The Lafevre family was massacred leaving behind Mary and Rose as the only survivor. Waking up not knowing everything, Mary ought to protect her sister, Rose, from happening the same tragedy again and does include hating humanity.
One day a guy called Mack got lost and found himself in an old mansion. Meeting Rose which he seek for help. While Mary hated the idea of Mack knowing them, Rose and Mack started to became a very good friend.