"Eiga Jewelpet Sweets Dance Princess" is a film adaptation within the Jewelpet franchise, blending magical girl elements with themes of friendship, perseverance, and self-discovery. The narrative centers on Ruby, a cheerful and determined Jewelpet, and her human partner, Rinko, as they embark on a journey to save the Sweets Dance Princess Contest, a prestigious event in the magical world. The contest, which celebrates the art of dance and confectionery, is threatened by an unexpected disruption caused by a mysterious antagonist seeking to undermine its purpose.

The story unfolds as Ruby and Rinko, alongside their friends and fellow Jewelpets, work to uncover the source of the disruption. They discover that the antagonist aims to exploit the contest's magical energy for selfish gains, endangering the harmony of both the human and magical realms. Through teamwork and determination, the protagonists strive to restore balance, emphasizing the importance of collaboration and trust. Along the way, they encounter challenges that test their resolve, including mastering new dance routines and creating magical sweets infused with positive energy.

Key characters include Ruby, whose optimism and creativity drive the group forward; Rinko, whose growth as a dancer and leader becomes a focal point; and the antagonist, whose motivations are gradually revealed, adding depth to the conflict. The film also features a supporting cast of Jewelpets and humans, each contributing unique skills and perspectives to the mission. The narrative culminates in a climactic performance at the Sweets Dance Princess Contest, where the protagonists' efforts to harmonize dance and magic ultimately thwart the antagonist's plans, reaffirming the values of unity and perseverance.