Gakkyuu Ou Yamazaki

Referring to himself using the royal "we," the three spikes of his hair pointing to the heavens like a crown, Yamazaki, a boy who claims to be a prince, transfers into Crown Elementary School--accompanied by his loyal servant, of course. In doing so, he has only one goal: to make his new class into a territory of his kingdom! Since the rest of his class is, naturally, opposed to that idea, this children's gag comedy tells the story of all the ridiculous means he employs to try to bring class 6-3 under his rule.

(Source: Baka-Updates Manga)