Rin Hoshizora, a spirited first-year student at Otonokizaka High School, forms half of a dynamic childhood duo with the introverted Hanayo Koizumi. Her athleticism and boisterous energy contrast Hanayo’s shyness, yet their bond anchors her journey. Lingering insecurities from childhood mockery over skirts fuel Rin’s aversion to femininity, initially deterring her from school idolhood. She opts for pants and shorts, concealing self-doubt until friends encourage her to perform in a dress during a pivotal concert—a transformative moment cementing her self-acceptance.

Petite at 155 cm, Rin sports short orange hair and light green eyes, her 75-59-80 frame often clad in sportswear. Born November 1 (blood type A), she craves ramen but recoils from fish. Quirky feline mannerisms—playful “nya~” speech endings, paw-like gestures—clash humorously with her cat allergy.

As lily white’s yellow/turquoise representative in µ's, Rin channels her athletic prowess into hurdling, football, and basketball, while leading group practices. Her sharp nose detects scents others miss. A mischievous tomboy, she playfully nudges Hanayo out of her shell yet fiercely protects friends. Alongside Honoka and Nico in the “san baka” trio, she strategizes to ace exams mandatory for tournament eligibility.

Rin’s arc traces a path from reluctance to resolve. Early hesitation to join µ's, rooted in self-consciousness, gives way to steadfast commitment as she supports Hanayo. Game narratives delve into her musings on idolhood, aspirations to mature into a “cool adult,” and delight in bonding over ramen. Balancing sports and performances, she cultivates confidence without sacrificing her lively authenticity.

The finale film marks her graduation from Otonokizaka, closing her chapter as a testament to µ's enduring themes: camaraderie, resilience, and the power of community to transform doubt into triumph.