Yachi Haruaki is a high school student. He possesses a natural resistance to curses, and his father, Honatsu, sends him cursed objects known as "Worse" for him to break. One day, Haruaki receives a black cube from Honatsu. That night, he encounters a naked girl with silver hair stealing rice crackers. She is the human form of the black cube, a torture instrument called "Fear in Cube." Haruaki and the girl, 'Fear', fight together against other "Worse" instruments and their owners, utilizing Fear's 32 mechanisms of torture.