"Glass Mask" centers on Kitajima Maya, a young girl with an extraordinary talent for acting, who dreams of becoming a renowned stage performer. The series explores her journey as she navigates the competitive world of theater, facing numerous challenges and rivalries. Maya’s raw passion and ability to immerse herself completely into her roles set her apart, catching the attention of Tsukikage Chigusa, a legendary but reclusive actress who becomes her mentor. Under Chigusa’s guidance, Maya begins to hone her craft, though the path is fraught with obstacles, including her rival, Himekawa Ayumi, a polished and privileged actress who views Maya as a threat.

The narrative is driven by Maya’s pursuit of the lead role in "The Crimson Goddess," a legendary play that has never been fully performed due to its demanding nature. The role becomes a symbol of ultimate achievement in the acting world, and both Maya and Ayumi vie for the opportunity to portray it. The series delves into the intense training, emotional struggles, and personal sacrifices required to excel in the performing arts, as well as the complex relationships between the characters. Maya’s unwavering determination and ability to channel her emotions into her performances form the core of her growth, while Ayumi’s calculated approach and privileged background create a compelling contrast.

Supporting characters, such as Hayami Masumi, a wealthy and influential figure in the theater world, and Sakurakouji Yuu, a kind-hearted childhood friend, add depth to the story. Masumi’s interest in Maya’s potential and his role as a benefactor create tension, while Yuu’s unwavering support provides a grounding presence in Maya’s life. The series balances Maya’s professional aspirations with her personal relationships, offering a multifaceted portrayal of her journey. Themes of perseverance, rivalry, and the transformative power of art are woven throughout, making "Glass Mask" a compelling exploration of ambition and self-discovery in the world of theater.