Born as one of a pair of twin shrine maidens into a family with purification powers for generations, Yuzuki Kugu was considered unlucky because of the dragon-shaped markings on her back. Although she has far greater abilities than her younger sister, Mizuki, she is persecuted and her existence is hidden.

Tired of being forced to use her powers solely as a tool for Mizuki, who has the support of the villagers as princess-miko, Yuzuki yearns for freedom and possess a faint longing for the owner of the mysterious voice she hears from time to time since long ago. As if in response to her despair upon discovering that this wish will never be fulfilled, a cursed god in the form of a dragon appears in the village, covering the skies.

The dragon-god Sougyoku appears before Yuzuki in human form and embraces her. While she is forcibly offered as a sacrifice, she has a flashback of memories of her previous life. She embraces him and he says, "I will never let you go again, my only bride."

The true princess-miko, sacrificed in place of her sister. Desperation awakens the promise and miracle of a previous life made by the dragon god and his bride.