The story portrays a transition from the Golden Age of Detectives, where those equipped with "Toys" fought as detectives and robbers, to the Golden Age of Idols. However, the stealing of hit songs by famous idols in Yokohama still raises suspicion. Marine Amagi, a renowned superstar, enlists the aid of the Milky Holmes detectives after her number one single "Kiseki no Uta" (Song of Miracles) is pilfered.