Gregor, called Kakeru Daichi in the original Japanese version, is a gifted young soccer player who transfers to Kitahara Elementary School. He joins the school's perpetually losing soccer team, considered the province's weakest after 23 consecutive defeats, preventing its disbandment with his infectious enthusiasm and competitive spirit.

His exceptional skills, honed with the renowned youth team "The Falcons," make him Kitahara's offensive leader and primary striker. Despite offers from stronger teams, he declines, focused on winning the national tournament with Kitahara and popularizing soccer across Japan.

Gregor ignites the team's spirit by challenging the formidable rival Nanyo FC, captained by skilled goalkeeper Uesugi. His successful third penalty in a shootout secures a formal match, boosting morale and inspiring rigorous training. He later helps secure a new practice location near a Shinto shrine after disruptions from the basketball team.

Characterized by unwavering optimism, humility, and fairness, Gregor consistently encourages teammates through setbacks, prioritizing collective effort over individual glory. This fosters camaraderie and unifies the team during conflicts. His resilience shows when he continues playing despite an injury from a motorbike accident that hampers his rotary movement.

He develops a respectful rivalry with Uesugi, who recognizes his abilities and offers advice to improve team performance. Gregor's leadership proves crucial during internal divisions, especially after the arrival of the disruptive but talented Harry fractures team cohesion. Gregor's dedication to teamwork helps reunite the players and secure victory against Harry's makeshift team.

Throughout the series, his encouragement and relentless positivity form the team's emotional core, driving them to surpass their underdog reputation and achieve significant progress in competitions.