Anju Yūki is a third-year student at UTX High School and a member of the elite school idol group A-RISE, performing alongside her group mates Tsubasa Kira and Erena Tōdō. She has long, curly orange hair with straight bangs and purple eyes, and carries herself with a calm, composed, princess-like demeanor. Her voice is sweet, and she remains unbothered by competition, handling interactions with fans and even rival groups with grace. A-RISE is highly popular and serves as an inspiration and benchmark for other school idol groups, including μ's. Initially appearing as rivals, A-RISE eventually shows respect for μ's, offering them access to UTX High School’s rooftop stage for a crucial performance. Anju graduates during the anime series but continues with A-RISE into the movie’s timeframe. She collaborates with Kotori Minami on costume design for a large-scale school idol festival organized by μ's, and she attends μ's final performance alongside her A-RISE teammates.