When a strange incident sweeps through the city, Anna and her friends open a fresh investigation. Their search takes them to a dreamlike location called Karin's Garden, where new clues surface and long-kept secrets start to emerge. The Star Detective Precure team has to cooperate to find out what really happened. This magical girl film tells an original story made for the big screen and brings in a crossover with the casts of You and Idol Precure♪ and Wonderful Precure!.