Demon Slayer: Starting with Tanjuro Kamado

With memories of the future and the System that lets him trade his life force to kill demons, Tanjuro Kamado decides to save his family and destroy Muzan. Step one: kill demons! Step two: kill more demons! Step three: still more demon slaying! When Muzan comes calling, he finds a man sitting calmly at the entrance, waiting for him. Tanjuro Kamado: “You’re Muzan, aren’t you? I’ve been waiting for you. Ready to die?”