JK to Orc Heidan: Aku Buta Oni ni Ryougyaku Sareta Seijo Gakuen

Based on the erotic game by Blue Gale Light.

Deep in a forest, there existed an old European-style building made of brick. It was an all-girls' school attended only by girls from good families.

One day the school was covered by a mysterious thick fog caused by an earthquake. Orc soldiers emerged from the ominous fog.
...