The cause behind the strange events that suddenly occur in daily life, must be someone’s dream. To dream (Yume) - it is to imagine something strongly. The dream sometimes goes beyond one’s mind, and comes into existence in real life. The dream that crosses the border becomes a nightmare as a result, and causes much trouble. The Yume Tsukai, such as Mishima Toko and Renko, use their shamanic powers to calm nightmares. Then, they find the owner of the dream, and make the dream into what it should be.