My Words in Demon Slayer Have Come True

:) This is a Demon Slayer fanfic, with a single female protagonist, Butterfly Ninja, and the protagonist Goldfinger prefers assisted breathing techniques, and will try his best to make up for the regrets he can (: As soon as Seigen Shin opened his eyes, he found that he was in the world of Demon Slayer. But he was disappointed to find that there was no bonus system! There is only a wordless book floating quietly in my mind. The bookish energy was quietly produced, opening the door to change. Honesty: I said don't die! Are you deaf? Everyone: Am I not dead? Honesty: I say evil spirits will be killed! Wuxian: Danger! Chengyanxin: I said... You put... Wuhan: Stop talking, brother, I regard life as a treasure! (;´༎ຶД༎ຶ`) The introduction is weak, so move on to the main text.