Rin Shibuya, a 15-year-old student and idol under 346 Production, first presents a cool, aloof demeanor. Sleek black hair and a sharp school uniform contribute to an unfriendly, hard-to-approach impression – a trait she self-consciously recognizes. Beneath this exterior lies a fundamentally honest and hardworking personality, revealing a more open and friendly side once trust is established. Her introduction to the CINDERELLA PROJECT begins with reluctance; she flatly rejects the Producer's scouting offer due to disinterest in becoming an idol, though she later agrees to join. Her background involves living and assisting at her parents' flower shop, grounding her in a family-oriented environment that contrasts with her trendy, imposing image. Joining alongside Uzuki Shimamura and Mio Honda, Rin becomes a founding member of the main unit "New Generations," frequently featured together in promotional materials and storylines. Early project activities expose her nervousness during publicity shoots and the immense pressure of serving as backup dancer for top idol Mika Jougasaki. These challenges strain the trio, causing moments where their rehearsals falter. A pivotal development occurs when Mio temporarily departs the project. Rin also chooses to leave, citing growing distrust in the Producer's ability to support and communicate effectively, stemming from the Producer's failure to proactively address Mio's concerns. Her return, facilitated by the Producer's renewed resolve and Uzuki's dedication, marks a shift toward greater commitment and team reliance. Subsequent interactions reveal gradual softening; she expresses gratitude to the Producer, acknowledges her own difficulty displaying emotion openly, and affirms her dedication to improvement. As "New Generations" debuts, undertaking PR video filming and mini-concerts, Rin's role solidifies. Her evolving quotes show increased concern for the Producer's well-being, offering tea and expressing hope audiences enjoy their performances. Training and live events hone her confidence, leading to assertive leadership remarks like "Let's go, everybody!" during group activities. While maintaining a reserved aura, moments of genuine enthusiasm emerge – bright smiles during performances or appreciation for new outfits. Her involvement extends beyond her unit to summer festivals and idol training camps alongside other project members, facing coordination challenges. These events, coupled with large-scale performance stress, test her resilience. Though not always central to every incident, her presence remains consistent within the ensemble navigating organizational changes and high-stakes events like the "Cinderella's Ball: Power of Smile" project. Affectionately nicknamed "Shiburin" by fans and fellow idol Mio Honda, Rin shares close bonds with Uzuki and Mio. This trio, frequently depicted together in promotional media, underscores her journey from a distant individual to a collaborative idol invested in collective success.