Adapted from the light novel series by Minase Hazuki, this story blends love, action, and comedy. Yachi Haruaki is a high school student with a natural resistance to curses. After his father sends him a mysterious black cube, Haruaki wakes up to find a nude girl named Fear standing in his kitchen. She is the human manifestation of the cursed black cube—and an instrument of torture! Using her special abilities, Fear fights alongside Haruaki to defeat other cursed instruments and their owners.