Kuroiwa, a high-powered career woman who finds no joy in romance, is approached at a bar by Mashiro, a woman who’s her complete opposite, and they end up spending the night together. Thinking it was a one-night mistake, Kuroiwa then discovers that Mashiro is actually a junior at her company, and Mashiro even confesses that she likes Kuroiwa...!? Undeterred by workplace boundaries, the romance-obsessed junior Mashiro pursues her relentlessly, and Kuroiwa is gradually won over.