- Voice Actor (CV)
- Ibuki Kido
- Gender
- Female
- Role
- Supporting
- Identity
- The commanding president of GJ-bu Middle School division and younger sister of the protagonist Kyoya Shinomiya
Personality
brother-obsessed
domineering and headstrong
math olympiad prodigy
fiercely jealous
Kasumi Shinomiya serves as the central figure of GJ-bu Middle School, wielding authority over the club with an iron will that starkly contrasts her gentle older brother Kyoya's demeanor. Fiercely possessive of her brother, she keeps a sharp eye on any girl who dares get close to him and has made a habit of claiming his room as her own territory. Beyond her stubborn exterior, however, lies a remarkable mathematical intellect capable of competing at the Math Olympiad level, making her a character of surprising depth.