Akechi Anna is a 14-year-old second-year middle school student living in Makoto Mirai City!. Guided by a fairy named Pochitan who appeared on her birthday in her room with a pendant, she travels back in time from 2027 to Makoto Mirai City in 1999...!.There she meets Kobayashi Mikuru, a 14-year-old girl who dreams of becoming a star detective!. Suddenly, an incident occurs!? It appears someone is in trouble after something important was stolen...? Could this incident be caused by the Phantom Thieves...? We can't ignore people in trouble...!. With that thought in mind, Anna and Mikuru transform into the Star Detective Pretty Cure!. The Star Detective Pretty Cure will protect everyone's smiles with the power of deduction. Solve that mystery. Cure It!. And will Anna be able to return to her original time period...!?