"Kuroinu: Kedakaki Seijo wa Hakudaku ni Somaru" is set in a medieval fantasy world where the continent of Eostia is divided into seven nations, each protected by a shrine maiden known as a "Shrine Maiden of Virtue." These maidens are revered for their purity and divine powers, which maintain peace and balance across the land. The story begins with the Black Dogs, a mercenary group led by Vault, who are hired by the Eostian Alliance to defend against the invading forces of the Dark Elf Empire. However, the Black Dogs harbor a hidden agenda, seeking to overthrow the existing order and establish their own dominion. The narrative unfolds as the Black Dogs betray the Eostian Alliance, capturing the Shrine Maidens and subjecting them to systematic humiliation and degradation. Each maiden represents a different nation and embodies unique traits, such as Claudia, the stoic and noble leader of the Eostian Knights, and Celestine, the compassionate and devout High Priestess. The mercenaries exploit the maidens' vulnerabilities, using their capture as a means to destabilize the nations and assert control over Eostia. The plot delves into the psychological and physical torment inflicted upon the maidens, as well as the broader political and social upheaval caused by the Black Dogs' actions. As the story progresses, the Black Dogs' influence spreads, and the once-unified nations of Eostia descend into chaos. The maidens, stripped of their divine protection and dignity, struggle to resist their captors while grappling with their own shattered faith and identities. The narrative explores themes of power, corruption, and the fragility of societal structures, as the Black Dogs' reign of terror exposes the darker aspects of human nature and the consequences of unchecked ambition. The series concludes with the Black Dogs achieving their goal of domination, leaving the fate of Eostia and its people in a state of uncertainty and despair.