Height: 140-142 cm
Hiyori has a height of 140 centimeters and is very shy. She is referred as cute by her classmates, specially by Natsuki and Yuushin. Her best friend is Ritsuka, who she has met since kindergarten. Her nicknames are Hiyo (used by Ritsuka) and Hiyorin (used by Yuushin and other classmates). Hiyori admires Yuushin because he can make friends easily, while she can't. Later, she falls in love with him. Hiyori also has a cat named Pui-pui, which was found by Yuushin in the school grounds.