Ryo Tanaka trains at the Akasaka-style dojo and transfers to Nan High School with Riko Akasaka, quietly cherishing feelings for her despite their contrasting personalities—his earnest integrity clashes with her playful trickery. Though initially frail, he confronts delinquents head-on, driven by an unshakable resolve to protect others. Over time, his combat skills grow, enabling him to rival formidable foes like Takashi Mitsuhashi. While not the most naturally gifted fighter, his relentless perseverance and unwavering fairness earn him peers’ respect, who affectionately call him "Ryou-kun" due to his close ties to Riko and their shared status as transfers. As a junior member of the Akasaka dojo, Ryo occasionally clashes with Mitsuhashi during the latter’s intrusions, inadvertently straining relations between Riko’s father and the delinquent. His moral code aligns with Shinji Itō’s, though he prioritizes diplomacy over direct confrontation. Primarily, he supports Riko and bridges interactions among central characters, maintaining his core principles without major personal evolution across official narratives.