A boy who kills nightmares and a girl who lives them. In the modern age, communication technology has developed that uses dreams as a medium instead of electrons. In the world of “shared dreams,” people are engaged in economic activities even when they are asleep. A malignant factor that invades artificial dreams and destroys the mind, “Nightmares (Noise)” …… There are those who make a living out of suppressing them with force. They were called “tapirs” by the people, who likened them to dream-eating beasts. One day, Touya Rumaki, a high school student who carries out his duties as a “tapir,” finds himself in a situation where he is unable to find a way out. He meets a “witch” in a wheelchair. The girl, who called herself “Meia”, stretched out her body, which was not free in any way, to Touya and whispered to him like a spell. “I’ve been betrayed by everything in this world. And when the wishes of a boy hunting nightmares and a fragile girl intersect The nightmare that has been called a disaster, “The Beast’s Dream,” awakens. This is the beginning of a dark battle of science fiction and otherworldly powers that will distort the world! With “Gahou”!