Kousei Matsubara is a central character in the anime series 'Giant Killing.' He plays the role of a defender for the East Tokyo United (ETU) football club. Known for his robust defensive skills and strategic mindset, Matsubara is a key player in the team's efforts to rise in the league standings. His experience and leadership on the field are invaluable, providing stability and guidance to his teammates. Matsubara's dedication and passion for the game make him a fan favorite and a respected member of the team.