What are the incredible things about Conan's trip to Hiroshima Palace Island?

Conan and his party went to Hiroshima (it should be said that Richard Moore was invited to Hiroshima as an actor of the Japanese TV Tourism Festival). One of the staff involved in the production suddenly had a stomachache, and then something strange happened to the crew. Incredibly, what happened is a legend, attached to the "seven incredible mountains" and there are suspicious people asking the actors everywhere. It turned out that the murderer was Mr. Kitamura, who pretended to be sick at the beginning. His motive was to hide his illegal operation of the casino.