On her 14th birthday, Anna Akechi encounters a magical fairy that unexpectedly sends her back in time from 2027 to 1999! In this vibrant past, she meets Mikuru, an energetic girl with aspirations of becoming a detective. As strange thefts spark tales of the Phantom Thieves, the duo becomes Detective Precure, harnessing their bravery, cleverness, and bond to crack cases and unravel the mystery behind Anna's time-traveling adventure.