Mei Yoneme, a first-year student at Yuigaoka Girls’ High School, enrolls with the intent to discreetly observe the school idol group Liella! as an ardent fan. Her naturally sharp gaze, mistaken for "scary eyes" due to uncorrected vision, unintentionally casts her as a delinquent in others’ eyes—a stark contrast to her introverted, timid nature. This self-consciousness fuels her reluctance to pursue idol activities despite her fervent admiration, convinced her intimidating appearance clashes with the idol image. Her blunt speech and guarded demeanor around strangers amplify this perception, yet she nurtures a hidden devotion to school idols, shared exclusively with childhood friend Shiki Wakana, their bond unbroken since middle school.

Evolving into a second-generation Liella! member and CatChu! subunit participant, Mei adopts rouge as her signature hue. Her journey from sarcastic reticence to composed, emotive performances signals profound personal growth. This transformation peaks with her ascension to School Idol Club president after Chisato Arashi’s graduation, symbolizing her newfound confidence and leadership.

Sporting red hair in a side bun, blue eyes, and a 155 cm slender frame, Mei distinguishes herself by discarding her uniform’s ribbon—a subtle rebellion. Her interests span collecting feline-themed trinkets, binge-watching cat videos, and piano practice, while blueberries, soufflés, and parfaits top her culinary preferences. Academically, she thrives in physical education, particularly running.

Beneath her tsundere exterior—prone to flustered denials when labeled “cute”—lies a principled integrity and quiet empathy. Her trajectory from self-doubt to embracing leadership and idolhood underscores resilience, balancing earnest dedication with a tenderhearted core.