Nie no Hakoniwa: Dollhouse of Offerings

A long time ago, an outlander appeared before the village of a long-suffering minority. In his possession was a mysterious "box" which was used by the oppressed to rise up and overthrow their oppressors. Years later, that oppressed group formed seven noble houses and grew prosperous. However, House Shiki, which stood first among the Seven Noble Houses did not have a son to succeed the family. In order to have an heir, a young man from outside the village was adopted in to the family. Kurou, born and raised as a "product" and ignorant of the subtleties of being a "person," is introduced to Shiki Kyouko, eldest daughter of House Shiki. These interactions begin build emotions within him. And on the day of their marriage - A nightmare is born.