At Sandman Junior High School, Gaspard, Jules and Loba are three unpopular, marginal teens. One evening, they stumble upon a mindboggling object in their school basement: a dream-travel machine! They can’t resist this tempting opportunity to mess around with their schoolmates’ dreams. Thus, they break the primary rule about never altering the course of any dream! This upsets the balance maintained by Asibikaashi, the guardian of the DreamCatcher, and a wave of nightmares contaminates the school.