The manga follows Suzuzuki Mai, a young woman who works as a temporary office lady (OL) while secretly earning money as a voice actress for adult games. Her motivation for entering this line of work is not financial desperation but a particular fascination: she finds it intensely interesting how her voice alone can sexually arouse men. She takes genuine pleasure and pride in this power.

Mai's professional life is anchored by her supervisor, a department manager named Honjou. To her, he is the embodiment of an unflappable and stoic man, a "iron mask" who never shows any emotion or vulnerability. This inaccessibility makes him her ultimate challenge; she dreams of seeing such a rigid, controlled man lose himself to desire because of her voice. However, despite her attempts to provoke him, his expression never changes, which begins to shake her confidence both as a woman and as a voice actress.

The plot is set in motion when a chance event leads the two to begin a secret romantic relationship. To Mai's shock, the cold and aloof Honjou reveals a hidden side of himself. Despite his reserved manner of speaking, he is intensely passionate and skilled during their intimate encounters. The central conflict arises from the double life Mai leads. The relationship forces her to constantly navigate the risk of her respectable office job and her secret, socially stigmatized side career colliding. The core tension is whether Honjou will discover what she does for a living and how he would react if he found out.

A notable early arc involves Mai's attempts to provoke Honjou at work, which she frames as playful teasing but is rooted in her professional curiosity. This backfires when he remains unmoved, leading to her personal and professional insecurity. The story then shifts to the discovery of their mutual attraction, leading to the establishment of their secret office romance. The ongoing narrative focuses on the contrast between Honjou's cold professional persona and his passionate private behavior, all while the threat of Mai's secret being exposed hangs over their relationship. Her background as an adult game voice actress also informs their physical relationship, as she brings a unique theoretical knowledge to her first real experiences, which are with Honjou.