"Cosplay Roshutsu Kenkyūkai" is a short-form anime series that explores the lives of three university students who form a unique club dedicated to the study and practice of cosplay. The narrative centers on Haruka, a reserved and introverted girl who harbors a secret passion for cosplay. Despite her shyness, she is drawn to the world of costumes and character portrayal, though she struggles to share this interest with others. Her life takes a turn when she encounters two classmates, Mayu and Saya, who share her enthusiasm for cosplay.

Mayu, a confident and outgoing individual, is the driving force behind the formation of the Cosplay Exposure Research Society. She is unapologetically passionate about cosplay and encourages Haruka to embrace her interests openly. Saya, on the other hand, is a more pragmatic and level-headed character who provides a balance to Mayu's exuberance. Together, the trio navigates the challenges of balancing their academic responsibilities with their shared hobby, often finding themselves in humorous and lighthearted situations as they explore the intricacies of cosplay culture.

The series delves into the process of creating costumes, attending events, and the social dynamics within the cosplay community. Each episode highlights the characters' growth as they confront their insecurities, build friendships, and learn to express themselves through their craft. The narrative also touches on themes of self-acceptance, creativity, and the importance of finding like-minded individuals who share one's passions. While the tone is predominantly comedic, there are moments of introspection that add depth to the characters' journeys.

The anime's episodic structure allows for a focus on different aspects of cosplay, from the technical challenges of costume-making to the emotional highs and lows of participating in events. The interactions between Haruka, Mayu, and Saya form the core of the story, with their contrasting personalities creating a dynamic and engaging dynamic. Through their experiences, the series offers a glimpse into the dedication and artistry involved in cosplay, as well as the sense of community it fosters.