Chifuyu Orimura

Chifuyu Orimura is Ichika's 24-year-old older sister and the teacher in charge of his class at IS Academy. A former Japanese pilot of the first-generation IS machines, she was once said to be the strongest IS pilot before retiring. She raised Ichika after their parents abandoned them, later enrolling him at IS Academy for his safety. Chifuyu once wielded the powerful IS energy blade Yukihira and was a close friend of IS creator Tabane Shinonono.