Reincarnated as Muzan: From the Start, Hakuji’s Demon Transformation Goes Horribly Wrong

[Two Male Leads] [Demon Slayer Fanfic] [1v1] [Breaks Up Original Canon Couples] [Akaza/Hakuji x Non-Original Muzan]

A diehard Upper Rank Three fan got incredibly lucky on his way out of the cinema, then promptly kicked the bucket.

When he opened his eyes again, he had become the greatest menace in Demon Slayer: Muzan Kibutsuji!

“Go ahead. I promised you.”

He could recognize the boy in front of him even if he were reduced to ash. Wait, where the hell am I? Is this the scene where Hakuji becomes a demon from the start?!!

But something seems off...

Keizo and the others are still alive? The poison isn't fatal? Then why did Big Bro Three die?!

Koyuki is alive too? That's great!

It seems that apart from becoming a demon, Hakuji's fate is taking a turn for the better. But something still feels off...

The moment Muzan sees Koyuki, he stares at the sturdy, energetic-looking, burly woman holding Hakuji in her arms... Is this right? Shouldn't Koyuki be a delicate, frail young woman, gentle as a traditional Japanese maiden? Who is this powerhouse? And put that Nichirin Blade away! Who taught you Sun Breathing?! (Screams like a groundhog.)

Later, Muzan only wants to make his favorite character happy, but somehow ends up getting tangled up in it himself. When he finally realizes what's going on, he bolts upright in bed. He seems to have, maybe, somehow, ended up in the wrong world!