Yumi is a traffic officer who primarily deals with traffic accidents and hit-and-run incidents. She frequently encounters Conan and the Detective Boys while they are in the midst of solving a case, and has assisted them on numerous occasions in resolving cases and apprehending criminals. Yumi's best friend is Miwako Sato, whom she often teases regarding her feelings for Wataru Takagi. She often visits both of them to offer advice on how to express their feelings to one another; these efforts are sometimes successful, but other times the plans fail due to Takagi and Sato's shyness around each other. Yumi is allergic to cats and owns some dogs. She is considered an attractive member of the police force, yet remains single. This status allows her to take advantage of the men in the district, having them buy gifts for her in an attempt to impress her.
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