Demon Slayer: Becoming Muzan Kibutsuji from the Start

A retired leader is reborn as Muzan Kibutsuji, the Demon King, and from the start, Yoriichi has a blade at his throat.

I ask him, "If you kill me, who's going to manage the five hundred demons?"

Later, the Demon Slayer Corps supplies me with blood, the Upper Moons work for me, and Ubuyashiki signs a wager contract with me.

Forget "Muzan Kibutsuji." Call me Secretary Wang.