C³

C³, also known as C Cube (シーキューブ, Shīkyūbu) or Cube×Cursed×Curious, is a Japanese light novel series written by Hazuki Minase and illustrated by Sasorigatame about Haruaki Yachi who receives a mysterious black cube from his father. That night, Haruaki is woken by a noise and finds a nude girl named Fear in his kitchen. In 2011, it was adapted into a manga and anime series.

Story
Haruaki Yachi is a high school student living alone in an old solitary home. When he wakes to a suspicious sound in his kitchen, he finds... a naked rice thief. The woman calls herself "Fear" and claims to be a cursed tool who has come Yachi's home to remove her curse. Since he's affected by the curse, Fear ends up moving in with Haruaki, and that's where the story begins.

A wide variety of organizations are out to worship, study, or even destroy this cursed tool, however--, so it's up to Haruaki and his neighbors Konoha and Kuroe, to fight them and defend Fear, who is no slouch herself. Lots of action (and some occasional fan service) ensues!