- Voice Actor (CV)
- Yuuichirou Umehara
- Gender
- Male
- Age
- 16
- Birthday
- January 7
- Role
- Protagonist
- Identity
- A member of Yumegaoka High School's diving club and the twin younger brother of club president Ai Ninomiya
Personality
Reserved
Level-headed
Considerate
Sentimental
Makoto Ninomiya is a student at Yumegaoka High School and a dedicated member of its diving club. As the twin brother of the hot-tempered club president Ai, he stands in quiet contrast to her fiery personality—calm, composed, and unfailingly gentle. Though he often finds himself on the receiving end of his sister's stress-fueled outbursts, he never wavers in his protective care for her. With a deep attachment to memories and cherished mementos, Makoto serves as the club's grounding presence and voice of reason.