"RIN backstage" is a manga series that delves into the world of theater and the personal struggles of its protagonist, Rin, a young woman with a passion for acting. The narrative centers around Rin's journey as she navigates the competitive and often cutthroat environment of the performing arts. Rin, who initially lacks confidence and experience, joins a small theater troupe where she begins to hone her craft. The series explores her growth as an actress, her relationships with fellow troupe members, and the challenges she faces both on and off the stage.

The plot is driven by Rin's determination to prove herself in the theater world, despite her insecurities and the obstacles she encounters. Key characters include the troupe's director, who serves as a mentor figure, and other actors who each have their own ambitions and struggles. The dynamics within the troupe are complex, with rivalries, friendships, and romantic tensions adding depth to the story. As Rin becomes more involved in the troupe's productions, she begins to uncover her own potential and the true meaning of dedication to her art.

The series also addresses broader themes such as the sacrifices required to pursue a career in the arts, the importance of collaboration, and the impact of personal relationships on professional growth. Rin's journey is marked by moments of triumph and setbacks, reflecting the unpredictable nature of the theater industry. Through her experiences, the manga provides a realistic portrayal of the challenges faced by aspiring actors and the resilience needed to succeed in a demanding field.