Sumire Terasaka

Sumire is a high school student who attends the same school as Himari, Tenichi, and Honoka. She has a neatly groomed bob haircut with slightly inward-curving ends. She wears the typical girls' school uniform, which consists of a short-sleeved blouse, a large ribbon tie, and a sweater vest. She has been Himari's childhood friend since they were both three years old. Now, she is a big fan of Himari, though she keeps that a secret from her.