Riho, who grew up all alone, was adopted by the Hanabishi family and spent harsh days being oppressed by everyone around her. And on her seventeenth birthday, Riho is told by her adoptive father to become the ayakashi's "sacrifice." However, the ayakashi emperor who appeared in front of Riho, who was in despair, intended to welcome her as a "bride" instead of a "sacrifice" -?!