After a strange dream of a mysterious ancestor, high school student Yuuko Yoshida wakes to see that she has grown demonic horns and a tail. Dazed and confused, her mother reveals to her a dark family secret: her family is descended from a Dark Clan that was banished to live powerless and destitute by their mortal enemies, the magical girls of the Light Clan. The only way to lift their ancestry's curse is for Yuuko to find a magical girl, murder her, and splatter her blood all over her ancestor's Demon God statue.