- Voice Actor (CV)
- Atsumi Tanezaki
- Gender
- Female
- Age
- 16-17
- Birthday
- October 23
- Role
- Protagonist
- Identity
- A second-year student at Minegahara High School who serves as both the founder and sole member of the school's Science Club
Personality
Composed
Razor-sharp logic
Tsundere tendencies
Hidden loneliness
Known by the nickname 'Rational Witch,' Rio Futaba is a science-minded girl who consistently uses empirical reasoning to help Sakuta Azusagawa make sense of the mysterious Adolescence Syndrome. Beneath her composed, logic-driven exterior lies a heart quietly aching from isolation and self-doubt. In the third volume, her long-suppressed identity crisis erupts into a full-blown case of Adolescence Syndrome, splitting her into two distinct versions of herself.