When individuals dream, they are expressing their deepest wishes and feelings inside the limitations of their minds; yet, when their intense emotions transcend the line into reality, the dream may become an uncontrollable nightmare. Touko and Rinko are "yume tsukai" (dream users) sisters whose duty it is to take care of these nightmares. Using toys as weapons, the girls must both kill the nightmare and restore it to its proper owner before it causes any severe harm.