Fear is the female protagonist of C³. She claims to be a "cursed tool" that has been exposed to so much hatred and negativity that it allowed her to gain a consciousness, and says that she came to Haruaki's home in hopes of purifying her "curse". She's actually a fictitious device called Fear In Cube, a terrible torture device from the Inquisitions.
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From the light novel series written by Minase Hazuki, comes a story of love, action, and comedy. Yachi Haruaki is a high school boy who is naturally resistant to curses. After his father sends him a mysterious black cube, Haruaki awakes to find a nude girl named Fear standing in his kitchen. She’s the human form of the cursed black cube – and an instrument of torture! Utilizing her special abilities, Fear fights alongside Haruaki to defeat other cursed instruments and their owners.
