Cosmetics company president Sashihara is strangled to death in the women`s clothing store of the department store Conan and friends have come to. Sashihara leaves a dying message using her left and right hands. Inspector Megure decides to question store employee Nanbu, customer Nitsuka, and Sashihara`s employee Yamaki. Later, the forensics team discovers scissors, tape, and a straw in the trash can near the crime scene. Conan and Sera have determined the killer`s identity, and a conversation with Sonoko and Ran gives them the hint they need to know how the killer entered the victim`s changing…