Girls band member Hagie is murdered at a studio. Her bandmates Someka, Tadako, and Rumi are the suspects. Megure learns hagie often fought with other bands and believes someone outside the band may have committed the murder. After listening to the stories of the three women, Conan checks the video of their band practicing. Conan, Sera, and Amuro close in on the truth after watching the video. Later, they realize why the string-like weapon used to kill the victim hasn`t been found in the studio and determine the identity of the killer and the surprising trick they used...