She is a 15-year-old girl in her second year of high school and is in the same class as Hirose Yuushin. She is best friends with Nakano Ritsuka, who has been friends with her since kindergarten. Her blood type is A. Hiyori is a very tiny girl with a height of 142 centimeters. She is the smallest in her class and is often referred to be a middle schooler because of her size. She is often called "Hiyorin" because she thinks she is small and cute, like a chick.