Nagisa Aoi transfers to St. Miator Girl's Academy and gets acquainted with the school and fellow students, including Tamao Suzumi, her friendly (if somewhat overbearing) roommate, Miyuki Rokujou, the Miator student council president, and Shizuma Hanazono, the Etoile, whom Nagisa finds beautiful and intriguing but also frustrating and perplexing due to her forwardness in her advances.