A young girl who is part of Human Subject, her life will always stay the same. Nothing new and nothing will never change...

The Peaceful day is gone by the sudden apocalypse..will they ever escape this horror?

Takayama Aoi is a nice and beautiful girl. But she's one of the users who possesses special magic, and people call those users "demons."

A girl named Araya Mika has a tragic past and is constantly living in this hell. While she's thinking of ending her life on this lonely rooftop, will someone be there to stop her?