Mitsuki Katsura, a Japanese woman in her mid-fifties, is a French-language instructor at a private university in Tokyo. Her husband, whom she met in Paris, is a professor at another private university. He is having an affair with a much younger woman. In addition to her husband's infidelity, Mitsuki must deal with her ailing eighty-something mother, a demanding, self-absorbed woman who is far from the image of the patient, self-sacrificing Japanese matriarch. Mitsuki finds herself guiltily dreaming of the day when her mother will finally pass on. While doing everything she can to ensure her mother's happiness, she grows weary of the responsibilities of being a doting daughter and worries she is sacrificing her chance to find fulfilment in her middle age.