Conan and friends come to Osaka when they are invited to the new building completion commemorative movie "Kaiju Gomera VS Kamen Yaiba" announcement event. During the announcement, the talented producer Yonekura is found accidentally crushed to death beneath a giant kaiju figure in a storage room. The rope supporting the figure was cut by a knife, and Osaka police inspector Otaki proceeds with his investigation of the incident as a murder rather than an accident. The suspects are narrowed down to Yonekura's subordinate producers Kosugi, Mihara, and Kouchi.