Heli-Tako Puu-chan

In a southern island called the "Whale Island" a strange creature fell suddenly from the sky. It crashed into a school, and squashed the frog teacher flat! This strange creature's name was Puchan. He somehow managed to get the frog teacher back into shape, but the classmates are suspicious of this newcomer.

But soon, everyone finds Puchan very fun to be with, and Puchan joins the school. Puchan encounters many happenings at the school but each time, he somehow manages to get through them with his curious ways.

(Source: AniList.co)