Sasami Tsukuyomi

Sasami is a first-year high school student who lives with her older brother Kamiomi. She is a hikikomori (shut-in) and initially refuses to even go to school, but she later begins attending school in February near the end of her first year in high school. At home, Sasami uses a "Brother Surveillance Tool" on her computer to view the outside world.

(Source: Wikipedia)