Black Gates / Black Gate Kanin no Gakuen

Adaptation of the hentai game from Image Works studio...

The world is divided in two - into light and darkness. To prevent demons from the world of darkness from reaching the earth, guardian priestesses are chosen among the shrine maidens. However, even among the guardians there are those who desire power inaccessible to mortals. One of the twin sisters, Shizuku, is such a person. However, there is also the main character, the lover Narafumi, who maintains the balance between the sisters...