Inda no Onihime Annerose

Gridania is a small kingdom renowned for its two national treasures: Queen Hildegard of unparalleled beauty and mercy; and the lovely Princess Anne-Rose, a genius warrior whose mastery of the sword makes the greatest experts green with envy.

But every kingdom, even the best of them, has dark subjects ready to do anything for their own interest. To achieve his ends, the Minister of Finance Hingen uses the pretext of a treaty of alliance with a neighboring country in order to send the queen and her daughter there. The trap closes on the two women who then become sexual slaves...

(Source: Manga Sanctuary, translated)