Muzan happy ending
It's been over a hundred years since Muzan kibutsuji absorb tanjiro and went on wiping out the demon Slayer Corp once and for all and getting rid of all the other demons so none of them could try and take his power.
Now these days he spends his time at the beach relaxing in a summer outfit.
He's also wearing his hat
Muzan take a drink of his favorite red juice and said, "This Is The Life."
The end
Lol
Okay this was just a little bit bonus what happened after.
Anyway I hope you all did enjoy this.