Dokidoki! Pretty Cure the Movie: Memories for the Future (2013)
One day, Mana Aida receives a wedding dress from her mother and grandmother that they had worn in the past. While thinking about who she would wear this beside someday, a mysterious man named Marsh appears, and Mana is thrown back into the past. She was happy to see her grandmother she loved and her old dog Maro, but she then realizes that Alice and Rikka aren't there because memories have been altered. In order to save precious memories, the future, dreams and hope, Mana transforms into Cure Heart.
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Reviews
Nice effects though.
It's entirely possible that sending the audience out feeling lousy was intentional
This is a small, humorous movie in some ways, but it has a huge heart. What a nice experience.
This is one of the best movies I’ve seen in a very long time. You have to go and see this on the big screen.