Riko Akasaka  

, 赤坂 理子

The Akasaka dojo's sole daughter initially attended a different high school than Mitsuhashi and Itou before deciding to transfer to Nanyou High. This was in repayment for Mitsuhashis kindness. Despite her small frame, she excels at Aikido and can handle most delinquents on her own. Although popular at her previous school, she is now viewed as somewhat odd at Nanyou High due to her frequent association with Mitsuhashi. As the story progresses, her reserved nature gradually transforms into a more outgoing personality under Mitsuhashis influence. She harbors feelings for him and refers to him affectionately as "San-chan".