The detectives of Milky Holmes traded their mystery-solving for idol management, and the show knows exactly how absurd that is. Comedy runs on the collision between their genuine incompetence and their unshakeable confidence. When someone starts stealing idol songs, these washouts become the only people desperate enough to actually care about solving it.

The Great Era of Detectives, when detectives and thieves wielding powers called Toys faced off, has given way to the Great Era of Idols. In Yokohama, someone has started stealing songs from idols. When super idol Marine Amagi loses her hit song "Kiseki no Uta" to the thief, she asks the detectives of Milky Holmes to take the case. The series is a comedy mystery built around their investigation.