In Demon Slayer: From the Start, I Fused with Muzan Kibutsuji!

After transmigrating into Demon Slayer, he fused with the despicable boss from the start: Muzan Kibutsuji!

He also gained the demon ruler's evolved five brains and seven hearts, along with absolute control over all the demons in the world!

Standing in the Infinity Castle, Yue Yan wore a cold smile!

With Yue Yan's arrival, Japan's Taisho era entered a whole new age!

This novel and its characters are entirely fictional. Any resemblance to real people or events is purely coincidental. Do not imitate.