Naoko Saionji heads the talent agency managing the idol group Mr. Doctor. She possesses distinctive lavender hair and gold eyes, dressed in a signature style featuring a black hat with a white bow, green and gold gemmed earrings, a matching necklace, a lilac throw-over, a violet dress, and red shoes. Her professional conduct is marked by manipulation and control, particularly targeting former member Yu Arimura after his departure for horse racing. Following Arimura's injury, Saionji resorts to intimidation, threatening to release a documentary filmed without his full consent to pressure his return, exposing exploitative industry practices. This covertly recorded documentary, initiated by Tako Kitami upon Arimura's enrollment at the racing academy, serves as a tool to sway public opinion against his career change. Later, Saionji publicly fires Arimura during a mini-concert at the horse racing school, an action forcing her agency to absorb contractual penalties. Her motivations focus on maintaining control over the idol group's public image and safeguarding its commercial interests.