High school student Shinichi Kudo (Junpei Mizobata) and childhood friend Ran Mouri (Shiori Kutsuna) are private detectives.

Right after they leave a nail salon on the first floor of a mansion they hear a man screaming. When Shinichi and Ran arrive there, cameraman Yuhei Tsubouchi (Akira) and an assistant lie on the ground bleeding. The owner of the house and model Momoko Aida are dead.

The investigation begins. The cameraman's assistant testifies that he was by an iron-bar by a man who came from another room. Yuhei, who is Momoko's brother-in-law, asks the detectives to catch the criminal. A puzzling aspect about the case is that the criminal used an iron-bar, but the model was strangled to death. Can Shinichi uncover the truth?