One of the heroines. The representative cadet from the United Kingdom. A true high-born lady born into a prestigious noble family. While she has refined manners, she is actually vain and childish. Her cooking is disastrous. Personal Unit: Blue Tears

One of the heroines. The first childhood friend of Ichika and Guest. A traditional Japanese beauty. At first glance, she appears to be a dignified, stoic, and reliable person, but her mental state is quite fragile. She has a tsundere personality, being clumsy and unable to be honest with her feelings. Personal Unit: Akatsubaki

One of the heroines. The second childhood friend of Ichika and Guest. The national representative cadet from China. Her nickname is Rin. She is devoted and enjoys taking care of others. While she has a bright personality, she is a tsundere. Personal Unit: Shenlong

One of the heroines. The representative cadet from France. The daughter (born to a mistress) of the major IS company "Dunois." Initially, she claimed to be the second male IS pilot after Ichika Orimura (or the third if Guest is male) and transferred to the IS Academy under the pseudonym "Charles Dunois." She generally has a reserved and gentle personality. Personal Unit: Rafale Revive Custom II

One of the heroines. A representative cadet from Germany who transferred to the IS Academy. Commander of the IS special forces unit "Schwarzer Hase" (Black Rabbit Squad). Her left eye turned gold due to a failed IS compatibility transplant, leading her to be branded a "failure." She idolizes Chifuyu Orimura, the instructor who helped her recover from that situation. Perhaps due to her military background, she has a serious personality and tackles everything with full effort. Personal Unit: Schwarzer Regen

One of the heroines. A second-year student. She serves as the Student Council President of the IS Academy and is hailed as the strongest in the school. She has a younger sister, Kanzashi Sarashiki, in the year below her. While possessing a mysterious aura, she has a bright, uninhibited, and mischievous personality. Personal Unit: Mysterious Lady

One of the heroines. Tatenashi Sarashiki's younger sister. The representative cadet from Japan. As expected of a representative cadet, her potential is high, and her abilities in computational processing, information analysis, spatial awareness, and maintenance are top-tier among the heroines. She is one of the most brilliant intellectual types among the representative cadets appearing in the story. She has a shy and reserved personality. Personal Unit: Uchigane Nishiki

The original protagonist. Guest's twin brother. Chifuyu, a teacher and homeroom instructor at the IS Academy, is the older sister of Ichika and Guest. He has a detached yet good-natured personality. While he usually acts playfully, when the time comes, he does not compromise his beliefs and shows the initiative to protect his friends and loved ones. Personal Unit: Byakushiki

A teacher and homeroom instructor at the IS Academy. The older sister of Ichika and Guest. Ichika calls her "Chifuyu-nee," but she orders him to call her "Orimura-sensei" within the academy. She has a cool beauty and a strict personality that doesn't hesitate to use physical discipline, but her private life is quite slovenly. Winner of the first IS World Tournament.

A teacher and assistant homeroom instructor at the IS Academy. Quite a klutz. She has a habit of daydreaming. However, her actual skills are quite high.