The Slave-Reversing Rebel Demon King: How a Devil of the Weakest Race Builds a Forbidden Harem

100 years ago, the war between humans and demons ended with a victory for humanity. Defeated, the demons' numbers dwindled, and survivors were overwhelmed by the humans under the protection of the Goddess. Since then, demons have been destined to become human slaves at birth, and it's become commonplace for them to spend their entire lives serving humans.