Akane Nanamiya is a high school student living in a school dormitory. She possesses striking red hair styled in waist-length twin tails with spiky bangs and blue, tareme-shaped eyes. Standing 157 cm tall, she has a slim, pale physique with body measurements of 86-57-84 cm and an E-cup bust size. As a member of the softball club, she frequently carries a baseball bat, utilizing it not only for sports but also to punish Kazuya for his inappropriate behavior, showcasing her volatile temper and explosive reactions toward him. Despite this outwardly aggressive and cold-hearted demeanor, particularly directed at Kazuya, her personality is complex, revealing emotional, jealous, kind, naive, and shy traits, often manifesting as tsundere behavior in interactions.

Sharing the same dormitory as Kazuya leads to frequent confrontations stemming from her open disgust for his perverse actions. However, she gradually develops romantic feelings for him, becoming increasingly embarrassed and unable to meet his gaze. Her hobbies include reading romance novels, and she excels at housework, with cooking noted as a special talent. Her friends are Mai, Chihiro, and Misha, and she belongs to Kaoru's group of friends. Riri Asai, a member of the swimming club, is in love with her, causing Riri's heart to race in her presence. Akane's favorite phrase is "You must fly to Uranus!!".