Crayon Shin-chan: Make the Wind and Rain! violent! The Empire Strikes Back

On this day, near Kasukabe where Xiaoxin lived, a new amusement park called "20th Century Expo" suddenly opened. Old TV shows and movies from the 20th century are played everywhere in the amusement park. Here, everything is a replay of the past. Every adult who comes here is immersed in the old days, but for children, these things are not interesting at all. What Xiaoxin never expected was that his parents who entered the amusement park didn't care about anything else and just kept indulging in the past time. All the adults in the city went in, only the children were left! Whose conspiracy is this? Can Xiaoxin and the others smash this conspiracy?