Ai no Gakkou Cuore Monogatari

Enrico Pocchini is a kind-hearted schoolboy with a strong sense of justice who lives in the Italian town of Torino. As a new term starts, he loses his beloved teacher, Miss Delacci, who is replaced by the stern Sr. Pelboni. Eventually, the boys in Enrico's class come to respect Sr. Pelboni, and learn about love, life and human kindness.

(Source: AniDB)