of Japan. Kanzashi is a fan of anime heroes. Despite being an IS Representative, she does not have a personal IS. The company that was developing her personal IS also produced the Byakushiki. Due to Ichika's rise in fame, the development of his IS unit was given priority over hers, and as a result, she harbors a resentment towards Ichika, not that he had anything to do with the decision. In addition, Kanzashi has always competed against her older sister and feels incompetent when compared to her. However, thanks to Ichika's efforts (unaware of Tatenashi's assistance until later), her IS the is made operational. Kanzashi falls in love with Ichika for his kindness in helping her, and her view towards Tatenashi changes when she realizes that she has been competing with an idealized conception of Tatenashi and comes to be more accepting of her own accomplishments. IS Academy staff Chifuyu is Ichika's 24-year-old older sister, and homeroom teacher of his class at the Academy. She was the Japanese pilot for the first-generation IS machines and was said to be the strongest IS pilot at one point before retiring. During her retirement, she looked after her brother and raised him by herself after their parents abandoned them at a young age. Despite her indifference towards Ichika, Chifuyu deeply cares for her brother, as she sees him as her only family. Chifuyu was also the one who enrolled Ichika to the IS Academy to keep him safe from other countries. Chifuyu once wielded Yukihira, a powerful IS energy blade now in Ichika's possession. Chifuyu was a close friend of Tabane Shinonono, which explains how their younger siblings became childhood friends. Tabane also implies (heavily) that Chifuyu piloted the –the first ever developed IS that protected Japan when 2,341 missiles were launched towards the country simultaneously due to a hack 10 years prior to the series. Her IS currently is called the Kurezakura. Yamada is the substitute instructor of Ichika's class, possessing a noticeably large bust. She used to be an IS Representative Cadet of Japan. In the anime, her skills become very apparent, as during a training exercise she was able to single-handedly defeat both Cecilia and Lingyin, in their personal IS units, using only a mass-produced Rafale Revive IS. Phantom Task Madoka is Chifuyu and Ichika's younger sister and twin sister who has a striking resemblance to Chifuyu and harbors a