Why did Yoru change her goal?

Genuinely kinda confused because she's mimicking Makima, but instead of beating Gun being part of Makima's plan, Yoru's plan seems more for Denji and Asa.
I get Fami and Fumiko have other plans for their sister Death considering neither ever even attempt to bring a primal fear to fight Death.

But why does Yoru want her dead?
She doesn't want to change the world, she has no love for food or an unknown plot, she's not trying to stop the prophecy, she doesn't even like humans. She wants to toy/tease Denji and get Pochita as her weapon, sure. Yoru can't even have a plot or else Asa would know of it.
So why make him kill Death and stop the age of devils? It's either she did that because of Asa or for Denji, since he wants to see Nayuta and Power again in some form. And if he beats Death he can make it happen..