Rina Tennōji, a first-year Nijigasaki High School student and member of the school’s Idol Club subunit QU4RTZ, navigates social interactions using her "Rina-chan Board"—a sketchbook or digital screen where she sketches emotive faces to convey feelings her neutral expression cannot. This tool, central to her daily life and performances, stems from her fear of appearing distant due to her unchanging demeanor. Technologically gifted, Rina thrives in science and mathematics but finds Japanese classes challenging. Her passions include coding apps, piloting quadcopters, gaming, and tinkering with gadgets, exemplified by her robotic pet cat Aran. She channels creativity into designing expressive board illustrations and a self-made fortune-telling app, blending innovation with personal expression. Invited to the idol club by Ayumu Uehara and Ai Miyashita, Rina hesitantly steps into the spotlight, initially doubting her fit for idolhood. Gradually, she embraces the role to forge connections, inspired by Ai’s outgoing confidence and bonding with Mia Taylor over shared club experiences. Her resolve to minimize reliance on the Rina-chan Board grows, driven by a desire to communicate authentically. She eyes future handshake events with nervous anticipation, determined to manage without her board and someday unveil a genuine, unmediated smile. In *Love Live! School Idol Festival All Stars*, her storyline traces this evolution from uncertainty to committed idol, balancing tech-driven creativity with interpersonal growth. Periodic high rankings in monthly polls mirror her rising confidence and peer acceptance. Visually distinct with pink shoulder-length hair, yellow eyes, and a petite frame, Rina accessorizes with a cat-ear headband and striped socks. The ever-present "Auto Emotion Convert Rina-chan Board" symbolizes her inventive approach to bridging communication gaps while maintaining her identity as an idol who turns vulnerability into artistic strength.