Demon Slayer: The Demon King Is a Fragile Girl?!

(Original title:) Stay up the latest, read the weirdest books! Transmigrated into her own fanfiction as the villain Muzan, and keeps failing to get back home? Reborn, she declares: From today on, I'm no longer the old Muzan—call me Niu Hulu Muzan! She imagined countless ways slacking off could change the plot, but never expected things to get this absurd... Original Muzan: So you're the woman who stole my body? Tanjiro: Wow, she's so kind, pure, and unique! Giyu: Little Muzan, I met you first... Sanemi: You know full well—