Inoue Akane, a former track and field senior at Tomoka Kase’s high school and later her university peer, shares a history shaped by athletic camaraderie. Rumors initially cast her as a romantic rival to Yui Yamada, though this assumption dissolves as their true dynamic emerges. Teammates once urged Inoue to race Kase despite her slower pace, but Kase defied expectations by dedicating herself to coaching Inoue, forging a bond rooted in respect.

During a high school cultural festival, Inoue discreetly evaluates Yamada’s suitability for Kase, probing her character through subtle interactions. Satisfied with Yamada’s sincerity, she grants her approval, solidifying her role as a discerning ally. At university, Inoue remains invested in Kase’s athletic journey, advocating for her untapped potential as a runner.

Her mentorship blends competitive drive with genuine care, prioritizing Kase’s growth both on and off the track. Though initially cautious of Yamada, Inoue transitions into recognizing the strength of their connection, balancing guardian-like support for Kase’s aspirations with respect for her personal choices. Her ponytail and athletic frame reflect a lifelong dedication to the sport that continues to shape her relationships.