Eiji Akagi, second son of legendary boxer Keijiro Akagi and brother to another boxing aspirant, rebelled against his family's sport during his youth. He became a high school dropout, channeling his energy into playing rock guitar despite being notoriously inept. His early life was characterized by aimless rebellion and distancing from his family's legacy.

A pivotal shift occurred when Eiji met the younger sister of local boxing champion Daigo Nogi. This encounter sparked an abrupt, unexpected interest in boxing, spurred by romantic attraction and the desire to impress her. Prompted by this new motivation, he began training under Daigo Nogi's guidance, reversing his previous aversion to the sport.

Eiji's personality blends brash impulsiveness with underlying determination, evident when he physically confronted audience members after being struck during a performance. While his initial boxing pursuit was fueled by romance, his commitment to training became apparent. The complex dynamics with his father and brother continued to influence his conflicted feelings towards boxing and his identity. His development traces a path from apathy to engagement, though his boxing journey and romantic pursuits remain ongoing.