Ginga Shounen Densetsu: Dog Days - Roku to Boku no Ichiban Atsukatta Hibi

The year is 1960, in a snowy mountain village in Oshu. My son, Otto, who will be starting elementary school that year, is surrounded by nature, animals, and his family. Though poor, he is absorbed in the bountiful days. His father doesn't work and spends all his time yelling at his family, his mother is compassionate, and his siblings share his father's tyranny. Otto, the youngest son, is at the mercy of his family, but he continues to embark on small adventures...

(Source: Nihonbungeisha, translated)