A humongous otherworldly being arises on the horizon of a Japanese metropolis, triggering anticipated responses - the Japan Self-Defense Forces activate their tanks as the populace falls into a frenzy. The creature's origin and characteristics are nebulous, but Yuki, a bold and inquisitive teenage girl, might possess a crucial piece of information. Tetsu, her confidant, has been surreptitiously tending to a peculiar creature named Cenco, whose remarkable and implausible abilities are about to come to light. A mysterious adolescent, whose murky links to the monstrous entity besieging the city unravel the connections, makes a surprising entrance. His intrusive curiosity about Tetsu's exceptional pet ends all doubts of a connection - and ignites an imminent conflict.