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Yachi Haruaki is a high school boy with a unique resistance to curses. His father, Honatsu, regularly sends him cursed artifacts known as "Worse" items so that Haruaki can nullify their malevolent effects. One day, he receives a mysterious black cube among these deliveries. That night, his life changes when he discovers a naked, silver-haired girl in his home—she is the human manifestation of that very cube, a sentient torture device named Fear.

Fear, the "Fear in Cube," can transform into 32 different instruments of torment. As Haruaki and Fear begin living together, they are drawn into conflicts against other dangerous "Worse" artifacts and their wielders. Haruaki must use his unique immunity while navigating this new reality alongside his formidable and unusual companion.

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