Goa is a supporting character known for his role as a talented and dedicated screenwriter in the theater industry. He is a young man with medium-length brown hair that reaches his neck, purple eyes, and a small mole underneath his right eye. His fashion sense is notable, as he is often seen wearing various stylish clothes, frequently accessorized with a scarf and earrings.

Goa is portrayed as a calm, well-mannered, and professional individual who is deeply knowledgeable about the world of theater and screenwriting. His reputation is that of a famous and immensely skilled writer, particularly in the realm of adapting existing works into stage productions. He possesses a practical understanding of what can and cannot be realistically adapted from one medium to another, ensuring his scripts are functional for live performance. Beyond his technical skill, Goa is driven by a genuine passion for his craft. According to the producer Sumiaki Raida, Goa loves theater from the bottom of his heart, and every play he writes leaves audiences smiling. Despite acknowledging the many difficulties of being a screenwriter, such as being easily replaceable or facing criticism from both authors and audiences, he continues to work hard and finds success in his field, indicating he truly enjoys his job. He also demonstrates a strong work ethic by taking the time to read and become a fan of the original source material, such as the Tokyo Blade manga, before starting an adaptation.

In the story, Goa is introduced as the sole screenwriter hired to adapt the popular manga Tokyo Blade into a 2.5D stage play. His central role in the narrative revolves around the creative conflict that arises from this project. The original manga author, Abiko Samejima, is deeply displeased with the adjustments Goa made to her story for the stage, to the point where she demands his removal from the production. This puts Goa in a difficult position, especially because he is a big fan of Abiko's work.

A significant part of Goa's character arc involves his relationship with Abiko Samejima. Initially, their relationship is hostile due to her anger over his script. However, through the mediation of figures like Aqua Hoshino, the communication breakdown between them is resolved. Following advice from her mentor, Abiko agrees to collaborate directly with Goa. Together, they work closely to rewrite the script. Despite a rocky start, they find their artistic visions are surprisingly compatible. Their collaboration becomes intense and passionate, with the two of them working late into the night. The final script they produce is described as outrageous and demanding, relying less on dialogue and more on the actors' emotional and physical performances, but it is one that ultimately satisfies Abiko. By the end of the arc, their relationship has improved significantly, with Abiko showing signs of social anxiety around Goa, which her mentor interprets as a positive sign of her being happy to engage with him.

Goa also maintains a strong professional relationship with producer Sumiaki Raida. They have collaborated on multiple stage productions, including Tokyo Blade and another play called Smash Heaven. Raida holds Goa in high regard, praising his patience during the script revision process and his deep love for the theater. A notable ability of Goa is his skill in creating innovative and technically advanced stage directions, effectively using modern stage equipment and devices to create dynamic and spectacular productions. This talent, combined with his collaborative spirit and passion, defines his contribution to the story.