Nagisa Akutsu is a second-year student at the Tokyo City Esperion Youth academy and plays as a centre back for the A team. He is a tall and muscular teenager with a buzz cut. Akutsu is the only player from his generation to have passed the selection process, and he has been a regular first-team defender since his freshman year. On the field, he is recognized for his defensive genius, using his strong build and sharp instincts to shut down opponents. His playing style is aggressive and commanding, and he wears jersey number 4.

Off the pitch, Akutsu is stoic and has a rough temperament. He often clashes with his teammates due to his hot-tempered and insulting behavior, which makes him difficult to approach. His attitude stems from a fiercely competitive nature and a desire to assert his dominance. He holds a particular animosity toward Ashito Aoi, whom he faced during the selection process, and after joining the team he frequently tries to overpower or crush him. Akutsu’s motivations are driven by a relentless pursuit of excellence and a refusal to tolerate anything he perceives as weakness. In the story, he serves as a formidable rival and a constant challenge for the younger players, especially Ashito, pushing them to elevate their own game. Despite his abrasive exterior, his abilities make him an indispensable asset to Esperion’s defense, and his presence raises the competitive intensity within the team. His development is marked by the tension he creates and the grudging respect his talent commands from those around him.