, a chance encounter changed everything. A man-stranger, mysterious, and striking-ran into you as you walked down the street. You never expected to see him again. But fate had other plans. A year later, you meet him once more... only he's not the same. He's a demon now, and yet, somehow, your connection feels even stronger. Over the past year, the two of you have become unlikely friends, learning each other's secrets, quirks, and scars. Just when your life starts to feel predictable again, a new neighbor moves in. Charming, sweet, and impossible to ignore, they quickly become someone you can't help but grow close to. Now, two people-one demon, one human-are falling for you at the same time. You find yourself caught in a tangled web of feelings, confusion, and desire. But before you can figure it all out, a terrible accident changes everything. When you wake up, you realize you're not supposed to be where you are... and nothing will ever be the same. Set in a modern world where demons exist but don't fight humans-Muzan transforms humans into demons for reasons only he knows-this story explores friendship, love, heartbreak, and the fine line between danger and desire. Warnings: Fluff, Sexual Content, Violence/Gore, Strong Language. Note: Smut may appear in future chapters, but for now, this story focuses on emotional tension and dramatic romance. Contains spoilers for the Demon Slayer manga. MODERN AU
Shadows of the Taisho | Demon Slayers
This is my third Book of Demon Slayer: Kindly read my first (The Untold Past of Kibutsuji Muzan) and second book (Whisper of Sun) books for no information that would be left behind when you read this book!!🥰❤️ Centuries have passed since the Sengoku Era, and the world has shifted, ushering in the vibrant, yet rapidly modernizing, Taisho Period. For Kibutsuji Muzan and Akari Yuki, time is a relentless current, carrying with it the enduring ache of a profound loss: the quiet departure of their beloved son, Yoriichi. His memory, a bittersweet anchor, fuels their resolve as they navigate an era poised on the brink of its own unique darkness. Though they dwell in a hidden sanctuary, shielded by Muzan's formidable illusions, the insidious influence of the progenitor-Muzan's own malevolent splinter-begins to spread like a creeping blight across Japan. Demons, more numerous and terrifying than ever, now stalk the night, threatening the fragile peace of human lives. As the true Demon King prepares for his ultimate confrontation, Muzan and Yuki must step further into the shadows, their ancient powers and hard-won wisdom now critical. From their hidden vantage point, they will guide, protect, and prepare for the cataclysmic battle that looms, a battle that will determine the very future of humanity and demonkind. "Shadows of the Taisho" is a journey through an era of burgeoning hope and creeping dread, where love defies destiny, sacrifice shapes the future, and an extraordinary family fights an unseen war for the soul of the world. Brace yourself for a tale woven with profound emotion, fierce loyalty, and the ultimate clash of wills. ⚠️ a lot of swearing/cursing ⚠️ VIOLENCE AND BLOOD ⚠️ MIGHT HAVE manga SPOILER!!! - I don't own the characters Kimetsu no Yaiba (Demon Slayer) and it belongs to Koyoharu Gotouge. - Pictures also do not belong to me and I get them from Pinterest. - English is not my first language so it's might be some grammar errors
Whisper of Sun || Demon Slayer
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Something That I Wish For - [Kyojuro Rengoku x OC/Reader]
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さようなら; 𝑲𝑵𝒀! 𝑼𝑷𝑷𝑬𝑹𝑴𝑶𝑶𝑵𝑺 [✓]
━ ❝ 𝐈𝐅 𝐈 𝐊𝐍𝐄𝐖 𝐈𝐓 𝐀𝐋𝐋 𝐓𝐇𝐄𝐍, 𝐖𝐎𝐔𝐋𝐃 𝐈 𝐃𝐎 𝐈𝐓 𝐀𝐆𝐀𝐈𝐍? 𝐖𝐎𝐔𝐋𝐃 𝐈 𝐃𝐎 𝐈𝐓 𝐀𝐆𝐀𝐈𝐍? ❞ ᝰ in which a girl befriends a demon and complicates her relationships with the demon slayer corps .ᐟ ( kny upper moons x fem!reader ) ! manga spoilers ! kimetsu no yaiba belongs to koyoharu gotouge plot belongs to @/-zenxtsu s t a t u s : completed !Complete
𝐓𝐇𝐄 𝐓𝐄𝐍𝐓𝐇 • 𝘒𝘪𝘮𝘦𝘵𝘴𝘶 𝘯𝘰 𝘠𝘢𝘪𝘣𝘢
𓉘 VARIOUS!KNY x Fem!Hashira!Reader 𓉝 ִ𝐃𝐄𝐒𝐂𝐑𝐈𝐏𝐓𝐈𝐎𝐍 ࣪𖤐ᝰ.ᐟ - The hashira was always missing, no one has seen her at all. just what was she, and what was she doing ? How irritating ... she was so detached from the real world. So much so that the Hashira had ties Kibutsuji Muzan. 𝐖𝐀𝐑𝐍𝐈𝐍𝐆𝐒 > Bad Language > Gore > Mature Themes 𝐏𝐔𝐁𝐋𝐈𝐒𝐇𝐄𝐃 15/8/25 !! I do not own demon slayer or the original plot from the anime at all, all credits are reserved and belong to Koyoharu Gotouge. I only own the character L/N Y/N and some changes and ideas to the main storyline.
𝗦𝗛𝗔𝗗𝗘 ❘ 𝗞𝗡𝗬 𝗙𝗔𝗡𝗙𝗜𝗖
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Demon Slayer: A New Enemy
What if Muzan wasn't defeated and instead pulled a trump card in order to save his own skin? A new king destined to bring terror once more. What if some of the uppermoons were cured thanks to Tamayo's cure efforts? A new ally arises to help the fellow slayers to defeat a new enemy. Note: To those who don't know Demon Slayer, watch the anime and/or read the manga. Because it wouldn't make sense for the new readers. I do not own the Demon Slayer characters nor the story. I used it as a reference to maintain the continuity of the story with a few changes in this AU fanfic. Also I own my original characters here, and there will be spoilers up ahead. Click at your own risk and enjoy it.Complete
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A year ago, a chance encounter changed everything. A man-stranger, mysterious, and striking-ran into you as you walked down the street. You never expected to see him again. But fate had other plans. A year later, you meet him once more... only he's not the same. He's a demon now, and yet, somehow, your connection feels even stronger. Over the past year, the two of you have become unlikely friends, learning each other's secrets, quirks, and scars. Just when your life starts to feel predictable again, a new neighbor moves in. Charming, sweet, and impossible to ignore, they quickly become someone you can't help but grow close to. Now, two people-one demon, one human-are falling for you at the same time. You find yourself caught in a tangled web of feelings, confusion, and desire. But before you can figure it all out, a terrible accident changes everything. When you wake up, you realize you're not supposed to be where you are... and nothing will ever be the same. Set in a modern world where demons exist but don't fight humans-Muzan transforms humans into demons for reasons only he knows-this story explores friendship, love, heartbreak, and the fine line between danger and desire. Warnings: Fluff, Sexual Content, Violence/Gore, Strong Language. Note: Smut may appear in future chapters, but for now, this story focuses on emotional tension and dramatic romance. Contains spoilers for the Demon Slayer manga. MODERN AU
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