Rio, orphaned in childhood, endured profound loneliness that forged a deep fear of abandonment and connection. To shield himself, he sharpened a cold, sarcastic exterior, wielding criticism and distance as armor. He possesses a naturally beautiful singing voice and exceptional musical talent, forming one half of the wildly popular idol unit LIP×LIP alongside Yuujiro Someya. Despite their success, Rio maintains emotional detachment, viewing idol activities primarily as a job. He frequently clashes with Yuujiro due to their differing personalities and approaches, creating friction. Perceptively observant, Rio often notices subtle details about others, including their unit manager Hiyori Suzumi, whom he initially greets with skepticism and sharp remarks, testing her resolve. Rio's journey centers on confronting his fear of vulnerability. Hiding his true feelings – his passion for music and complex bond with Yuujiro – becomes unsustainable. Key events, including conflicts within LIP×LIP and interactions with Hiyori, compel him to gradually lower his defenses. He begins acknowledging his reliance on Yuujiro as his partner and the unit's significance beyond professional success. He starts expressing genuine emotions more openly, particularly his deep care for music and evolving appreciation for Hiyori's unwavering support and straightforward nature. While retaining his sharp tongue, his interactions become less overtly hostile, layered with underlying concern and growing trust. By the series' conclusion, Rio demonstrates a stronger commitment to LIP×LIP, a willingness to be emotionally present for Yuujiro and Hiyori, and greater acceptance of his own need for connection. His journey signifies embracing vulnerability and the connections he once guarded against.