Aria is sure she’s going insane. Spontaneous rooftop walks over skyscrapers, the ruins of ancient castles, or amaranth fields strewn with the dead bodies of awful monsters—nightmares don’t leave her even for a single night. But everything changes when, during one of her journeys, she meets a stranger who makes the invented and real worlds intersect, showing the girl a completely different reality. Parallel dimensions really do exist! And demons that come when night falls—also. But it’s not actually them you should be afraid of…