Kogoro attends his alma mater and takes Conan, Ran, and Sonoko with him. A university student named Sonsaku Tsujiei asks Ran if she could examine how realistic their corpse is and guides her along with Conan and Sonoko through a haunted house production hosted by Tsujiei and his three friends. Inside the set, Anna Tadami dies after convulsing on a table. The police conclude it to be suicide after finding a cyanide capsule in her mouth and her past obsession with death. However, Conan points out that marks on the victim's face revealed an unknown assailant forced Tadami to bite into the capsule allowing the police to consider the possibility of murder.
