Utae Sonokoe (園声 謡江) is a student in class 1-2 at Inspiration Academy Private High School, an institution specializing in exceptional talents. Recognized internationally as a "genius" pop idol, she holds significant fame both within the school and beyond. Her public image presents a cheerful, sociable, and polite demeanor, devoid of star-related arrogance, contributing to immense popularity across a diverse fanbase spanning genders and ages.

Beneath this stage presence projecting purity and approachability through angelic vocals, she experiences profound internal conflict. A discrepancy between her public persona and private self fuels an identity crisis. She questions whether her actions reflect her true desires and worries about deceiving her fans, manifesting a darker, complex psychological state under her happy facade.

Personally, she openly engages with reading erotic novels written by her classmate Taketo Akutagawa, viewing such material as a normal aspect of human expression without judgment. This acceptance of unconventional creativity contrasts with her innocent public image. Her appreciation for Taketo's work and her perception of him as a sympathetic individual who accepts her true self lead to romantic feelings. However, her demanding idol schedule significantly limits opportunities for interaction with him.

She navigates the tension between societal expectations of innocence tied to her idol role and her private engagement with mature themes, embodying a duality that challenges conventional norms. This duality extends to her artistic identity, balancing public performances with personal creative impulses, reflecting a continuous negotiation between external perceptions and internal authenticity.