Hiotan (ひおたん) is a female employee of the Uma no Hone Bookstore. She lives with her older sister in a run-down apartment.
She has long light brown hair and blue eyes.
She is easily embarrassed, and is the frequent target of Director's teasing. 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.