In 1923, in the province of Shinshu, the widow and simple worker of a silk factory Tsune Nonomiya (O-Tsune) decides to send her only son to Tokyo for having a better education. Thirteen years later, she visits her son Ryosuke Nonomiya (Shinichi Himori), and finds that he is a poor and frustrated night-school teacher with a wife, Sugiko (Yoshiko Tsubouchi), and a baby boy.