Kingyo Chuuihou!

A girl named Chitose Fujinomiya experiences a dramatic shift in fortune after her father's death leaves her in debt and destitute. Stripped of her wealth, she is expelled from her prestigious school and left with only a pink goldfish named Gyopi-chan as a keepsake. After collapsing on the grounds of a rural junior high school, she reluctantly enrolls there despite finding its impoverished setting unfamiliar and unappealing. The school has a lively, if rough, student body and features farm animals that freely wander and sometimes attend classes.