Moon of the Plateau [高原の月]

An older sister and brother (Mieko Takamine and Masayoshi Otsuka) come to visit their grandfather (Takeshi Sakamoto) who lives deep in the mountains. As for their parents, father was serving in the South Seas and mother died of illness on her way home. So, the brother, who is still young, will live alone with his grandfather whilst the sister goes away to study to become a teacher.