mother of sugar cane fields

A mother, Nana, and her son, Satoshi, move to an isolated island in the south with no family. The two were stepparents, and Satoshi was her husband Ryoji's stepchild, but they fled to this island together to protect Satoshi from the violent Ryoji. Nana works hard in a vast sugar cane field in unfamiliar territory, and soon attracts the attention of a local man, but Satoshi desperately protects her. Not just as a mother, but as a woman... Nana also accepts Satoshi's feelings, but at that moment, Ryoji appears in front of them...