One day, Asanaka Yomogi, a first-year student at Fujiyokidai High School, runs into a mysterious man named Gauma who claims to be a "kaiju user." The sudden appearance of a kaiju is followed by the entry of the gigantic robot, Dynazenon. In the wrong place at the wrong time are Minami Yume, Yamanaka Koyomi, and Asukagawa Chise, who are dragged into the fight against the kaiju.