The long-awaited Bloom Garden Party is finally about to take place. This is the stage that Kaho Hinoshita and the other members of the Hasu no Sora Girls Academy school idol club have been working toward for an entire year, a place where everyone can bloom. It represents the fulfillment of a promise made with the graduates on that day long ago, marking the arrival of a long-cherished dream. Yet, this momentous day also carries a bittersweet weight, as it is the very last day that the members of the graduating 103rd class can spend together as students of Hasu no Sora. Despite the impending farewell, the girls pour all their energy into racing through their youth.

The film serves as a culmination of the story from the Link! Like! Love Live! smartphone app, following the members of the school idol club as they approach graduation. The central characters include the earnest Kaho Hinoshita, her fellow club members such as the determined Sayaka Murano, the elegant Kozue Otomune, the enigmatic Tsuzuri Yugiri, the cheerful Rurino Osawa, and the spirited Megumi Fujishima, among others from the 103rd and 104th classes. The setting is the historic Hasu no Sora Girls Academy, a prestigious school with over a century of tradition, located on the shores of a lotus-filled lake in Kanazawa, Ishikawa Prefecture.

The central narrative arc focuses on the realization of the Bloom Garden Party event itself, a large-scale performance that represents the culmination of their dreams and struggles. This final day together becomes the stage where the 103rd class members confront their own growth, the bonds they have formed, and the legacy they will leave behind, striving to make their shared story a success even as their time together draws to a close.