Reinya may seem like a regular girl handling a convenience store job, but she leads a double life as the Phantom Thief Reinya. With her trusty assistant Chuutarou, Reinya orchestrates heists for gold treasures from their hidden lair beneath the store. Their schemes are constantly challenged by a bumbling trio from the nearby police station: a lecherous inspector, a clueless policewoman, and a detective smitten with Reinya.