All demons are grey in the dark

"All cats are grey in the dark."

This is a proverb. It means that in the dark, you can't tell one cat from another. In a figurative sense, it could also mean that someone who has too little information can't properly assess the situation. They can't distinguish between good and evil.

When the Demon King died, the black line separating good and evil was broken. Demons find themselves, demons seek themselves. Demons are evil, demons are good. Demons remain lonely, demons find the family they didn't know they were searching. But how can you tell them apart if you can't see in the darkness? How can you judge whether you're doing the right thing when all you can see is grey? And in the deepest darkness of ignorance, confusion, the darkness of a decline of selfishness and ignorance, only the cats seem to see through the darkness.

This story is a tragedy, just like Demon Slayer. There is an ending. Is it a good one? A bad one? Is the dried cat blood on the ground worth it? Was it all worth it, were the dead, the lost, worth it, just so someone switches the light button on? Was it all worth it when you look around and realize that cat blood is just as crimson as a human's?

...Basically: "What if the hashira didn't fall into the infinity castle?"

Disclaimers:
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! Manga spoilers !

! I do not own Demon Slayer, it belongs to Koyoharu Gotouge !

! English is not my first language, but I'm learning, so please say if there are any mistakes. !

! Descriptions of Demons and Slayers doing bloody things (imagine descriptions of things that happen in manga and anime just as a book) !

! OCs !

! I really try to keep characters and relationships accurate !

! Worldchanging Headcanons !

! Extreme Angst !

! Major character death !