C3

, also known as C cube is a Japanese light novel series written by Hazuki Minase, with illustrations by Sasorigatame. The series began publication on September 10, 2007 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Yachi Haruaki is a high school boy. He is naturally resistant to curse and his father Honatsu sends him cursed instruments called "Worse" to let him break the curse. One day, Haruaki receives a black cube from Honatsu.

At the night, he encounters a naked silver haired girl stealing rice crackers. She is the human-form of the black cube, an instrument of torture called "Fear in Cube". Haruaki and the girl 'Fear' fight together against other 'Worse' instruments and their owners using Fear's 32 mechanisms of torture.

C³
An anime adaptation of the light novel aired for 12 episodes between October 1, 2011 and December 17, 2011.