A kid from another planet decides world conquest starts in the classroom, then spends half his time just tormenting the class rep for fun. Every episode is a fresh scheme that somehow loops back to chaos nobody saw coming. The comedy lives in how seriously Yamazaki takes ridiculous missions while his classmates, his alien dog, and pure accident make everything worse.
An alien invader named Yamazaki touches down on Earth with one objective: planetary conquest. But he quickly learns that before he can rule the world, he needs to master something far more challenging: his middle school classroom. Armed with wild schemes and boundless ambition, Yamazaki sets out to bend his classmates to his will, transforming ordinary school days into absolute chaos. His favorite target is Tatsuya, the dutiful class representative, who becomes the unfortunate focus of Yamazaki's relentless pranks and power plays. Backed by his eccentric grandparents and his loyal, oddball dog Watanabe, Yamazaki throws himself into increasingly ridiculous plots to establish dominance over his peers. What began as a calculated step toward world domination somehow spirals into something far more consuming: the genuine desire to become the undisputed King of the Class. Comedy unfolds as Yamazaki's grand ambitions repeatedly crumble against the stubborn realities of school life, friendship, and the unexpected chaos that comes with both.