Demon Slayer: The Demon King is actually a weak girl?!

(Original title:) Stay up the hardest all night, read the most speechless book! She traveled into the fan fiction she read and became the villain Muzan. She wanted to go back but failed again and again? After rebirth, she said: From today on, I am no longer the previous Muzan. Please call me - Niuhulu Muzan! She thought about the countless possibilities that would happen after she changed the plot, but she never expected that the development of things has become more and more outrageous... The original owner Muzan: Is it you, the woman who invaded my body? Tanjiro: Wow, she is so kind, innocent and special! Tomioka Giyu: Xiao Wu, it was obviously me who met you first... Fuzui Miya: You knew...