Kiwa Funaki is a young successful kimono designer working at her family's Kyoto-based business. While she fends off both the admiration of young painter Goro and the obtrusive advances of business partner Omiya, she eventually falls in love with scientist Takemura, who is writing a paper on the Shojobae fly. After she has started an affair with him, Kiwa learns that Takemura has a wife terminally ill with tuberculosis. When Takemura's wife finally dies, he proposes to her, but Kiwa, criticising him for his egotism, chooses her independence over the prospect of becoming his wife.