"Heroine for Hire" centers on the life of Aoi, a young woman who works for a unique service agency that provides heroines for various real-life scenarios. Clients hire these heroines to fulfill roles such as fake girlfriends, emotional support, or even stand-ins for social events. Aoi, the protagonist, is highly skilled at her job, adept at adapting to different personas and situations to meet her clients' needs. Her professionalism and ability to empathize with others make her a standout employee, but her personal life remains largely detached and unfulfilled.

The narrative explores Aoi's interactions with her clients, each of whom has distinct reasons for seeking her services. These encounters range from lighthearted and comedic to deeply emotional, revealing the complexities of human relationships and the loneliness that often drives people to seek such unconventional solutions. Through her work, Aoi begins to confront her own unresolved feelings and insecurities, particularly her fear of genuine emotional connection.

Key characters include Aoi's colleagues, who each bring their own quirks and perspectives to the agency, and recurring clients whose stories intertwine with Aoi's growth. The series delves into themes of identity, authenticity, and the blurred lines between professional roles and personal emotions. As Aoi navigates her dual life, the story examines the impact of her work on her sense of self and her ability to form meaningful relationships outside of her job. The plot balances episodic client-focused arcs with an overarching narrative about Aoi's journey toward self-discovery and emotional vulnerability.