Ayame Reikadou holds the fourth rank in her high school's popularity hierarchy as a member of the "Popular Five." She possesses distinctive blonde hair featuring two long bangs framing her face and striking golden eyes. Her figure includes large breasts, later revealed as silicone implants from plastic surgery—a secret she fiercely guards to avoid social rejection. She wears the standard school girl uniform complemented by a small deep red hat adorned with a bow on its right side.

Ayame projects a consistently cold, haughty, and dominant personality, fueling her appeal among masochistic male students. This arrogant demeanor is a deliberate facade crafted to attract a childhood friend known to favor tsundere personalities. Despite her outward confidence, she harbors deep vulnerability about her breast augmentation and fears exposure. Her sharp tongue frequently targets those with smaller busts, yet she displays unexpected emotional openness when pressured.

Her persona and physical alterations stem directly from this childhood friend's preferences: his attraction to tsundere archetypes shaped her harsh attitude, while his liking for large-breasted women motivated her surgery, reflecting her profound desire for his acceptance. The friend's identity and their current relationship remain undefined.

Key relationships define her interactions. She maintains open hostility toward Kanade Amakusa after he accidentally uncovers her surgical secret through an "Absolute Choice" event. Forced to ensure his silence, she enters an embarrassing bargain involving fake declarations of affection, creating mutual annoyance despite his promise to keep her secret. Her most significant rivalry is with Furano Yukihira of the "Reject Five." Ayame relentlessly mocks Furano's flat chest, sparking constant arguments. This dynamic shifts when Furano discovers Ayame's secret during a competition but chooses concealment. This act creates a complex debt, leading Ayame to privately acknowledge some understanding of Furano's breast-related insecurities.

Within the narrative, Ayame debuts during a meeting between the Popular Five and Reject Five, igniting conflict by taunting Furano's chest. Kanade's third mission under the Absolute Choice curse forces her surgical secret into public view before him. This compels a private confrontation and coerced confession. She later faces Furano in a "nickname battle"; though Furano learns her secret mid-contest, Ayame wins by crafting the most effective insult. Her popularity rank eventually drops when Satsuki Himajiri claims the fifth position.