If it weren't for a strange ability that only became obvious 10 years ago, Yumeji Hujiwara would be an ordinary teenage girl. Others' colored auras can be seen by him, and they can show him what kind of dream the subject would experience. Yumeji has a recurring nightmare in which he is running from cats, making it simple for him to foresee his own nightmares even without an aura. And things continue to deteriorate in the dream. But then, to his surprise, he receives assistance from Merry Nightmare, a young woman who seemingly descended from the skies and is a nightmare in her own right.
