Kanon Nakagawa is a popular high school idol acclaimed for her musical talent and signature appearance, defined by glasses, hair ribbons, and antenna-like hair strands. She initially faced tone-deafness but conquered it through rigorous vocal training to attain idol status. Her career revolves around live performances and starring in her own magical girl television series.

During auditions for a sister role in her show, a runaway spirit transformed her into a younger self. This incident halted her professional engagements temporarily. In this altered state, she discovered runaway spirits and surrounding supernatural conflicts, marking her first direct exposure to this hidden world. The experience challenged her grasp of reality, though elements remained perplexing.

Beyond her public image, she serves as a vessel for the goddess Apollo. Unlike typical vessels who lose awareness during divine activity, she maintains partial consciousness alongside Apollo. This creates a distinct shared presence, intertwining her human life with supernatural obligations as Apollo's vessel.

Her background includes intense personal struggle to master singing, where perseverance against vocal limitations forged her path to success. The audition incident—involving Elsie's attempt to secure the sister role—exposed her to wider supernatural events she navigates in her goddess-connected role. Her development reflects an ongoing convergence of human ambitions and divine responsibilities.