For a thousand years, the Demon King Muzan Kibutsuji ruled from the shadows. But what if he wasn't the only one? Born from the same tragedy, Y/N is Muzan's older brother and the first demon beside him. Known throughout demonkind as Upper Moon Zero, he is a being so ancient and powerful that even the Upper Moons fear his name. Unlike Muzan, however, Y/N is eccentric, curious, and impossible to understand. When a boy named Tanjiro Kamado enters the world of demons and Demon Slayers, Y/N finds himself strangely interested. What begins as simple observation may become something that changes fate itself. The story of the forgotten brother begins. I do not own demon slayer.

In which you find yourself in Demon Slayer after staying up too late one night and forgot to keep your sanity. "... Why am I here? Just to suffer?" "Y/n, I'm hungry." "... Crap." ... Demon Slayer, its story, and characters do not belong to me, they all belong to Koyoharu Gotogue. I only own this fanfic's plot.

Isekai!Fem!Reader x Various!KNY Modern!Reader x KNY Time and space warped around each other, molding the perfect gateway for you to travel to a world you deemed fictional. You were set on this earth with an objective you were unaware of, but you shared similar goals. - Find a way back home - Save all those doomed to die - Gain a harem The last one was more of a joke, and you thought that all of this would be pretty straightforward. You train a ton, warn the hashira, then find a way back home. But it wasn't. After all, complicated situations bring complicated results. - "...I thought you were my wife" "You're the third person to say that!!"

You weren't supposed to survive. When you wake up inside the world of an otome game based on Demon Slayer, you quickly realize something is wrong. The system is gone. There are no dialogue choices. No affection meters. No reset button. And the love interests? They remember you. Every route you played. Every bad ending you triggered. Every time you chose someone else. Now the Hashira, the Kamado siblings, the demons-even the Demon King himself-aren't following a script. They're watching you. And this time, they refuse to lose. In a world where demons devour humans and obsession runs deeper than blood, you must survive twenty men and women who believe fate tied you to them. The red thread isn't romantic. It's a leash.

When a girl wakes up inside her favorite manga, Kimetsu no Yaiba, after throwing herself in front of a truck to save her best friend, she arrives with nothing but her memories, and the sinking realization that to save everyone, she must become stronger than she ever imagined. Thrown into a world she once knew only through pages and screens, Y/N is forced to confront a terrifying question: If everything around her is fiction... why does it feel so real? She thought she knew this story. But stories change when you step inside them. She hides the truth of what she knows. She hides the truth of what she is. And she hides the whispering fear tightening around her heart: If this world is a story... does she truly belong in it? But the demons grow stronger. Her strange instincts sharpen. And the line between fiction and reality begins to blur. She feels their hands, their warmth, their grief, emotions too vivid to be "made up." She begins to wonder: Are they really fiction at all? Caught between the weight of a previous life and the bonds she's forming now, Y/N must decide what she's willing to become, and what she's willing to sacrifice, to protect the ̶p̶e̶o̶p̶l̶e̶ c̴̄͑͛̃̿͆̇̃h̶͗͒̒̂̇ả̷̌͛͑͆́͌̃̾̕̕͝͝r̸̛̦͍̪͇̫͔̩̻̭͓̣̿̽̽͒͂̋̑͆̓̓̈̀̈̕̚a̷̛̼̓͗́͑̆͆͋͌̔̂c̸̰̫̺͔̩̦̱̠̑̚͝t̶̤̬̜̜̭̤̱͎̩̣͙̺͕͎͛̎͊̈́̋͊̾e̸͛̄̾̈r̶͆͗̑̀͗͌͂̔s̶̡̰͎̝̭̙͓̬̟̾̄̓̾̏̽̉̈́̓̉̑̆͊̏ who believe in her. A story of second chances, hidden truths, and a girl determined to rewrite the fate laid before her. Caught between the fate she remembers and the fate she refuses to follow, Y/N carves her own path, reshaping destinies, forging impossible bonds, and discovering that sometimes the line between reality and fiction isn't a line at all. It's a blade. - Start: 26 Oct 2025 End: - Characters are from Demon Slayer except Y/n and any ocs. Rankings 1# Muzan 1# Obanai 1# yaiba 1# femreader 2# Mic

