She Came from Oeyama [Demon Slayer Crossover]

The fake oni: Pallid skin, the face of someone close to death, forced to eat people to regain their sanity, unable to be exposed to sunlight and doomed to scrape by in the dark. They die if a specially made blade cuts off their heads.

The real oni: Born at Rashomon, raised on Mount Oe, rubbing shoulders with the oni king and drinking with the oni generals. They often wander around the lodge of some bald onmyoji to kill time. Even a casual skill is enough to make the little yokai fall to their knees in admiration, and the next second they can transform into an ultimate life-form.

Muzan: ...So what are you trying to say?

Kuchisemi: I'm saying that in the next second, I can beat you until you call me Dad.

Scene One:

Shuten: She keeps pestering me all day to call her my best friend.

Kikiri: She keeps pestering me all day to call her Dad.

Shuten: ...

Kikiri (aggrieved): I was the one who found her and took her in. She should be calling me Dad.

Shuten: ...Is that the point?

Scene Two:

Kuchisemi: Minamoto no Raikou, I swear on your mother's legs, what the hell did you do to my little brat? Look at him now. He's even dumber than before!

Kikiri: ...Who's the little brat you're talking about?

Minamoto no Raikou, internally: How the hell should I know?

Scene Three:

Muzan: Who are you, anyway?

Kuchisemi: I'm the thief who steals your mom's coffin money on a dark and windy night.

Scene Four:

Muzan: What a pitifully weak bunch of creatures...

Ibaraki: (extends an oni claw)

Shuten: (pulls out a sake gourd)

Kikiri: (draws her blade with a whoosh)

Kuchisemi: Charge! Sisters! Let's send him off with a smile, us four beauties of Mount Oe!

The sisters: ...

#The heroine is an oni from somewhere around Mount Oe, with the looks of a cute girl and the personality of a burly man.

#She was raised by the rough-and-tumble oni men of Mount Oe.

#Her vitality was so strong she survived being raised by them.

#A silly comedy.

Theme: Do not fear the darkness. Stay true to your heart and to what is right