Demon Slayer: For My Sister and Everyone Else, I’ll Cut Down Muzan

[Transmigration, sisters, happy ending, no definite romantic pairing for the protagonist, apologies for any out-of-character moments]

Everyone knows that a big truck is a summoning device for another world, and I was the lucky one.

After an accident, I transmigrated into the world of Demon Slayer, though I didn't find out until more than twenty years later.

When I finally learned the truth, I never expected to run into Muzan that very night. My little sister and I both turned into demons. Well, this is just great, Muzan! You hurt me both online and in real life! Just you wait!

I'm going to bring disaster down on you.

Muzan: What is that black tube you have?

Xinyue: Genya, don't bother with him. Blast the bastard!

Muzan: What do you mean, I can still witness a Breathing Style that was lost hundreds of years ago?

Tanjiro: Sun Breathing!

Nezuko: Moon Breathing!

Me: That's right! Let's cut Muzan down without mercy! Hahaha!