Yumeji Fujiwara, a high school student with the ability to give insight into one's dreams, has been forced into battles and misfortune caused by the nightmares that live inside people's dreams. Trapped inside his own dream, he is forced to fight against an army of cats lead by a dream demon who goes by the name Chaser John Doe. When Yumeji meets Merry, another dream demon who suffers from amnesia and is fighting to return to the dream realm, the two decide to become a team. Together they battle foes and gather the answers needed to try and send Merry home.