Tags: Manga.
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 eating rice crackers. Haruaki then has to protect Fear from organizations that seek to capture or destroy her.