Miu Midō is a popular professional model working for Star Productions, a prominent talent agency. She comes from a wealthy and influential family, as she is a member of the Midō family and her father serves as the president of one of Japan's largest corporations. Despite her high social standing, Miu maintains a professional, humble, and warm demeanor, treating fans and colleagues with kindness. She is characterized by her poise, dedication to her craft, and genuine nature.

Her role in the story begins when she is paired with the protagonist, Yūya Tenjō, for a photoshoot. Her originally assigned partner, Shō, fails to appear on time due to negligence and is subsequently fired by the manager. Yūya steps in as a replacement, and Miu is impressed by his unexpected talent and kind personality. The situation becomes more significant when Shō later confronts Miu and attempts to harass her. Yūya intervenes and subdues Shō, saving Miu from the unwanted advance. This act of rescue deeply affects Miu, and she begins to develop romantic feelings for Yūya. She becomes willing to do anything for him and expresses a strong desire to be accepted as a model for Star Productions under his influence.

Miu serves as a supporting character in the series, representing a connection to the real world that is impacted by Yūya's transformation. Her growing affection for him adds to the interpersonal dynamics of the story, and she occasionally visits his home to spend time with him. She does not possess any supernatural or combat abilities, as her significance lies in her professional life and her relationship with Yūya. Visually, she has chest-length brown hair and brown eyes, and her appearance reflects the polished elegance expected of a fashion model. Her background as a wealthy heiress contrasts with Yūya's humble beginnings, but her character is defined more by her earnestness and loyalty than by her status.