あずまんが大王 THE ANIMATION

Ten-year-old prodigy Chiyo Mihama skips ahead to high school, where her new classmates include Tomo Takino, a hyperactive loudmouth, and Sakaki, a tall stoic girl who secretly adores cute animals. Rounding out the group is Ayumu Kasuga, a spaced-out transfer student from Osaka whom everyone just calls Osaka. Their homeroom teacher Yukari Tanizaki is barely more responsible than the students. Over three school years, the group drifts through classes, culture festivals, summer trips, and the slow approach of graduation.