Rinne serves as a Guardswoman, renowned for her high intellect and consistently level-headed composure even amidst chaos. She has long brownish blond hair and wields a white guitar as her Prism Live Instrument, distinguished by a star at the end of its handle. Her combat abilities include performing multiple consecutive Prism Jumps, initially achieving four when others could not, later evolving to five jumps in Episode 39 and six during a duo performance in Episode 43. A notable personal trait is her fondness for hot milk, which consistently brings a happy smile to her face.

She combats threats in a post-apocalyptic Tokyo where human males are extinct and humanity faces eradication. Rinne participates in missions addressing bioterrorism and other dangers alongside fellow Guardswomen, employing logic and composure during operations. Her designated "My Song," titled "Gift," debuted during her first solo Prism Live in Episode 9. In Episode 39, she formed the unit "Sevendays Love, Sevendays Friend" with Juné to compete in the duo-exclusive Winter White Session.

Rinne's narrative concludes in Episode 50 when she gains the Grand Rainbow Crown and returns to the Prism World. Upon returning, she loses all memories of her experiences and companions in the human world, as dictated by Prism World rules. However, she retains the phrase "Happy Naru!", explaining to Starn that she encountered it in a world where she once spread the Prism's Sparkle.