Mana Aida is a fourteen-year-old second-year student at Oogai First Middle School and serves as the student council president, a role she takes on with enthusiasm and a strong sense of responsibility. She is known for her bright and energetic personality, often acting on impulse to help others without a second thought. This proactive nature, combined with her genuine kindness, earns her the trust and admiration of both her peers and adults. In the film, Mana receives a wedding dress that was once worn by her mother and grandmother, a family heirloom that carries deep sentimental value. While she daydreams about the future day she might wear it, a mysterious man named Marsh appears and transports her back in time. In the past world, she is overjoyed to reunite with her beloved late grandmother and her childhood dog, Maro, but soon realizes that her close friends Rikka, Alice, and Makoto are not present, and their memories have been altered. This discovery drives her motivation to protect the past, the future, and the precious memories that connect them.

Mana’s role in the story is that of the central hero and leader of the Precure group. As Cure Heart, she embodies the theme of love, and her transformation is triggered by her desire to protect others from the threat that seeks to rewrite history. Throughout the film, she demonstrates remarkable courage and determination, refusing to let her friends’ bonds and family legacy be erased. Key relationships include her deep friendship with Rikka Hishikawa and Alice Yotsuba, her fellow Cure team members, as well as her connection to her grandmother and her lost dog, Maro, whose sacrifice plays a pivotal role in the plot. The film also explores her bond with the Precure team as a whole, showing how their unity strengthens her resolve.

Mana’s development in the film centers on her understanding of the importance of memories and the love passed down through generations. She learns to appreciate the gifts left by her family and to fight not just for her own future, but for the futures of everyone she cares about. Her growth is marked by her willingness to accept help from her friends and her ability to turn personal grief into a source of power. Notably, she achieves a special power-up form called Cure Heart Engage Mode, triggered by incorporating the spirit of Maro, the beloved pet who protected her. In this form, she wears a long wedding-dress-inspired costume and wields a bouquet that transforms into a bow and arrow, enabling her to unleash the attack Lovely Force Arrow. This mode represents the culmination of her emotional journey, channeling love and hope into a tangible force for protection. Her standard abilities as Cure Heart include transformation via the Lovely Commune and Cure Loveads, as well as attacks such as the Love Heart Arrow and the combined team attack Lovely Straight Flush. Her fighting style emphasizes speed, empathy, and a deep connection to the hearts of those she protects.