Shinryouji Hisui

Hisui is Masato and Ria's childhood friend. Previously very kind, very close to Masato and very passionate about stars, Hisui is now a true ice princess. Impossible to approach, close to no one and always isolated. Schoolwise, however, Hisui remains an excellent student, being ranked as the second best student in every subjects.

Some students think that her behaviour is the result of her anxiety about the responsibilities she is trapped in, she is the heir to a long line of "heros" school principal is a member] who used AD technologies, and that her position as "Second" shakes her a lot (even if the first is never the same in all subjects).