Shin-chan and his friends discover an abandoned movie theater where some sort of western film is being displayed to an empty room. Shinnosuke's friends mysteriously disappear thus making the Nohara family start searching for them at the location they were last seen. While looking for the other kids, the Noharas inexplicably find themselves taken into the movie being exhibited…
Nohara Misae
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A band of criminals want to get the treasure of the famous Treasure Island, but the key of the treasure chamber is guarded by a little kid. Then, they come to Japan and kidnap Shinosuke Nohara by mistake, who looks exactly like the little kid who has the key.
From a bleak future, Shinnosuke Nohara sends a girl named Tamiko on a mission to bring his five-year-old self to that time period right before being captured. Reaching the past, she claims to be Shin-chan's bride and takes him and his friends on a wild adventure to try to save the world to come.
Source: ANN