Demon Slayer: What Do I Do After Transmigrating into Muzan Kibutsuji?

Hi, I'm xxx, and I'm freaking out right now because I woke up as Muzan Kibutsuji. As the saying goes, every piece of bad news comes with some good news. The good news is that I only became a "demon" recently. The bad news is that the doctor has already been eaten. I mean, I woke up and saw bloody entrails on my hands... Sanity rapidly decreasing... I'm sorry. When I die, I'll go to hell and atone for this! But just as I was still panicking, a demon followed the smell of blood and barged in... A demon... barged in... Me: ...??? Didn't I just become the Demon King?! : Everyone becomes Muzan Kibutsuji. : Lots of first-person narration! (Actually, almost all of it is in first person.) : Please treat the world of this story as a parallel universe! This Muzan is a newly turned Demon King who loves making snarky comments and is kind and beautiful at heart (?). : Most of the story is based on my own ideas, and much of the plot may be original. Basically, anyone who dies will become a demon, so this is a very happy ending. Consider this your advance warning. : If the timeline doesn't line up, it's my own version. Keeping track of the timeline is so hard, sob. : Updates whenever inspiration strikes. Theme: You must always be kind...