Kuroinu: Kedakaki Seijo wa Hakudaku ni Somaru

For over several centuries, a relentless and epic war has raged between two rival nations, consuming generations in endless conflict. Seeking to finally break the prolonged stalemate, one of the warring countries dispatches an elite special troop to turn the tide of battle. However, this decisive maneuver takes an unexpected and treacherous turn when the deployed soldiers completely abandon their allegiances, defecting to the opposing side. Turning their formidable strength against the very homeland they once served, these rogue warriors launch a devastating invasion into their former country. Amidst the chaos of their conquest, they boldly declare the foundation of an entirely new nation upon the conquered territory. Within the borders of this newly established state, a dark and oppressive law is enforced: every woman is compelled to sexually serve any male visitor who enters their domain, cementing a grim reality born from centuries of warfare and ultimate betrayal.