Chibideka monogatari

A poignant children's film about Oyama, a new kid in school, who is teased for being fat until Komatsu shows him that he has to believe in himself. Komatsu's attempt to help Oyama master the rope climb in gym class is particularly memorable. Quite popular in the United States due to repeated showings on The CBS Children's Film Festival in the 1960s and 70s. - IMDb