Koji Satake manages and head-coaches the youth team of Tokyo Musashino FC, a Tokyo-based football club and key rival to Tokyo City Esperion FC's youth B team. His players include Akinori Kaneda and Junnosuke Nakano, who once attended Esperion tryouts with Ashito Aoi. Sōichirō Tachibana, a current Esperion B team forward, was previously coached by Satake within Tokyo Musashino's junior youth setup. A product of Japan's youth development system, Satake forged an independent path, establishing his own successful football program at an unheralded school team. His coaching philosophy champions aggressive, high-risk strategies, specifically a "super high press" designed to disrupt opponents. He advocates this approach for younger players, believing it maximizes pressure and creates scoring chances, requiring deep player trust to foster the courage for calculated risks. Satake exhibits tactical flexibility, notably granting Akinori Kaneda significant individual freedom as a "free agent" or "wild card" within the team structure. While Musashino operates cohesively, Kaneda is permitted deviations, especially during counterattacks. Satake tolerates this due to Kaneda's scoring output, demonstrating pragmatism prioritizing on-field results over rigid conformity. His mentorship extends beyond tactics. During a scouting trip involving Ashito Aoi, Sōichirō Tachibana, and Eisaku Ohtomo, Satake greets Tachibana warmly. Learning Tachibana requested exclusion from an upcoming Musashino match due to internal conflict, Satake offers a defining principle: struggling signifies choosing the correct path. This reflects his belief that genuine growth arises from confronting challenges directly. The character has been adapted beyond the original manga into stage productions, maintaining his role as Tokyo Musashino head coach.