Ai no Gakko 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.net)