- Voice Actor (CV)
- Saori Oonishi
- Gender
- Female
- Age
- 16
- Birthday
- January 7
- Role
- Protagonist
- Identity
- A second-year student at Yumegaoka High School who serves as the president of the diving club and is the twin older sister of Makoto Ninomiya
Personality
Candid and outgoing
Dependable and mature
Tough exterior with a gentle heart
Short-tempered
Ai Ninomiya is a second-year student at Yumegaoka High School and the driving force behind the school's diving club as its president. Known for her candid personality and big-sister energy, she guides her fellow club members with confidence and warmth. However, her composed demeanor crumbles the moment her twin brother Makoto is involved—her temper flares and fists fly. Beneath her fierce surface lies a deeply caring soul with an unwavering sense of responsibility, making her the true pillar that holds the club together.