Toshinta Tomoe is a short-statured young man intensely driven to join his high school judo club, honoring the legacy of his mother, Teruko, a former judo champion. His family background deeply fuels his dedication; Teruko acts as both a source of pressure and inspiration. She imposes strict performance expectations, threatening severe consequences like "chopping him into tuna" for failure, yet also expresses pride in his achievements and teaches him specialized techniques.

Tomoe possesses a determined, occasionally reckless personality. As the sole member of his high school's judo club, he actively recruits by challenging other students to matches, demonstrating persistent effort to revitalize the club. His judo approach blends traditional training with unorthodox methods, including the development of risky signature moves like the "Tomoe Tornado Drop," a dynamic diagonal variation of the standard tomoe nage throw. This technique involves using his foot to lift and spin an opponent, culminating in a high-impact throw that risks injury to both participants, reflecting his willingness to stake personal safety for victory.

His character development focuses on overcoming challenges through judo. In a pivotal match against Banji Suke, Tomoe employs the Tornado Drop despite its risks, achieving a draw. This outcome earns him respect from his opponent and fulfills his immediate goal of recruiting club members. His mother acknowledges this as proof of his "Chutzpa" (fighting spirit), marking a transition from insecurity to validated determination.

In extended narratives, Tomoe encounters a mysterious teacher, Ryuhei Togama, at Chiba Prefectural Koyo High School. This relationship introduces external elements like the "Honor Fighting Force," which becomes involved in Tomoe's conflicts and adventures, expanding his story beyond sports into broader confrontations.