Chifuyu Orimura is a prominent character in the anime series IS: Infinite Stratos. She is the older sister of the protagonist, Ichika Orimura, and serves as the homeroom teacher for the main class at the IS Academy. Renowned for her strict discipline, exceptional combat skills, and legendary status as a former IS pilot, Chifuyu is a respected authority figure. Her complex relationship with her brother and her mysterious past play significant roles in the development of the story.