In the light novel series penned by Minase Hazuki, an engaging tale of romance, adventure, and humor unfolds. Yachi Haruaki, a high school student with an unusual immunity to curses, receives a cryptic black cube from his father. To his surprise, this gift unveils a naked girl named Fear, the tangible embodiment of the cursed cube and a tool of torment. With her unique powers, Fear joins forces with Haruaki in battling against other cursed artifacts and their wielders.