I want to destroy humanity or something like that.

"Ugh, I want to slaughter all the humans—" "Young lady, you've been saying that for years now, but when exactly are you going to do it?" "Well, sometime this year, I suppose—" The demon clan, having been defeated by the human "hero" and their Demon King destroyed, now found themselves completely under human rule. Among them, the Demon King's daughter, "Mako," had gone missing. However, she was not dead, and was supposed to be biding her time, waiting for an opportunity to destroy humanity... or so it was supposed to be.