The first title by NEKO WORKs’s sister brand, Chatte Noir.

A long time ago, an outsider 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.

That young man’s name is Yasaka Kuro.

He then meets Kiyoko, the eldest daughter of House Shiki. Two people who were born in to and lived completely lives, find themselves drawn to each other.

And on the day of their marriage- A nightmare is born.