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High school student Yachi Haruaki possesses a natural resistance to curses. His father, Honatsu, regularly sends him cursed instruments known as "Worse" to help him break their curses. One day, Haruaki receives a mysterious, heavy black cube from his father. That night, he encounters a naked, silver-haired girl stealing rice crackers in his kitchen. This girl, named Fear, is the human manifestation of the black cube, which is revealed to be a torture instrument called "Fear in Cube."