Yamazaki, an extraterrestrial being, initially aimed to conquer Earth but redirected his ambition toward dominating his elementary school classroom, viewing it as essential groundwork for global control. His distinctive hairstyle stands out among primary school students. He lives with supportive grandparents and is constantly accompanied by Watanabe, his loyal non-human companion.

Yamazaki relentlessly devises elaborate plans and inventions to gain influence over classmates and undermine his declared rival, Tatsuya, the class representative. His methods involve chaotic classroom antics and scientific experiments intended to prove his superiority. These efforts often lead to comedic outcomes, sidelining his planetary conquest goal in favor of immediate classroom victories. Despite persistent determination, his strategies against Tatsuya frequently fail or backfire.

His fixation on classroom dominance consistently overshadows his broader interplanetary ambitions, maintaining consistent objectives and personality throughout the series. Official spin-offs, movies, or OVAs exploring additional background or development are not documented in available sources.