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A mother, Nana, and her son, Satoshi, have moved to an isolated island in the south with no relatives. The two are father and son-in-law, and Satoshi was a stepchild of her husband, Ryoji, but they escaped to this island together to protect Satoshi from the violent Ryoji. Nana, who works hard in a vast sugar cane field in an unfamiliar land, is soon spotted by a local man, but Satoshi desperately protects her. Not as a mother, but as a woman... Nana also accepts Satoshi's feelings, but at that time, Ryoji appears in front of them.