Yamazaki arrives on Earth from another planet with the intention of conquering the world. He quickly realizes that to achieve that goal he must first conquer his own classroom. Determined, he devises numerous schemes to win over his classmates and keeps Tatsuya, the class representative, at the center of his plots. With his loyal, eccentric dog Watanabe by his side and the support of his grandparents, Yamazaki throws himself into outrageous antics that keep him distracted from his original mission, focusing instead on becoming the “King of the Class.”