After a missed connection years ago, office worker Mizuho developed an irresistible craving for deep, sultry voices. With this unique fixation, she has been searching for that perfect tone to satisfy her desires. When she meets Hibino, a handsome salesman with a voice as smooth as velvet, at a company drinking party, Mizuho is instantly captivated. She invites him back to her place, where just a single suggestive whisper sends her senses into overdrive.

The story follows Mizuho, a woman whose aural fixation dictates her romantic pursuits, and Hibino, a confident yet genuinely interested salesman who finds her reaction to his voice both bemusing and endearing. What Mizuho expects to be a single passion-filled night turns into something more when Hibino expresses a desire for a serious, exclusive relationship. The two begin dating in earnest while agreeing to keep their romance under wraps at the office. As they grow closer, they discover a deep compatibility both in and out of the bedroom.

The manga is set primarily in contemporary urban Japan, moving between their workplace, a typical corporate environment, and the private spaces of their apartments where their physical relationship unfolds. The narrative is driven more by sensual experience than complex plot, with a heavy emphasis on the chemistry between the two leads.

Notable narrative arcs include the initial hookup and Hibino's unexpected request for a committed relationship. A significant development occurs when Mizuho encounters other men with similarly attractive voices, which brings out a jealous and more intensely tempting side of Hibino, testing the strength of their connection. The series follows their attempts to navigate a serious relationship that began as a purely physical encounter, exploring whether their bond can deepen beyond its erotic foundation.