Ginji Kubo serves as a central figure in the narrative, distinguished by a signature eyepatch resulting from a significant injury. Introduced as a delinquent youth, he forges a pivotal partnership with Mankichi Togawa, becoming one of his earliest and most steadfast followers. His allegiance begins when he joins Mankichi’s quest to dominate delinquent groups, positioning himself as a loyal subordinate who confronts rivals and bolsters Mankichi’s leadership.

Ginji’s background includes an orphanage and a juvenile rehabilitation facility—harsh, prison-like environments that forged his resilience and shaped his role in group dynamics. As Mankichi’s influence expands, Ginji evolves from a solitary delinquent into a key figure within the growing gang, mobilizing and organizing members into a structured, army-like force. His responsibilities extend beyond combat to recruiting allies, mediating internal conflicts, and reinforcing cohesion during discord or external threats.

Interpersonal relationships further define Ginji’s arc. He navigates a complex dynamic with Tomoko, Mankichi’s romantic interest, managing tensions from her presence in gang activities. This intensifies during Mankichi’s temporary involvement with Ayumi, where Ginji steadfastly demonstrates loyalty while handling shifting group allegiances. His commitment faces tests in critical moments, including sacrifices by former adversaries-turned-allies for Mankichi’s safety, reinforcing loyalty and loss in Ginji’s experiences.

Throughout the narrative, Ginji remains instrumental in the group’s physical expansion and the emotional fortification of its members. His journey reflects a transition from individual defiance to collective responsibility, embodying the story’s central themes of camaraderie and perseverance.