Yasumi Utatane is the professional stage name of high school student Yumiko Satō, who works as a voice actress. Her real identity, Yumiko, embraces a gyaru fashion style with flashy jewelry and loose clothing, creating a stark contrast with her meticulously crafted public persona. This duality arises from her need to project purity and innocence for her fans, concealing her true self to meet industry expectations. Raised by her mother and grandmother after her father's death in childhood, Yumiko's life grows complicated upon discovering her reserved classmate, Chika Watanabe, is also a voice actress using the stage name Yuhi Yugure. Their initial interactions are hostile, marked by mutual disdain following a classroom argument.

This tension escalates when they are paired to co-host a high school-themed radio program, forcing professional collaboration despite their off-air animosity. During recordings, they project friendship and compatibility, but their relationship deteriorates into frequent arguments once microphones are off, creating a situation where exposure of their real conflicts could jeopardize their careers. Their partnership extends to joint projects including anime productions and live events. Yumiko secures a semi-leading role in a television anime, slated to form a musical unit with the main cast and perform the opening theme song, introducing additional pressures testing their working relationship. As they encounter industry obstacles like intrusive fans, public scrutiny, and the emotional toll of dual identities, they gradually develop a grudging respect for each other's dedication and talent.

An outing to a butcher shop, prompted by a promise from their radio show, sparks unexpected revelations about each other's lives, breaking down prejudices and fostering tentative understanding. Through repeated collaborations and shared experiences overcoming professional hurdles, their rivalry evolves into mutual reliance and a deepening emotional connection. They begin challenging each other's approaches to voice acting, influencing personal growth and career aspirations. Yumiko's journey involves reconciling her public and private selves, moving toward greater authenticity. Her evolving dynamic with Chika acts as a catalyst, helping her confront industry pressures while gradually shedding the performative aspects of her idol persona, underscoring a narrative about identity and professionalism in the voice acting industry.