Akasaka, Riko

赤坂理子

The sole daughter of the Akasaka dojo. She initially attended a different senior high school than Mitsuhashi and Itou, but eventually chose to transfer to Nanyou High to repay a favor to Mitsuhashi. Although she has a small stature and an innocent look, her proficiency in Aikido allows her to deal with most delinquents by herself.
She was once very popular at her previous school, but at Nanyou High she is viewed as somewhat odd for always sticking with Mitsuhashi. As the manga progresses, her initially reserved nature slowly shifts into a more cheerful demeanor, influenced by Mitsuhashi. She harbors a crush on Mitsuhashi and is the only one who calls him "San-chan".