Komari is an eighth grade middle school student of the Asahigaoka Branch School. She is 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. Komari 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.