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 named Yamazaki arrives on Earth from another planet, set on conquering it. He soon realizes that before he can rule the world, he has to win over his own classroom. Armed with one wild scheme after another, he tries to get every classmate to follow his lead. Much of his energy also goes into making life miserable for Tatsuya, the class representative. With his loyal and strange dog Watanabe always at his side and help from his grandparents, Yamazaki keeps pulling his class into crazy antics. Along the way he forgets his original mission entirely and cares only about becoming the King of the Class. The result is a comedy built on his outlandish classroom schemes.