C³
English name: C³ - CubexCursedxCurious
Genres: Action, Comedy, Supernatural, Ecchi
Type: TV, Episodes: 12
Aired: Oct 1, 2011 to Dec 17, 2011
Studio: SILVER LINK.
Source: Light novel
Rating: R - 17+ (violence & profanity)
Synopsis:
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.

(Source: FUNimation)