Since spawning into your favorite anime Demon Slayer, you have a very clear agenda. 1.) Save your favorite characters 2.) Come up with a kickass breathing style 3.) Create your own harem AS much as you thought your third idea would just be a funny joke, you soon realize that maybe it wasn't as far fetched as you thought. This is also published on Quotev

❝ My last words were 'yeet'. What a disgrace. ❞ - (Y/N) (L/N) while dying (again) on a riverbank. ~~~ After dying in a freak accident, you found yourself half-dead in a snowy forest. Pretty much accepting your fate, you passed out. When you woke up, you were in a small house that was most definitely of Japanese origin. 'I've been kidnapped.' was what you thought. 'I've been kidnapped by people who like Japanese interior design.' Join (Y/N) on your quest to save your favorite characters from certain death all while struggling to keep your dumbassery under control. ~~~ [Kimetsu no Yaiba/Demon Slayer x Isekai!Fem!Reader] ~~~ Highest Ranking: #1 in isekai #1 in kny #1 in kanaoxreader #1 in mangaxreader #1 in demonslayerfanfiction #1 in genyaxreader #1 in inosukexreader #1 in muichiroxreader #1 in kamabokosquad #2 in crackfic #2 in isekaireader #2 in tanjiroxreader #3 in manga #4 in animefanfiction #5 in readerinsert #6 in kimetsunoyaiba #8 in demonslayer #28 in anime #51 in fanfiction #51 in fanfic

━ ❝ I'm so screwed. ❞ 𝐈𝐍 𝐖𝐇𝐈𝐂𝐇 a girl from the 21st century finds herself stranded in the world of Kimetsu no Yaiba. Survival becomes more than fiction. Wrong era, wrong world, and bloodthirsty demons are real. From the moment she meets Tanjiro Kamado, her fate intertwines with his, and she embarks on a perilous journey alongside him. Can she survive the terrifying reality of her favourite anime without completely losing it? ❦ 𝗔 𝘀𝗹𝗼𝘄 𝗯𝘂𝗿𝗻 𝘀𝘁𝗼𝗿𝘆 𝗮𝗯𝗼𝘂𝘁 𝗰𝗼𝗻𝗻𝗲𝗰𝘁𝗶𝗼𝗻, 𝗴𝗿𝗼𝘄𝘁𝗵, 𝗮𝗻𝗱 𝘄𝗵𝗮𝘁 𝗶𝘁 𝗺𝗲𝗮𝗻𝘀 𝘁𝗼 𝗯𝗲 𝗵𝘂𝗺𝗮𝗻. 「 KNY x ISEKAI!FEM!READER 」

「 You led an ordinary life as a typical girl, deeply engrossed in the world of anime and manga, with a profound love for martial arts. Sadly, your parents had died, leaving you to navigate the world on your own and blending into the fabric of everyday existence. Unexpectedly, an inexplicable event transported you into the mesmerizing world of your favorite anime-Demon Slayer, where to your astonishment, you found yourself face-to-face with none other than Kamado Tanjiro. 」 The unfolding events? Well, that's a story waiting to be unraveled. 「 Highest rankings 」 | #1 kimetsunoyaiba | #1 demonslayer | #1 romancefanfiction | #1 harem | #1 femalereader | #1 isekaireader | #2 isekai | #1 kimetsunoyaibaxreader | #1 demonslayerxreader | #1 knyxreader | #1 variousxreader | #1 readerxvarious | #1 tanjiro | #1 nezuko | #1 inosuke | #1 mitsuri | #1 shinobu

"I can rearrange your organs for you, mister!" "...That sounded like a threat." In which an unhinged little demon uses her Blood Demon Art to heal people! Will things turn out differently with her there? #1 in kny #1 in demonslayer #1 in kimetsunoyaiba