When Yomogi Asanaka, a first-year student at Fujiyokidai High School, meets Gauma, he claims to be a "kaiju user." But the appearance of a kaiju followed by the entry of the gigantic robot, Dynazenon, backs up his mysterious words. And after Yume Minami, Koyomi Yamanaka, and Chise Asukagawa end up in the wrong place at the wrong time; they get dragged into the desperate fight against the kaiju!