Aina Rumika

She is a woman of average height with long blonde hair and yellowish/brown eyes. She is the homeroom teacher of Sakura Hibiki. She is first seen, announcing the members of the track team. She and Kure Yakusha go to return Satomi's gym card and join the gym themselves. She is one of the few characters which are not freaked out by Machio flexing and tearing his clothes, being more interested in his advice. Like Yakusha and Satomi, she is angered by quips about her age.