Akane Asahina is the class representative, a role that imbues her with a strong sense of duty and a strict adherence to school regulations. This position fuels her vocal disapproval of the public and intense romantic relationship between Chizuru Minamoto and Kouta Oyamada, which she deems inappropriate conduct.

She maintains a concerned, positive relationship with Kouta, frequently cautioning him against Chizuru’s influence, which she perceives as negative. This vigilance appears to stem from both her principled nature and a possible personal jealousy of Chizuru’s physical confidence.

Her interactions with Tayura Minamoto, Chizuru’s brother, are initially cold. She is dismissive of his advances and often responds to his attempts at intimacy with physical rebuffs. Their dynamic shifts after he risks his life to save her from the ocean, an event that leads her to warm towards him significantly. Despite this thaw, she continues to react with physical force whenever he oversteps her boundaries.

A defining trait is her severe alcohol intolerance; a single sip of sweet wine, or amazake, is enough to render her intoxicated.

She is consistently shown wearing the standard school uniform and glasses. Descriptions of her physical appearance vary, with some sources noting gray eyes and gray hair, and others describing black hair and green eyes.