Takeshi Tatsumi is a central character in the anime series 'Giant Killing.' As the main protagonist, he is a former soccer player who returns to Japan after a successful career in Europe. Takeshi takes on the challenging role of head coach for East Tokyo United (ETU), a struggling soccer team. His unconventional methods and strategic thinking aim to revive the team's fortunes and challenge the league's giants. Takeshi's charismatic leadership and deep understanding of the game inspire his players, making him a pivotal figure in the team's journey to success.