High schooler Yomogi comes across Gauma, a strange drifter claiming to be a Kaiju User. Soon after, a Kaiju attacks, and Gauma summons the giant robot Dynazenon to fight it. Yomogi, his classmate Yume, and local NEET Koyomi are caught in the chaos and join as copilots. Together, they form the Gauma Team. But Kaiju Eugenicists, a secret society of teens with special powers, stand in their way.