With the ensemble contest behind them, the members of the Kitauji High School concert band now aim to win a gold medal at the national competition. For third-year club president Kumiko Oumae and her friends, it is their last chance before graduation. Filled with anticipation and anxiety, Kumiko worries if she can successfully lead the band. Amid her struggles, Kumiko encounters transfer student Mayu Kuroe. From her gentle demeanor to her talented euphonium skills, Mayu was a member of the Seira Girls' School concert band—a regular at nationals. While Mayu is friendly, Kumiko cannot help but have an indescribable feeling from their meeting. As new members arrive and plans are set in motion, the club, with an insatiable hunger for a gold medal, learns what it truly takes to propel themselves to reach the national level.

Everyone yearns to find their true purpose in life. This is also true for Nina Iseri, a 17-year-old girl looking to enroll in a good university, but the world always seems to work against her. On her very first day in Tokyo, she gets lost, ignored, and locked out of her new apartment. However, an unexpected opportunity arises when Nina meets Momoka Kawaragi, one of her favorite guitarists. After Nina joins Momoka for a street performance, Momoka decides they should start a band together. While Nina initially hesitates, her determination grows as they start acquiring more bandmates—the beautiful drummer Subaru Awa, the aloof keyboardist Tomo Ebizuka, and the intelligent bassist Rupa. The five girls face challenges both in the music industry and within themselves, but their shared passion for music never lets them give up on their dreams.

Mahiru Kouzuki, a skilled artist, gives up on her passion after her elementary school classmates ridicule her colorful jellyfish mural. Several years later, upon encountering an unexpected admirer in Kano Yamanouchi—a former idol with a troubled past—Mahiru decides to pursue her childhood dreams once more. Tasked with designing the mascot for Kano's new music project, JELEE, Mahiru enlists the help of her childhood friend and professional streamer Kiui Watase to make JELEE's first music video. Together with Kim Anouk Mei Takanashi, a pianist and fan of Kano's work as an idol, the girls aim to turn JELEE into a global hit. However, if they want to succeed in this ambitious endeavor, they will first have to free themselves from the shackles of their pasts.

As the Love Live! Competition draws to a close, Kanon Shibuya takes an offer to study abroad and bids farewell to her friends and fellow members of the school idol group Liella!. Although they will live on opposite sides of the world, both Kanon and the group remain motivated to continue their idol activities. Unbeknownst to Kanon, however, her plans are cut short by Wien Margarete's parents, who request that Kanon remain in Japan for another year so that their daughter can learn from her. While Kanon finds herself in awkward limbo, Wien cannot bring herself to join her once fierce rival Liella! and decides to start a group of her own. Not wanting Wien's determination to go to waste, Kanon joins the new group, recruiting her former group member's sister Tomari Onitsuka in the process. As the newfound unit strives to wash off Wien's controversial past, the new Liella! is also wrestling with the struggles of losing their irreplaceable center.