Danshou no Grimm

It is said that all unexplainable mysteries that occur in our world is part of the fragments of "God's nightmares". When these nightmares floats into people minds, they are mixed together with their fear, ill intentions and insanity. Bit by bit as the world is manipulated, it creates the tales of nightmare.
Shirano Aoi, a boy who treasures his ordinary daily life and Tokitsuki Yukino, a girl who is haunted by her past encounters each other in "Cinderella's Nightmare", which was created by humans insanity. What is the fate awaiting for them——!?