Minami Asakura, childhood friend and neighbor to the Uesugi twins Tatsuya and Kazuya, assists her widowed father at their family-run Minami Kaze coffee shop after her mother's passing, balancing this responsibility with academics and athletics. During high school, she supports Kazuya's baseball ambitions as team manager while simultaneously building her own athletic career in rhythmic gymnastics, achieving significant success including international recognition.

Three years post-original series events, she attends college separately from Tatsuya. Despite her thriving gymnastics career, Minami experiences deep unhappiness and emotional strain due to the growing distance in her relationship with Tatsuya. This period involves intense personal conflict, heightened by jealousy when fellow student Kaori Mizuno creates a false impression of romance with Tatsuya. In a moment of vulnerability stemming from loneliness and uncertainty about Tatsuya's feelings, Minami briefly accepts courtship from Akio Nitta—Tatsuya's former baseball rival. She ultimately rejects Nitta, explicitly stating her inability to reciprocate his feelings, asking him to "save her" from the situation, and reaffirming her enduring love for Tatsuya.

Her development culminates in two pivotal decisions: abandoning her accomplished gymnastics career to pursue a new, unspecified dream, and reconciling with Tatsuya after he resolves to return to baseball. Though Tatsuya subsequently departs for a professional baseball career in the United States, Minami accepts this separation, committing to their relationship despite physical distance.

Her journey remains centrally defined by her relationship with Tatsuya, marked throughout by loyalty, patience, and emotional resilience amid misunderstandings and external pressures.