Advisor to a Kindhearted Demon

The Demon King is dead, and the realms have been torn apart in his absence. A thousand years ago, the world's balance was thrown awry when Hell forcibly merged into existing lands, a realm called Hesperia becoming the new home of demons. Formed from the passing of corrupted souls, demons have long been at odds with the mortal races. For a time they remained at an uneasy peace, until a human hero struck down the Obsidian Throne's last ruler, and demons swept out in a vengeful fury to drown the mortal lands in blood. The hordes were pushed back eventually, but the demon realm remains fraught with bloodshed. Split into a dozen shifting states, warlords rise and constantly fall, locked in a power struggle for control of the land. This period of warring clans has lasted the past ten years, throughout which a scheming strategist has searched for the demon who can unify the land and end the fighting.  She may have found one at last, a newly formed and powerful demon, but a major obstacle lies in the way of her ambitions; this demon remembers another world where she was human, and she has no desire to fight or kill.  (A dark fantasy story with F/F romance and elements of progression fantasy, though for the deuteragonist rather than the POV character. Not an isekai, though at least one major character will have a similar background.)  Credit to proxybaba for the new cover! Format will be closer to traditional novel style than webnovel style, with longer chapters than the usual for RR. Now updating Sundays.