The world has been annihilated and an evil bestial deity must be appeased. Saki, a young girl, trying to escape destiny, finds refuge in an unusual and rough line of work. But she has been chosen for an unthinkable role; a princess must be sacrificed to the monster Yamata-no-Orochi at the 50 year Tenken Festival. Can Manaka, the man who is in love with her, follow her into this abyss to save her from fate? Or will he accidentally uncover the dark secret of the ceremony?