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Hiotan (ひおたん) is a female employee of the Uma no Hone Bookstore.

As the second newest employee, she does not have a descriptive nickname like the others. Hio, while dedicated, is a clumsy worker who frequently gets into trouble. She is easily embarrassed, and is the frequent target of Director's teasing.

She has long light brown hair. She lives alone in a run-down apartment.