Iori Ayase is a tomboyish young woman who works at a café and harbors a deep insecurity about her small chest. She has a quiet crush on Sota Seto, the café’s handsome and graceful pastry chef, but assumes he would never be interested in someone like her. Her assumption shatters when Sota suddenly confesses his love for her and kisses her without warning. The first time she sees him unclothed, she is shocked by his well-endowed physique, and she soon finds herself exploring an intensely physical relationship with him—one that is both embarrassing and eye-opening as she realizes that intimacy with him is far from unpleasant.

Set in the everyday environment of the café and later in shared living spaces, the story blends romance, comedy, and erotic drama. As Iori and Sota navigate their new relationship, they confront their own personal insecurities: Iori’s lingering self-doubt about her flat chest and tomboyish nature, and Sota’s own hidden vulnerabilities. The narrative develops through a series of episodic arcs in which new characters—often strangers or people from their past—enter the picture and develop romantic interests in Iori, repeatedly testing the couple’s bond. This recurring pattern of external threats adds drama and tension, while the core of the story remains the couple’s growing emotional and physical intimacy. Over time, they move in together and work through conflicts, learning to trust each other and accept themselves. The series concludes with their relationship firmly established, having weathered jealousy, misunderstandings, and personal growth.