Junta Teshima, an "ordinary" cyclist frustrated by consistent losses despite strong strategy, developed resentment towards elite riders. After placing 43rd in his final middle school race while rival Shunsuke Imaizumi won, he planned to quit cycling. Entering Sohoku High School, observing Hajime Aoyagi struggle up a slope sparked his interest. Introducing himself, Teshima felt a kinship with Aoyagi as fellow average cyclists, inspiring him to continue. They joined the bicycle racing club together and became classmates. Teshima and Aoyagi formed the "team of two," combining Teshima's strategic planning with Aoyagi's physical capabilities, winning five of six races in their first year. Teshima managed Aoyagi's stamina using precise power percentages during races. Their gloves symbolized their dynamic: Teshima's read "certain," Aoyagi's "victory." Their bond grew exceptionally strong, enabling near-telepathic communication in competition. Initially displaying subtle hostility towards first-years to secure Inter High spots, Teshima challenged newcomers Naruko, Imaizumi, and Onoda to a race with Aoyagi during a camp. They lost, straining themselves to withdrawal, yet Teshima later supported Onoda's 1000km effort with upgraded pedals. Not selected for the 41st Inter High team, Teshima served in support, distributing supplies and offering encouragement. He assisted teammates during setbacks like Onoda falling behind or Tadokoro experiencing difficulties. His sportsmanship showed when he paused a competition with Sangaku Manami after learning of Manami's mechanical issues. After third-years graduated, Teshima became team captain with Aoyagi as vice-captain. To secure his Inter High spot, he defeated teammate Kimitaka Koga in a race. As captain, he demonstrated leadership: advising Imaizumi to acknowledge teammates' efforts, granting Naruko leave to reconsider his cycling future, and mentoring younger members. Intensified training significantly strengthened his legs, enabling him and Aoyagi to outperform Naruko and Imaizumi in a flat race during their third year. Teshima possesses high strategic intelligence but lacks elite physical talent. He specializes in psychological tactics, disrupting opponents' pacing through mockery and precise blocking. Yusuke Makishima assessed him as better suited for climbing than sprinting due to mediocre technique and an inability to win official sprints. His observational skills motivate teammates; he once prompted Onoda by comparing opponent Takuto Ashikiba to Makishima's distinctive riding style. He favors Cannondale bicycles, particularly the Supersix Evo and Hooligan Road models, highlighted in collaborative promotions. As captain during the 42nd Inter High (*Limit Break*), he leads Sohoku's pursuit of back-to-back championships against rivals like Hakone Academy and Kyoto Fushimi. He also appears in the mobile game *Yowamushi Pedal Dream Race* as a limited-time event racer. Teshima's hobbies include singing J-pop in the shower and karaoke, performing impression medleys. He enjoys sports manga, resting in bed post-practice, and Japanese curry. Academically, he excels in mathematics and competed in prefectural abacus tournaments during middle school.