Setsuna Yūki, a third-year Nijigasaki High School student and school idol club member, conceals a hidden role as the student council president, initially separating her leadership duties from her idol persona to prevent conflicts. This dual life sparks tension as her obligations clash with her fervor for performing, fueling internal conflict over balancing her responsibilities. Driven by a desire to inspire others after witnessing the influence of past Love Live! groups, she adopts the pseudonym "Nana Nakagawa" and crafts a vibrant stage identity marked by spirited performances. Her striking appearance—long purple hair accented with red ribbons—mirrors her lively energy. When her secret is uncovered, she confronts fears of scrutiny and redefines her approach, learning to harmonize her roles. Embracing authenticity, she channels her dedication to both leadership and idolcraft into a unified resolve, recognizing their potential to coexist. This evolution deepens in later seasons and the film trilogy, where she publicly claims her identity and secures the club’s future. In *Love Live! School Idol Festival All Stars*, she partners with protagonist and teammate Karin Asaka in the subunit DiverDiva, showcasing her competitive drive while rebuilding the club. The anime delves into her emotional journey, contrasting her leadership burdens with personal ambitions. The *Kanketsu-hen* films conclude her arc as she navigates her final year, striving to cement a legacy that reflects her belief in school idols as bridges between people, solidifying her commitment to responsibility and passion alike.