"Eiga Dokidoki! Precure Mana Kekkon!!? Mirai ni Tsunagu Kibō no Dress" is a feature-length anime film set within the "Doki Doki! Precure" universe, focusing on the protagonist Mana Aida and her fellow Pretty Cure warriors. The story begins with Mana, a high school student and leader of the Precure team, experiencing a vivid dream about her future wedding. Upon waking, she finds herself in an alternate reality where she is engaged to a mysterious man named Prince Shido, a character unfamiliar to her. This reality is orchestrated by the villainous organization Ledger, which seeks to manipulate Mana’s emotions and disrupt her connection to her friends and her role as a Precure.

As Mana navigates this fabricated world, she encounters her friends—Rikka Hishikawa, Alice Yotsuba, Makoto Kenzaki, and Aguri Madoka—who have also been affected by Ledger’s schemes. Each of them struggles with altered memories and identities, making it difficult for them to recognize their true bonds. The narrative explores themes of identity, friendship, and the power of hope as Mana works to restore her friends’ memories and uncover the truth behind the illusion. The film emphasizes the importance of staying true to oneself and the strength of collective resolve in overcoming adversity.

The climax involves a confrontation with Ledger, where the Precure team must unite to defeat the organization’s plans and restore their world. The resolution highlights the enduring nature of their friendship and their commitment to protecting the future. The film concludes with a reaffirmation of the team’s mission to bring hope and happiness to those around them, tying back to the central themes of the "Doki Doki! Precure" series. The story is structured to appeal to fans of the franchise while providing a self-contained narrative that explores the characters’ emotional depth and their unwavering dedication to their cause.