Shingo Tamai, a first-year Shinsei High School student, embodies fiery rebellion and raw athleticism, asserting himself as the self-styled "school boss" through frequent brawls and clashes with peers. His combative streak targets Tempei Matsuki, the new soccer coach, prompting Shingo to rally a rival team against Matsuki’s authority.

Orphaned young, Shingo was adopted by Rinkichi and Kimie Tamai after his biological father Makoto Nagata—a passionate football mentor who crafted handmade balls and coached local children—succumbed to cirrhosis. Though Shingo later learns of his adoption, he remains fiercely loyal to his adoptive family while channeling his birth father’s legacy into football. His working-class roots contrast with peers like affluent Hikaru Aota; their early rivalry softens into mutual respect as Hikaru confronts his own past selfishness.

Early defeats against Matsuki’s team force Shingo to abandon his selfish, reckless playstyle. He evolves from seeking personal glory to embracing teamwork, eventually captaining the unified school squad. His submarine shot—a blend of brute force and precision—mirrors this growth. A critical mid-match injury threatens his resolve, but mentorship from Matsuki’s allies and validation from elite players spur his recovery and return.

Interpersonal tensions shape his journey: volatile exchanges with goalkeeper Yosuke Ohira balance rivalry with camaraderie, while initial hostility toward Matsuki gives way to shared respect for their sport. Figures like Ryoko Asuka challenge his impulsivity, pushing him toward accountability.

Once an abrasive outsider, Shingo emerges as a unifying leader, rallying diverse teammates to national and international prominence. His arc intertwines identity, legacy, and grit, anchored by loyalty, blunt honesty, and an unyielding drive for justice.