Yukihiro Aida

Yukihiro Aida is a student at Yotsuba High School who shares a close friendship with the story's main characters. Displaying a level of maturity that surpasses his peers, he is among the few who know about Tsunagi Tobikou's mixed-race background, quietly taking on the role of keeping that secret safe. While he is enthusiastic about basketball and has an upbeat personality, he consistently offers calm, objective support whenever his friends find themselves caught in racial prejudice or emotional struggles, making him the most dependable and warm-hearted presence in the protagonist group.