Komari Koshigaya

Age: 14
Birthdate: September 14
Height: 140 cm (according to herself. The Lost child centre staff estimated her as "about 130 cm tall.")
Blood type: AB
Likes: sweet foods
Dislikes: natto

Komari is a second-year middle school student of the Asahigaoka Branch School. She is Yukiko's eldest daughter, Suguru's younger sister, and Natsumi's elder sister. She is quite short, which she has a complex about. Because of her height, she is usually mistaken for a child.

She longs to be a mature adult but is often easily scared, something which Natsumi takes advantage of. Still, she is shown to be responsible and looks out for her friends. She is bad at cooking.